Hey, we are just wrapping up the first production run, but if you don't want to wait until our next sale, send me an email and we may be able to get you one sooner. Send it to: sam@mantini.co
The holes in the torque converter plate where they mount to the engine,(4 mounting holes) can be slotted, or serrated, to slightly clock the torque converter anti clockwise, then using one of the extra mounting holes secure the install.
That secondary should be reverse mounted so that it opens to the inside - that's how all atv/sxs secondaries work. It will bind up and wear the belt how you have it. I've got a CVTech Series 06 from vegas carts that I'm mounting to a polaris secondary with a big 1 1/4" belt for a polaris 900. That setup will handle that 670, but those thinner belts on the 780 comet type torque converters aren't a great solution in my opinion. You need a really solid mounting point for that jackshaft - if you ever get it to hook up and actually use the torque things break that you didn't realize could. I would modify the frame to make the engine sit flat; putting it on those blocks it's probably going to slide. Ideally I wouldn't have slotted holes, just four holes so the engine can't move. The engine plate should be removable so you can make a new one to move the engine. Anything that can fail will.
@@cowboybenwade great advice. I guess we forgot to explain it in the second half of the video. We are no longer using the engine riser plates once we decided to remove the mounting plate that came with the TAV. But reversing the secondary is something we will definitely try if it will help reduce wear.
If you don't want to wait, we may have enough material to build one more from the original presale. If you're interested, send an email to sam@mantini.co and we can discuss it.
You really need to take in consideration, the V engine turned 180* is gonna through ur Torque/ center line all that serious stuff. I’ve built a lot of bike. I would suggest w engine that big .. I would build a motor mount, that can slide/turn /even control chain tension ! This mount will bolt right up to bikes mount. Because even a small degree of pitch can massively increase performance
@@kylesyx8432 the jackshaft is actually adjustable and can slide forward and backwards. That is how we were able to have the engine slots horizontal instead of vertical.
I was so stoked about this loved every up date everything the design the whole point of the build being a big fat guy I was super intrigued but I lost interest and now seeing this it’s like bro I’ve seen a 15 year old weld a mini bike in his garage in a day legit..I get your vision but throwing money at it isn’t always gonna work bro your dad seems awesome super handy in the time y’all been waiting you could of learned to weld and saved a but load buying a welder and pipe bender and making your bike by hand and comparable with parts most people buy off Amazon and go power sports like bro this is just ridiculous
@@Lee-tp2kh Thank you for sharing your thoughts and for being so invested in our journey, it truly means a lot to us! We completely understand how the wait can be frustrating, especially when you’re as excited about minibikes as we are. That is why I want to take this opportunity to share a bit more context about what we’ve been working on and why we’ve chosen the path we’re on. Our vision at Mantini Motors goes beyond just building minibike frame kits. While creating high quality, innovative frames is at the heart of what we do, our ultimate goal is to build a brand that inspires creativity, individuality, and craftsmanship in every rider. To bring this vision to life, we’ve had to focus on establishing a solid foundation, which includes refining our systems and processes to ensure scalability and quality in everything we produce. Over the last six months, we’ve been working tirelessly to develop the most efficient way to scale our frame production while maintaining the quality we prioritize above all else. Sure, my dad and I could pick up a welder and a tube bender and knock out a few frames ourselves. But we believe in doing things the right way, not just the fastest way. That’s why we choose to work with Tom, a craftsman with over 50 years of experience. He not only tig welds our frames with unmatched precision but has also built custom fixtures, like a 360-degree gyroscope welding fixture, that ensure every weld is welded at the perfect angle, every time. For anyone familiar with tig welding, you know how critical proper angles are for consistent, strong welds. This level of precision may seem like overkill to some, but it’s a cornerstone of the quality we’re committed to delivering. Also this 670 video was actually captured a few months ago, and while it may look like progress has been slow, the reality is that production roadblocks have required us to focus our time away from content creation. However, we are proud to say that we have begun shipping out orders, and we are about to announce our next sale. This time, with a much more streamlined production process to ensure timely deliveries. We’re also working on a major update video that will give you an inside look at everything we’ve been up to throughout our production process. This includes all the challenges we’ve faced, and the solutions we’ve come up with. We’re excited to share this journey because it’s not just about building minibikes; it’s about showing what it truly takes to build something meaningful that we are proud of. We truly appreciate your patience and passion as it keeps us motivated and grounded. We can’t wait to show you what’s next.
@ hell yeah man I just hope everything works out I remember you said your whole life saving is gone to this and all the subscribers could be potential buyers and if 50 of them are it’s a nice return one your deserve man I just don’t want you to be forgotten cuz in my opinion your making the badest sickest mini bike I’ve seen and most importantly one I’ll be able to fit in and enjoy to its fullest
@ Thanks so much for the support, it really means a lot! We’ve put everything into making the MBK-1 the best we can be, so it’s awesome to hear you like the design and the idea. If you were ever interested in getting one yourself, feel free to shoot an email to me at: sam@mantini.co We may just have enough material from the first sale to build one more, so you wouldn’t have to wait for the next batch. Either way, thank you again for your support and joining our journey.
@@lindellparker3659 are you subscribed to our newsletter? If you are, we just sent out an email with an incredible opportunity for one lucky customer. If you are not, head over to our website so you don’t miss out on exclusive updates and offers.
I would take a look at the mega moto 212 pro frame to get an idea, it has a built in jack shaft which makes the chain go on the opposite side. For speed sake, I like your idea better I would've done it too. Congratulations on your marriage, I just made thirty years myself.
. It's a plate no big deal. That things a fuckin monster on a mini bike. I have a 630 Honda from an industrial pressure washer that I'm trying to make into a mini bike. Fun to see y guys already did one know I have to finish it
Use a half thick plate and add it to the other two plates. If it fits, then make a boxed in riser. I don't like the front fork tubes being so short and fit into the triple tree tubes. Use Longer fork tubes and put them into the triple trees. Offer an additional cross brace for the handlebars so it can be positioned higher up and secure the bars from spreading and turning.
What Torque converters have you used and on what size engines? This would be our first major setup like this and so any input would be much appreciated!
I run a 40 series on a 301 predator mounted to a baja warrior, the owner is 350+ and 6'8" belt last all summer and we replace for safety not because it's burnt or destroyed
Yes, luckily though because of the way we designed our jack shaft it turns out we don't even need the torque converter plate in the first place. So we cut it for no reason haha.
@@DavidJones-lw7wy We will do a proper speed test once it is done! Don't know if we will find a dyno but there are a few digital speed signs near our house.
Yes, you could mount fenders to it with some simple brackets. It comes with mounting points for fenders which will be designing and selling hopefully next year.
Do you cut the frame or the torque converter. What’s cheaper? A piece of tubing or a manufactured mechanical design? Cut the frame and reenforce it properly. You’ll never have a problem again.
Yes, we are actually going to be developing our own electric powered kit eventually. Because of the size of the frame, there's a lot of room for larger batteries, which will allow it to run for much longer.
Hi. That shock angle looks like it will be really hard on the shock bushing and shaft. I didn't go back and see how you guys came up with that angle, but my calibrated eyeball(?) tells me that you have a falling rate rear suspension, that will get softer as more weight is added or it hits bigger obstacles, rather than a rising rate suspension. Obviously, I could be way off base, but I'd hate to see you put in all of this work, just to have the angle of the shock be an issue later on. Good luck!!!
@@jimalexander9230 appreciate the feedback, we haven’t had any issues with it so far and it is a 2,000 lbs shock so it would take quite a bit of force to wear it out. Also, the MBK-1 is a street bike so the amount of large bumps would be extremely minimal if any.
I think a rakes triple tree or rake the neck just a couple degrees maybe 3°, then use a little longer forks. Be a smoother ride and better control with the longer wheel base
Great idea, we design this frame to be more of a sporty cruiser, but my dad has mentioned wanting to design a chopper version for himself and so we can definitely play around with the rake on that one.
You can buy a riser plate for any Coleman for 20 bucks that looks amazing why does Jaws look like the inside of a dehumidifier drain pan around the engine area you guys need a little Riser plate to make it look nice maybe some mini i-beams with triangles cut into them
@@mantinimotors I’d guess because you had a big launch then 3 months of silence as far as TH-cam goes. Don’t know what the situation is but some updates wouldn’t have gone a miss.
@@Yosser70 Appreciate the honest feedback. The truth is, we’ve been so busy with production that creating content was becoming a distraction. That’s why we have been sending out email updates to everyone who subscribed to our email newsletter. Also, in full transparency, most of the problem solving required working on a computer which doesn’t make for an interesting TH-cam video, but as we have started shipping out orders, we are also working on a major update video that will go over the entire production process and everything that has happened. The goal is to provide everyone with an in-depth behind the scenes look at what it actually took to build the production model of the MBK-1.
@ that’s great mate, glad you’ve got to shipping. I’m not subscribed to the news letter because lm in the uk, and honestly couldn’t afford to get one over here. My comment wasn’t meant to be a dig, I’ve followed you and your dad from the start, and want you to succeed, so it was more a reminder that people like to hear what’s happening, because that breeds confidence in your brand. Anyway, glad you took it the right way mate 👍🏻
@@dwaynejohnson6277 we want to try to see what it is like. We can always go back to a clutch and chain if it has too much torque. This is also not going yo be used for racing and so we won’t meed to give it full throttle when starting.
We should've explained in the video, once we realize we didn't need the plate for the torque converter, we were able to eliminate both of the engine plates.
Also instead of relying on a set screw to keep your handlebars true just weld a bar going across the two once you found your comfortable position. That's not like chain tension where your gonna be adjusting it every other ride. You honestly don't want to have that problem of having to align your handlebars because an allen head stripped out or worse the threads themselves. Pretty cheap tbh
Is it just me or is the modified top bar completely off about 4 inches towards the front, and actually looks absolutely unnecessary, looks like somebody is overcompensating for something
@@leadfarmer9698 There are actually a few reasons for the hump in the backbone. 1. Future gas tank that will fit within it. Kind of like those old school Harley’s. 2. More room for larger engines. The air filter on the 670 is right on top, so we need room for the filter. Also, if you check out our other videos, you’ll see how nicely a 420cc with stock gas tank fits in there. There is enough room to get a gas pump in there without crushing your hand. 👍
My thoughts? Stop teasing us so much😂 much love been following your guys’s journey and very excited for the full outcome
I just waiting for you guys to go into full production of making this MBK1 so i can place my order
Hey, we are just wrapping up the first production run, but if you don't want to wait until our next sale, send me an email and we may be able to get you one sooner. Send it to: sam@mantini.co
Excited for part 2 🤙
The holes in the torque converter plate where they mount to the engine,(4 mounting holes) can be slotted, or serrated, to slightly clock the torque converter anti clockwise, then using one of the extra mounting holes secure the install.
it's awesome your dad is just as into it as you.
@@domturiace670 my dad is the reason I’m even into mini bikes. He had me riding on one with him at the age of 2. He’s built them his whole life.
That secondary should be reverse mounted so that it opens to the inside - that's how all atv/sxs secondaries work. It will bind up and wear the belt how you have it. I've got a CVTech Series 06 from vegas carts that I'm mounting to a polaris secondary with a big 1 1/4" belt for a polaris 900. That setup will handle that 670, but those thinner belts on the 780 comet type torque converters aren't a great solution in my opinion. You need a really solid mounting point for that jackshaft - if you ever get it to hook up and actually use the torque things break that you didn't realize could. I would modify the frame to make the engine sit flat; putting it on those blocks it's probably going to slide. Ideally I wouldn't have slotted holes, just four holes so the engine can't move. The engine plate should be removable so you can make a new one to move the engine. Anything that can fail will.
@@cowboybenwade great advice. I guess we forgot to explain it in the second half of the video. We are no longer using the engine riser plates once we decided to remove the mounting plate that came with the TAV. But reversing the secondary is something we will definitely try if it will help reduce wear.
Will be waiting and saving for it to be for sale!
If you don't want to wait, we may have enough material to build one more from the original presale. If you're interested, send an email to sam@mantini.co and we can discuss it.
You really need to take in consideration, the V engine turned 180* is gonna through ur Torque/ center line all that serious stuff.
I’ve built a lot of bike.
I would suggest w engine that big .. I would build a motor mount, that can slide/turn /even control chain tension !
This mount will bolt right up to bikes mount.
Because even a small degree of pitch can massively increase performance
@@kylesyx8432 the jackshaft is actually adjustable and can slide forward and backwards. That is how we were able to have the engine slots horizontal instead of vertical.
I was so stoked about this loved every up date everything the design the whole point of the build being a big fat guy I was super intrigued but I lost interest and now seeing this it’s like bro I’ve seen a 15 year old weld a mini bike in his garage in a day legit..I get your vision but throwing money at it isn’t always gonna work bro your dad seems awesome super handy in the time y’all been waiting you could of learned to weld and saved a but load buying a welder and pipe bender and making your bike by hand and comparable with parts most people buy off Amazon and go power sports like bro this is just ridiculous
@@Lee-tp2kh Thank you for sharing your thoughts and for being so invested in our journey, it truly means a lot to us!
We completely understand how the wait can be frustrating, especially when you’re as excited about minibikes as we are.
That is why I want to take this opportunity to share a bit more context about what we’ve been working on and why we’ve chosen the path we’re on.
Our vision at Mantini Motors goes beyond just building minibike frame kits. While creating high quality, innovative frames is at the heart of what we do, our ultimate goal is to build a brand that inspires creativity, individuality, and craftsmanship in every rider.
To bring this vision to life, we’ve had to focus on establishing a solid foundation, which includes refining our systems and processes to ensure scalability and quality in everything we produce.
Over the last six months, we’ve been working tirelessly to develop the most efficient way to scale our frame production while maintaining the quality we prioritize above all else.
Sure, my dad and I could pick up a welder and a tube bender and knock out a few frames ourselves. But we believe in doing things the right way, not just the fastest way.
That’s why we choose to work with Tom, a craftsman with over 50 years of experience.
He not only tig welds our frames with unmatched precision but has also built custom fixtures, like a 360-degree gyroscope welding fixture, that ensure every weld is welded at the perfect angle, every time.
For anyone familiar with tig welding, you know how critical proper angles are for consistent, strong welds. This level of precision may seem like overkill to some, but it’s a cornerstone of the quality we’re committed to delivering.
Also this 670 video was actually captured a few months ago, and while it may look like progress has been slow, the reality is that production roadblocks have required us to focus our time away from content creation.
However, we are proud to say that we have begun shipping out orders, and we are about to announce our next sale. This time, with a much more streamlined production process to ensure timely deliveries.
We’re also working on a major update video that will give you an inside look at everything we’ve been up to throughout our production process. This includes all the challenges we’ve faced, and the solutions we’ve come up with.
We’re excited to share this journey because it’s not just about building minibikes; it’s about showing what it truly takes to build something meaningful that we are proud of.
We truly appreciate your patience and passion as it keeps us motivated and grounded. We can’t wait to show you what’s next.
@ hell yeah man I just hope everything works out I remember you said your whole life saving is gone to this and all the subscribers could be potential buyers and if 50 of them are it’s a nice return one your deserve man I just don’t want you to be forgotten cuz in my opinion your making the badest sickest mini bike I’ve seen and most importantly one I’ll be able to fit in and enjoy to its fullest
@ Thanks so much for the support, it really means a lot!
We’ve put everything into making the MBK-1 the best we can be, so it’s awesome to hear you like the design and the idea.
If you were ever interested in getting one yourself, feel free to shoot an email to me at: sam@mantini.co
We may just have enough material from the first sale to build one more, so you wouldn’t have to wait for the next batch.
Either way, thank you again for your support and joining our journey.
Can’t wait to buy one soon….. I hope.
@@lindellparker3659 are you subscribed to our newsletter? If you are, we just sent out an email with an incredible opportunity for one lucky customer. If you are not, head over to our website so you don’t miss out on exclusive updates and offers.
I can't wait for the frame to show up, I already have the dual ghost motor ready to throw in it
@@jorgebaca8526 oh that is going to be an epic build!
Pretty cool, looks like a mini V-Max
Glad you like it! And I might need to use that name if we sell a this as a production bike haha.
Great video! Personally, I'd cut the bracket, never the frame.
I would take a look at the mega moto 212 pro frame to get an idea, it has a built in jack shaft which makes the chain go on the opposite side. For speed sake, I like your idea better I would've done it too. Congratulations on your marriage, I just made thirty years myself.
Asweome build! Daily struggle... ;-) Keep going!
It will be really cool if you add a Harley’s gear box at the back you just have to extend the frame
Everybody knows you got to cut to that torque converter plate
. It's a plate no big deal. That things a fuckin monster on a mini bike. I have a 630 Honda from an industrial pressure washer that I'm trying to make into a mini bike. Fun to see y guys already did one know I have to finish it
Putting the 630 on the mini bike will be epic. Hopefully this video series will help give you some ideas on how to do it!
Use a half thick plate and add it to the other two plates. If it fits, then make a boxed in riser. I don't like the front fork tubes being so short and fit into the triple tree tubes. Use Longer fork tubes and put them into the triple trees. Offer an additional cross brace for the handlebars so it can be positioned higher up and secure the bars from spreading and turning.
All Torque converters I have just burn through belts especially when they’re on more high power engine
What Torque converters have you used and on what size engines? This would be our first major setup like this and so any input would be much appreciated!
I run a 40 series on a 301 predator mounted to a baja warrior, the owner is 350+ and 6'8" belt last all summer and we replace for safety not because it's burnt or destroyed
P.S. wish I had your dad
@@danielclements2754 Well since you are here with us on this journey, consider yourself apart of the Mantini family!
Automatic quick fix. Cut the torque converter plate. I've done it several times. 😂😅
Yes, luckily though because of the way we designed our jack shaft it turns out we don't even need the torque converter plate in the first place. So we cut it for no reason haha.
That mini bike is gonna rip!
I want one as well
The frame of my dreams
@@DavidJones-lw7wy glad you like it! What engine will you put in yours when you get yours? 😉
@mantinimotors i been studying videos of the v twin ... just got to see how much speed you coming out with
@@DavidJones-lw7wy We will do a proper speed test once it is done!
Don't know if we will find a dyno but there are a few digital speed signs near our house.
@@mantinimotors congratulations on the wedding
@@DavidJones-lw7wy Thank you!
That's a sick minibike, are you able to have fenders on it?
Yes, you could mount fenders to it with some simple brackets. It comes with mounting points for fenders which will be designing and selling hopefully next year.
Most torque converters have multiple settings to set up multiple areas
Oh yeah that’s what I’m talking about
Do you cut the frame or the torque converter.
What’s cheaper? A piece of tubing or a manufactured mechanical design?
Cut the frame and reenforce it properly.
You’ll never have a problem again.
Electric power version with that fame would be dope
Yes, we are actually going to be developing our own electric powered kit eventually. Because of the size of the frame, there's a lot of room for larger batteries, which will allow it to run for much longer.
Hi. That shock angle looks like it will be really hard on the shock bushing and shaft. I didn't go back and see how you guys came up with that angle, but my calibrated eyeball(?) tells me that you have a falling rate rear suspension, that will get softer as more weight is added or it hits bigger obstacles, rather than a rising rate suspension. Obviously, I could be way off base, but I'd hate to see you put in all of this work, just to have the angle of the shock be an issue later on. Good luck!!!
@@jimalexander9230 appreciate the feedback, we haven’t had any issues with it so far and it is a 2,000 lbs shock so it would take quite a bit of force to wear it out. Also, the MBK-1 is a street bike so the amount of large bumps would be extremely minimal if any.
@ hi. Sounds good!!
I think a rakes triple tree or rake the neck just a couple degrees maybe 3°, then use a little longer forks. Be a smoother ride and better control with the longer wheel base
Great idea, we design this frame to be more of a sporty cruiser, but my dad has mentioned wanting to design a chopper version for himself and so we can definitely play around with the rake on that one.
I’d cut the torque converter. I’ve made this modification several times without a hitch,
How much are your guys mini bikes they are badass looking man. And I'm gunna go a head an subscribe for more this is sick man!
U need a 5spd to with that 670cc to be a real bad azz
You can buy a riser plate for any Coleman for 20 bucks that looks amazing why does Jaws look like the inside of a dehumidifier drain pan around the engine area you guys need a little Riser plate to make it look nice maybe some mini i-beams with triangles cut into them
Do you have a link where I can order that front end?
We will be selling it on our website soon. (Mantini.co) As we are always looking for feedback, what do you like most about it?
Personally I would have connected those handlebars To each other With some sort of bar in between Welded So there's no chance of them turning
I would've cut it too probably 😅
Couldn't you just flip the rear tire 😅
Make production frame specifically for the engine 😅
The other thing I'm really surprised you haven't adopted some Automotive dampener like a motor mounts
That's an interesting idea which will look into once the bike is running just to see whether or not we actually need to.
Rotate clutch backing plate, redrill mounting holes. Don't hack.
I was 100% for you guys but I'm not so sure now
😂😂😂😂
@@Matt-s4y what do you mean by that?
@@mantinimotors I’d guess because you had a big launch then 3 months of silence as far as TH-cam goes. Don’t know what the situation is but some updates wouldn’t have gone a miss.
@@Yosser70 Appreciate the honest feedback. The truth is, we’ve been so busy with production that creating content was becoming a distraction. That’s why we have been sending out email updates to everyone who subscribed to our email newsletter.
Also, in full transparency, most of the problem solving required working on a computer which doesn’t make for an interesting TH-cam video, but as we have started shipping out orders, we are also working on a major update video that will go over the entire production process and everything that has happened. The goal is to provide everyone with an in-depth behind the scenes look at what it actually took to build the production model of the MBK-1.
@ that’s great mate, glad you’ve got to shipping. I’m not subscribed to the news letter because lm in the uk, and honestly couldn’t afford to get one over here. My comment wasn’t meant to be a dig, I’ve followed you and your dad from the start, and want you to succeed, so it was more a reminder that people like to hear what’s happening, because that breeds confidence in your brand. Anyway, glad you took it the right way mate 👍🏻
Repost?
Im surprised you're putting a torque converter on it. Way overkill for such a big motor. You're going to be burning rubber on every takeoff!!
@@dwaynejohnson6277 we want to try to see what it is like. We can always go back to a clutch and chain if it has too much torque. This is also not going yo be used for racing and so we won’t meed to give it full throttle when starting.
What's taking so long so i can place my order?
Please let me know.
I’d just lower the engine on one plate and put in a jackshaft for the secondary clutch
We should've explained in the video, once we realize we didn't need the plate for the torque converter, we were able to eliminate both of the engine plates.
@ gotcha I saw later in the vid you said you wanted to use your style Jackshaft so it was clarified
I would of raised it
Raise the engine would make sense.
Instead of cutting, why not just make the engine a bit off center with the frame? And the chain won’t matter because your using the jsckshsft
2:13 man just grind the torque converter. Way too much overthinking. Unnecessary
Also instead of relying on a set screw to keep your handlebars true just weld a bar going across the two once you found your comfortable position. That's not like chain tension where your gonna be adjusting it every other ride. You honestly don't want to have that problem of having to align your handlebars because an allen head stripped out or worse the threads themselves. Pretty cheap tbh
Couldve literally put a few holes around the bottom of the bar that inserts and made "positions"
Is it just me or is the modified top bar completely off about 4 inches towards the front, and actually looks absolutely unnecessary, looks like somebody is overcompensating for something
@@leadfarmer9698 There are actually a few reasons for the hump in the backbone.
1. Future gas tank that will fit within it. Kind of like those old school Harley’s.
2. More room for larger engines. The air filter on the 670 is right on top, so we need room for the filter.
Also, if you check out our other videos, you’ll see how nicely a 420cc with stock gas tank fits in there. There is enough room to get a gas pump in there without crushing your hand. 👍