Electric YZ85 Dirt Bike - Part 2
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- เผยแพร่เมื่อ 5 ก.ย. 2024
- In this video we are taking my old YZ85 dirt bike frame that I've had for years and converting it to electric. We are using a 72V 8000W hub motor and converting it to mid drive to solve the unsprung weight issue that hub motors have and installing the motor on the swing arm.
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If you want the shocks to match, move the passenger side out. It has plenty of room to be moved outwards. It'll keep your OCD under wraps.
Exactly 😂
My first thought as well
Was on my way to the comments to suggest the same thing. Just kick the right side out the same amount.
Agreed.
Absolutely, great suggestion. “It kinda looks off” translated: “it’ll drive me bat s-t. crazy every time I look ok at it.” Symmetry = Sanity
I like the suggestion below of moving the shock on the right side out so that it matches the other side.
Move the right shock out to match the one on the left. that would fix my OCD. Great progress!!!
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This guy is the most homemade creative man on the internet, imagine if everyone was like him 🔥
And his videos are cool as hell. He's not there for show or ads. Hes there for the build. Always look forward to his videos. It's usually when I go to bed so it might take me a couple of days to actually finish it. By far my favorite channel though.
I really can't wait for the hayabusa buggy (mini pro truck) to be finished. I love his frame and suspension work. The chain drives make me cringe a little, but he makes it work. 😁
But he needs to ditch the claw hammer for a brass hammer and a few ball peen's
No. He's good and I enjoy his content. But, the guy over at HOMEMADE MADNESS is probably better. The guy made a jet ski from scratch and put a hyabusa in it. His crosskart is cool as shit too. Chris is probably a better fabricator. But, this guy's projects are cooler. Ethan over at GRIND HARD PLUMBING is probably better too and definitely has cooler projects. RED BEARD'S GARAGE is also a good fabricator. I'm not sure he's better than Chris here. But, he's damn good too.
I'd like to see a big colab with him, that kid from Vasilybuilds and Taylor Ray (from the drift car community).
Please make the right rear shock symmetrical to the left. Also the idea of the controller etc being under the gutted gastank seems like a really good idea, aesthetically and rainproof wise.
The ground clearance is plenty, but I would add a skid plate.
Anyways great job, hell of a video.
Was thinking about this. I think he got so stuck into needing to move the left one that he forgot that he can also move the right one to match the left stick out
Loving this build. That asymmetry would bug the heck out of me with those shocks, though. I would probably move the right one out 'til it is more balanced with the left one spatially.
My thoughts exactly
Same
I'm here just to suggest that. Good one
Ok man, I know the motor doesn't have much leverage on the suspension but that is still unsprung weight. As I see it anyway... It probably won't affect the handling as much but still. Everything so far is unsprung weight. The dual shock setup is freaking awesome! The symmetry from the side is what people will see. The asymmetrical rear view will only be noticable by people that are LOSING! And if they are trying to pass you they might be distracted by it, also to your benefit! Regardless this is an awesome project. Also 53" wheelbase is totally fine it's not an 80cc bike anymore so it can grow up a bit. And the ginormous swing arm will almost definitely aid the handling. Look at any rocket bike historically and you'll see shorter motors front to back and longer swing arms.
So in conclusion, good job, good design, good engineering, good foresight and just a giant thumbs up to you with a high five on the side! You can stop reading this now and get back to work...
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Nothing simple about your builds. I enjoy your channel. Thank you.
when u have the tools and the machinery, it makes working on something much easier. I'm so lucky i inherited a lathe and a bandsaw. the lathe alone has saved me so much time and money. keep up the good work
I like how you framed your shots through the opening in the frame- simple little thing, but allows you AND the bike to be seen when you are explaining things to us. Kudos!
You should do an episode of fixing up the shop to be more solid. Now that your welder is out there, you can make solid structures for your hoists, braces, tube bender, etc.
I wish he would do some kind of fundraiser. I really think he could build a real shop.
Almost nothing impresses me more about your show than how you are able to build almost anything using bricks and chunks of wood to hold your work.
Great work! keeping the motor on the swing arm but near the pivot is ideal! chain length stays the same and you could even make a box around it.
from a conceptual point 1 shock >> 2. its hard to get springs or dampers to match. Yamaha was the first to have single spring rear suspension and dominated offroading with it. cars have a hell of a time being symmetric without adjustments.
Chris, don’t worry about symmetry, this is a prototype. You can do pretty and symmetrical, later…move forward!
I really enjoyed this second part of your electric YZ85 build. The bike looks and sounds amazing. Thanks for sharing your build with us!
I would think if you could mount the motor on the opposite side of the frame from the back wheel, it would lesson the unsprung weight of the wheel and create no added unsprung weight. The way you have it adds a lot of weight to the swing arm.
I watched you at the beginning of the build and thought OMG this Lad likes making things hard, why is he not using the Old frame, then I see you did THIS IS A SUGGESTION START COLLECTING OLD PUSH BIKES YOU WILL FIND THERE IS A LOT OF GOOD METAL TUBING AND ANGLES ON THEM
SAVE A LOT OF MONEY WHEN BUILDING YOUR PROJECTS
Awesome project, If you still have the engine, the other way to do this conversion is to install a motor where the magneto normally goes and rip the conrod, piston, cylinder etc out, and drive the crank from the electric motor, you can then still have access to all the gears, or another way to do this is make the motor shaft of the one you have the actual swing arm shaft giving you good geometry and reducing space required and still giving you a fixed chain tension.
I was wondering when you were going to be on again . Then I see the Notification “ALRIGHT “ lot of people already took my comment on the shocks but it s your build . That front end is going to be so light that you’ll need to add Suitcase Weights 😂 thanks for letting us sit and watch you build sure wish you were on longer
It’d be a good idea to place the motor at the pivot point of the swing arm to reduce the weight and save space. Also will ride better without the weight on the swing arm
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I really like the two shocks, personally I think it looks badass with a shock on each side I wouldn't change a thing
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Can't wait to see how much power this has 🙌. Interesting build for sure!
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What your thinking of is Delrin, it’s a hard plastic. Comes mainly in rod form, I use it all the time making parts for my PCP Airguns
You should see my homemade 50 cal pcp.
I can't wait for part 3. I'm in the process of building an enclosed under seat steering recumbent scooter.
I’ve not been a fan of any of your electric vehicle builds, but do like the way this one is going.
Really wanting to see a road based cross cart build like the Sierra karts. Love to see how you go about building something with adjustable suspension at all points. Challenge
Love the two springs looks super cool.
I love what you're doing here but I think I'd move the right side shock to the outside to match mirror the relative position of the one on the left. With that said, over-all, I think it's great and I always enjoy seeing what you come up with.
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I think it's a good idea overall.
However, if the motor is mounted on the swing arm and receives the impact as it is, the shaft may be damaged. Also, by releasing the left and right connection of the swingarm pivot, the lateral rigidity will decrease, which will affect the handling. Also, if you don't think about the center of gravity, the rear tires will wobble and become unstable.
I wish this project every success.
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Counter lever suspension is what you need like an old xs400 , use the original mount at the top and run a hoop over the motor so you also gets mechanical advantage making the shock harder and use the original shock wound be better
I was gonna say gut the tank for the electronics. That's a really good idea.
Probably too many comments for you to get to this one but you could attack your symmetry issue by going old school Yamaha. Look at the late seventies IT and YZ bikes where the first use of a mono-shock was more horizontally oriented. Fab a hoop across the swing arm over the cross brace high enough to give you clearances for twin shock mounts to clear chain and not interfere with e-motor. Brace that loop on both sides from the rear on the swing arm. You can then get some symmetry back and maintain travel if you forward lean your shocks. Added benefit is that you will spread out the weight load of the rear shock lower mount over a larger area on your extended swing arm. Mock it up, tack it and see if you can achieve reasonable sag with the shocks on hand. Look at from the perspective of mounting two "mono-shocks" on the rear swing arm with lower perches elevated enough to give you your clearances. This will add more sprung weight to the rear, but it might be functional as well as cool looking...just a thought. Keep up the great content!
It would make a lot more sense to just buy a QS138 since it fits that 85cc frame. This is a lot of extra work to have less performance and extra weight. I certainly appreciate your creativity and hard work!
That would be buying another thing he's reusing the MTN bike build
Quit being a bigot and just buy some creative talent. Go shine your light on some other dove 😂
Best Mark Normand impersonation ever.
22:54 Reminds me of the early 1980’s Husqvarna dirt bike suspension setup.
now that’s looking sturdy…a solid good feeling when riding it, this build is looking good!
Bad ass build, but dude!!! Offset the shock that is more inwards to accommodate the shock that must be mounted more outward so they’re symmetrical 👊
Chris.. while watching the Shock part of the episode.. and you moved it to the right… I was two…? Then you put two on there!! And a lil asymmetric quality work there!
Most talented dude I know on TH-cam
This is my favorite project I'm can't wait to finish and of course final shape
I'd make a hoop that goes over the chain between the motor and wheel, then mount the shocks perfectly in line
Gonna be the 1st Silent Mid Drive 🤟👽🚲🎬
The gyroscopic effect of that motor on the handling of the bike will be interesting. 🙂
The shocks are good one inch is nothing to worry about I am glad you put two on as just one on the side wouldn't have worked the frame would have twisted and jammed up plus it looked awful now it looks great as an old saying goes a blind man would like to see it, This moto x bike is going to turn out awesome and I reckon it's going to have a load of power so have plenty of fun on it once it's done as your creations to me are brilliant as you listen to people who give you constructive ideas and you carry them out as you are such an awesome welder/fabricator and machinist I have ever seen so good luck Chris all the best from John from Rugby UK.
Move the right side shock out to match where the left had to be placed. I like symmetrical too!😊
Love your builds and channel, but please do us all (yourself included) a favour and get those shocks symmetrical haha. Good stuff man.
For those small tolerance changes/differences; try Loc-Tite Retaining Compound (Green). Fills in those small spaces. Stuff is amazing.
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Don't worry about it not being symmetrical. all bikes are built un-symmetrical. Well, I owned over 300 by 1993, and none of those were, before and after some crashes 😀
Move the right one out the same as the left one and that will fix the goofy look from behind. Keep up the good work 👍
For the left side shock why not mount it above the chain with the mount going around the chain down to the swing arm then you'd just have to mirror the same mount for the right side shock. It would only lift the shocks up a couple inches then you'd have it perfectly symmetrical
looks way better with dual shocks
Maybe for the rear suspension, instead of mounting the shocks right on the arm, you could use a set of push-arms and mount the shock(s) further in the frame, like some mountain bike with rear suspension does? This would make it more symetrical, and can increase the efficiency of travel and maybe event render one shock sufficient.
Nice projet so far! Way better than the previous bike already!
Yes l was thinking like that and maybe use just one strong spring suspension rather than two
In my opinion, i recommend that the motor is mounted on the frame. In order to minimize the vibration of the swing arm 😊
Thank you for editing out the loud stuff
I'm saying that if you didn't figure out the problem on the big dirt bike (the problem with the motor) try to switch the green wire with the yellow one on the controller Love your content bye🔥
I would have moved the right rear shock out to maintain the look and balance the stresses applied to both sides of the frame when landing from jumps etc... It looked like there was nothing limiting how far out the shock could be moved and it would appear that it would allow more clearance for wiring and splash guards later so it might be worth cutting back off now to modify before final welding.
I hope you incorporate the gas cap into something. Like a charging plug under the gas cap or something like that. Just a thought. Bike is looking great btw. That swingarm is tight. Great work.
7:34 make the chain longer and put a swing arm with a spring pushing up, with the pivot point where the brick is, and the reach such that the chain wraps around the rear gear. You'll have more chain on the gear that way and it pulls it out even more.
23:17 could also use cantilever arm suspension, placing the shocks where the gas tank would be with the reservoirs downwards. That way, there's only a rod in the rear, not the whole shock.
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Just food for thought....
1 I'd do dual shock old school
2 I'd make the battery pack so it's fitted to the frame instead of a square block that don't look right
3 I'd get a new gas tank and use it as a water bottle for when out on adventures
then you don't need to carry camel pac 😉
I think i would just move the right hand shock over to match the left one, but still its an awsome build!!
You make a beautiful car, my friend, I wish you good health, you are always worth creating
f you want the shocks to match, move the passenger side out. It has plenty of room to be moved outwards. It'll keep your OCD under wraps.
For this project it would be better a inrunner motor, they are much smaller and are used for positioning like you did. What you have there is an outrunner that is used to be inside of the wheel itself. If you had the motor then it's ok but inrunners are better for this type of setup, they are much smaller.
I think it’s about time for a hydrologic adjustable table save your back we need you in good working condition love and appreciate what ever you do
It is just so fun watching you build.... tho is make me want to get a proper workplace myself
Have a look at Yamaha's original Monochock set up, it has a hoop on the rear swingarm and the shock is at a very similar angle as it would be on your bike if you used the original mounting point. :)
I personally like the offset shocks. It is just form following function.
It would be cool to see 4 of those motors powering a go kart axle.
Twin shocks was definitely the right choice but just move the right one out to match the left one and it will look fine
Just so you know, you can buy stiffer springs. That also costs a lot less than adding multiple shocks
I think this huge motor of yours will be way better than any mid-drive motor mate. Let people may mock you man it's actually a genius idea as the motor has a shed load of torque, it's design to turn something the size of a wheel, by putting that little sprocket on there you've increased the torque big time, you've more than doubled the torque of that motor, tripled maybe 👍🏼
A longer suspension arm would give you better stability, this monster will probably want to throw you off the back 🤣 live for the danger 🤣👍🏼
Amazing wrk as usual. Gonna be pretty cool when done.
on a begining i thought it would be like eleek pozitiffmd. i was wrong, cool build
Someone is going to try to hire you and put you in charge of 'R & D' of some innovative electric dirt bike company. I feel it in my bones!
Awesome channel. Everything stops when a new episode appears.
The bushing material used in racing is fairly stiff, its an acetal plastic called, Delrin. A material offering more give, or compliance, is Polyurethane.
edit: A possible solution to your shock symmetry problem...
Weld a riser on the lateral cross bar of the swingarm that allows a shorter, more modern uni-shock to clear the motor housing, w/ the upper mount attached as required... symmetrically.
Well, you could take the right-side shock and move it outward to match the chain side shock.
Make a bottom shock bracket that comes up on the outside of the swing arm on both sides with a bar across them higher than the chain. Like an upside down U.
Great work! The frame looks like it came out of the factory. :)
Un mecanic si un sudor pasionat, mult succes..Bravo.
Instead of remaking the swing arm bushings try deforming the outer side a little with a hammer and you would be surprised how easy it is to make the bushing fit perfectly again. Have had to do that a few times in the past 👍
Dude! I got the same exact band saw! Right on, keep up the good work.
I really wish youd come check my mid hub build out,,,, no you dont need the nuts anymore, its not looking terrible lad,,, cracking fabrication as usual,,, move the right shock out to match the left tho😉
Amazing job well done, what a lovely good young man you are , Great work on the bike build, Thanks for sharing the video with us👍👍👍
A dogbone off the crossbar between the tire and motor to a backward facing bell crank . So a single shock running parallel to the swingarm up top under the seat perhaps?
At this point it looks like it's a hub motor electric motorcycle with the hub divorced from the rear wheel. It doesn't seem like there will be much advantage. Maybe unsprung weight because of the leverage of the motor being closer to the swing arm pivot, and the shocks. It would be cool to see the difference between this one and an actual hub mount one.
I am loving the look of this thing and I can't wait to see it riding... It looks so mean w/ those dual shocks too, like it wants to dig a trench every time you hit the throttle. ❤😁👍
Edit: You should have tried to reheat the bushings and squished them a little in the press... You might be able to do that on the swingarm so it holds itself in.
AWESOME PREMIUM SWING ARM.
That’s an interesting way to install a hub motor 😂
22:11" here's one I prepared earlier " lol
Build a hoop for the two shocks and you can place them symmetrically
That's coming along sweet !! I'd maybe make a reverse u channel over motor for suspension mount ,with some gussets, to support the back and forth motion maybe .
Only downside I can see to this is how long the shock ab ,and travel is gonna be ?!
6:28 you shoud add a" shim" inbetween the clamp bolt and the axel or Safety Washer ", Hub Retaining Clip" , better safe than sorry , this is hi torque and will work it self lose over time
very interesting idea, friend, you should emulate something like this...
you could use the gas tank as extra snack storage if the controller doesnt take up too much space inside.
Seems like the hub motor sprocket isn’t centered. While spinning the wheel by hand, it’s clear that the chain tightens and loosens, along with it virtually having up and down travel. Careful it doesn’t cause failure.
This thing is going to be bad ass
impressive fabrication!
Isn't this how Tony Stark got started eventually to make the Iron Man Suit? I swear when I watch you and Grind Hard I see Tony Stark's beginning.
you could move the right hand rear shock mount out a little to match the left side, that's how old twin shock bikes were.
No doubt Chris will figure it out 👍