I've done CVT tuning for a long time now, but I've never had and engine that made me so unconcerned about dialing it in before. I had a blast for a whole year out of tune! LOL
@@MarkSmith-rc8bx It depends on the setup. The high strung stuff with OR kits seem to require more fine adjustments. With something closer to stock, 1/2 gram may get it close. If you can log RPM, you'll be able to see if you need smaller changes by looking at how much the RPM changes with a 1/2 gram up or down.
Hi Brent. Great video.When you do the follow up CVT video, I would love to see/hear a breakdown of CVT tuning to the best of your knowledge (I consider you to be one of the best on TH-cam) My understanding of CVT tuning has expanded quite a bit since I started monkeying around with scooters 2 years ago but it still feels like trying to hit a moving target.... The relationship between rollers weighs and RPM, The relationship torque springs and roller weight and clutch springs vs. RPM are the areas that are still kind of a mystery to me and I'm sure thousands of your subscribers...
I just finished the voice over stuff for the next vid minutes ago and I have I think 3 more videos past that to take care of so I have weeks of work already before I do anything else. The CVT is yet another of those very simple things that can be incredibly complex at times. In general, I think a lot of people would be well served to compartmentalize the CVT to some degree. The clutch is off the line. It can slip initially for a bit and affect RPM, but mostly think of it as off the line and then influencing the first seconds of takeoff. Then just remember that the contra spring and rollers work with and against each other. You need a contra spring stiff enough that the belt doesn't slip. Doesn't slip a lot is possibly more accurate, because a CVT wouldn't work without slip. Too stiff and you lose power and reduce belt life. I think too many people focus on really stiff springs when they probably don't need them. Rollers/sliders just need to be the right weight to work with/against the spring to achieve the desired RPM. Don't think of heavy weights for going faster or lighter weights for acceleration as some do. Just think about heavier as lowering RPM and lighter as increasing it. The entire goal for performance is to keep RPM within the range that the engine is the strongest as much as we can. Beyond that, you can dive into a deep hole of things like belt length, belt width, shimming, drive face angles, ramp designs, torque driver angles, pulley diameters, and on and on and on. Most of the time we can do quite well focusing on the basics listed above and dealing with the more in depth stuff more or less as needed. Hope that helps a little for now at least.
@@49ccscoot Thank you Brent. That was a great explanation. I have been trying to tune in 1/2 gram (per roller/Slider) increments. I didn't realize the CVT was that sensitive. Again, thank you for your help and great videos... I continue to learn a lot from you.
Some people think it's hard to watch, but if you wanna see the deer incident : th-cam.com/video/UZjp27qhd38/w-d-xo.htmlsi=CiR0RKjU0XbuaX_L At the time of the video I didn't know I had a broken tibial plateau as well (top of the shinbone/knee).
This probably has nothing to do with the video but have you personally ever modified s veriator if so what did you do to it ive seen a couple videos of it but they didn't explain how the process went anyway i am curious how it's done if can be an if it worth it ur very knowledgeable and thought ur the guy to ask
I've cut the ends of roller paths on the outer edge to try to let rollers/sliders move out farther and open the variator more. It worked on a 139QMB to reduce RPM or increase speed just a little on the top end. I've modified stock variators a little in the past, but it's not really worth it IMO. Good aftermarket variators are nice out of the box and not usually super expensive.
I have a 10.29:1 final drive ratio (14/39 primaries). I could switch to 9.35:1 (15/38 primaries) and it may be less aggressive off the line and/or possibly pull a little better up top... but power wheelies from a roll are pretty darn fun.
Hi, have you thought about making your own dyno? It doesn't cost that much and it brings a much simpler tuning. BTW I watch every video, great job. Keep going!
Thanks. Definitely thought about it. Allegedly it doesn't cost that much, but I don't really know of local sources willing to hand over a giant electric motor or big chunk of steel cheap. Closest I came was a lawn roller, but it was old and not smooth and I questioned it's integrity. Still would have cost quite a bit to get it machined to work and it was a risk IMO.
I have considered it. I was going to cut the mounts off and weld them back about 3-4". I decided that I'd like to try lowering first and see what happens. The center of gravity is quite high on this scooter, so maybe I could make a difference that way and it could potentially be beneficial by having a smaller frontal area.
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Watched your channel for years now you have really helped with my own projects thanks bro
Thanks for watching. It's always cool to know that I'm making useful content.
I build my scooter only based on his videos 😁
Thanks for this info! Before you video, I used to believe that heavier pulley would imply slower acceleration. Congrats for this video!
I'm just loving the sound of that engine, really snappy🥰🇳🇴
A strong two-stroke is a great sound IMO. I've learned that not all people like it though.
Always thoroughly enjoy your content.
Once you understand cvt tuning, you can do so much more, kinda cool to see how just a little weight makes so much of a difference
I've done CVT tuning for a long time now, but I've never had and engine that made me so unconcerned about dialing it in before. I had a blast for a whole year out of tune! LOL
This was an eye opener... I have been trying to tune by 1/2 gram increments, at best... No wonder I am not getting dialed in
@@MarkSmith-rc8bx It depends on the setup. The high strung stuff with OR kits seem to require more fine adjustments. With something closer to stock, 1/2 gram may get it close. If you can log RPM, you'll be able to see if you need smaller changes by looking at how much the RPM changes with a 1/2 gram up or down.
Thank you for the content!
So happy to see new video!
We need a dyno video of that thing
🤦♂I was just at an event with a mobile dyno and I didn't make it over.
I'm glad to see you tuning the CVT! Good video Brent.
Thanks for the video! I have a 94cc kit as well because of your content!
Are you liking it as much as I am? I really enjoy riding this thing!
Welcome back idol 🙌
Right cause its crazy how lil bit of wind can slow u way way down .. its very frustrating lol and comical to me well the comical part lol
Cool vid. I like your methodical approach 😊
Cheers.
Thank you. You really have to be methodical if you want good results with this sort of stuff IMO.
Hi Brent. Great video.When you do the follow up CVT video, I would love to see/hear a breakdown of CVT tuning to the best of your knowledge (I consider you to be one of the best on TH-cam) My understanding of CVT tuning has expanded quite a bit since I started monkeying around with scooters 2 years ago but it still feels like trying to hit a moving target.... The relationship between rollers weighs and RPM, The relationship torque springs and roller weight and clutch springs vs. RPM are the areas that are still kind of a mystery to me and I'm sure thousands of your subscribers...
I just finished the voice over stuff for the next vid minutes ago and I have I think 3 more videos past that to take care of so I have weeks of work already before I do anything else.
The CVT is yet another of those very simple things that can be incredibly complex at times. In general, I think a lot of people would be well served to compartmentalize the CVT to some degree. The clutch is off the line. It can slip initially for a bit and affect RPM, but mostly think of it as off the line and then influencing the first seconds of takeoff. Then just remember that the contra spring and rollers work with and against each other. You need a contra spring stiff enough that the belt doesn't slip. Doesn't slip a lot is possibly more accurate, because a CVT wouldn't work without slip. Too stiff and you lose power and reduce belt life. I think too many people focus on really stiff springs when they probably don't need them. Rollers/sliders just need to be the right weight to work with/against the spring to achieve the desired RPM. Don't think of heavy weights for going faster or lighter weights for acceleration as some do. Just think about heavier as lowering RPM and lighter as increasing it. The entire goal for performance is to keep RPM within the range that the engine is the strongest as much as we can.
Beyond that, you can dive into a deep hole of things like belt length, belt width, shimming, drive face angles, ramp designs, torque driver angles, pulley diameters, and on and on and on. Most of the time we can do quite well focusing on the basics listed above and dealing with the more in depth stuff more or less as needed. Hope that helps a little for now at least.
@@49ccscoot Thank you Brent. That was a great explanation. I have been trying to tune in 1/2 gram (per roller/Slider) increments. I didn't realize the CVT was that sensitive. Again, thank you for your help and great videos... I continue to learn a lot from you.
@@MarkSmith-rc8bx Read my other comment about the CVT sensitivity.
Try to get your hands on the Stage6 R/T 100FL 😁 was made for thr Rc-One case and gives 40hp to the wheel !
Dang u hit a dear .. on a scooter? That must have been rough man im glad ur alright dude
Some people think it's hard to watch, but if you wanna see the deer incident :
th-cam.com/video/UZjp27qhd38/w-d-xo.htmlsi=CiR0RKjU0XbuaX_L
At the time of the video I didn't know I had a broken tibial plateau as well (top of the shinbone/knee).
This probably has nothing to do with the video but have you personally ever modified s veriator if so what did you do to it ive seen a couple videos of it but they didn't explain how the process went anyway i am curious how it's done if can be an if it worth it ur very knowledgeable and thought ur the guy to ask
I've cut the ends of roller paths on the outer edge to try to let rollers/sliders move out farther and open the variator more. It worked on a 139QMB to reduce RPM or increase speed just a little on the top end. I've modified stock variators a little in the past, but it's not really worth it IMO. Good aftermarket variators are nice out of the box and not usually super expensive.
Ok that the motor I have
what gear ratios are you runniing?just out of curiosity
I have a 10.29:1 final drive ratio (14/39 primaries). I could switch to 9.35:1 (15/38 primaries) and it may be less aggressive off the line and/or possibly pull a little better up top... but power wheelies from a roll are pretty darn fun.
Hi, have you thought about making your own dyno? It doesn't cost that much and it brings a much simpler tuning.
BTW I watch every video, great job. Keep going!
Thanks.
Definitely thought about it. Allegedly it doesn't cost that much, but I don't really know of local sources willing to hand over a giant electric motor or big chunk of steel cheap. Closest I came was a lawn roller, but it was old and not smooth and I questioned it's integrity. Still would have cost quite a bit to get it machined to work and it was a risk IMO.
2:26 How is he holding it still to tighten and loosen?
Stage6 clutch tool...
www.scootertuning.ca/en/clutch-variators/39003-holding-tool-stage6-clutch-bell-universal-4051272249587.html
Do Yamaha ray zr 115cc have a speed limiter
why not try and make a mount that pushes the engine back about 10CM to lengthen the wheelbase
I have considered it. I was going to cut the mounts off and weld them back about 3-4". I decided that I'd like to try lowering first and see what happens. The center of gravity is quite high on this scooter, so maybe I could make a difference that way and it could potentially be beneficial by having a smaller frontal area.
My scooter looses power going up a hill I usually can climb and also wen I add another person on it.
I want a 94cc 2 stroke
Talk to the folks at ScooterTuning! 😁
@@49ccscoot I will, thanks for that information .
I'm diving into my RC1 CVT tuning this weekend my Dragy just arrived yesterday :-)
Nice! There's more CVT content coming, so stay tuned. Good luck with it. The dragy is an amazing tool.
@@49ccscootI always appreciate your content 🙂
🔥💯🚀🛵💯👌