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Post by Silar on Sept 18, 2015 13:19:16 GMT -5
I'm at a point now where I have pretty much tuned everything on my scooter to the best I can. It really does run like a champ and I've had it up to 52mph GPS verified flat surface (which is hard to find around here).
The only issue I have with it is going up hills. Now that I've rode it quite a bit, I can tell that the clutch is staying engaged and not returning when I start slowing down going up a hill. A while back I installed a Hoca 1k contra spring and I'm thinking that I may need to up it to 1.5k or 2k so I get the clutch to return the way (in my mind) I would expect.
Any thoughts?
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Post by jkeney on Sept 18, 2015 15:17:35 GMT -5
I would like to know this too.
I lose quite a bit uphill and I have 6.5 g rollers.
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Post by 90GTVert on Sept 18, 2015 16:31:00 GMT -5
I would try lighter weights first and see how it does, then move to a stiffer contra if you don't get the results you like. Especially if you happen to have any lighter weights around. Depending how bad the speed loss is, it could just be that the hill is too much. Even with big bore kits, we don't have an abundance of power.
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Post by Silar on Sept 20, 2015 10:27:51 GMT -5
I would try lighter weights first and see how it does, then move to a stiffer contra if you don't get the results you like. Especially if you happen to have any lighter weights around. Depending how bad the speed loss is, it could just be that the hill is too much. Even with big bore kits, we don't have an abundance of power. Thanks Brent. I've tried 5, 6, 7, and 8 gram sliders and rollers. I'm running with 8 gram sliders right now because the lighter ones seem to cause too high RPM (at least for me).. My wife's Yamaha Vino 4T unmodified even beats mine up hills. Also, I noticed that when I'm slowing down, the RPM's will sometimes hold until I'm almost stopped, then it will drop, almost like something is hung up. This has happened with both my original variator, and my new performance variator, which leads me to believe that maybe my clutch is hanging up somehow which may actually be causing my problem. I still have the original clutch in, but have replaced the variator, and the belt with a Gates kevlar belt. I may just buy a new clutch. That's the one thing I've been thinking about getting anyways, and that way I can make sure everything is good. I've seen your videos (thanks very much for them!) and I'd rather just get a new one to avoid any other problems I may run into. |
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Post by 90GTVert on Sept 20, 2015 16:54:10 GMT -5
I'd consider cleaning and regreasing the torque driver if that has not been done recently. Then the contra spring.
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Post by Deleted on Sept 20, 2015 17:25:11 GMT -5
This is interesting to me as I was going to post to ask about it also. When i first got my scoot, the belt (4,000 miles) variator and clutch and contra seemed weak so I replaced them all and did some tuning. It used to run up to a low rpm and then build in rpms as I sped up until it was screaming at 40 mph indicated. Now, with everything new I think it does what it was designed to do. With 5 gram sliders, it goes up to a good rpm and stays there during the entire acceleration process. I don't have a tach, just going by ear but it is very steady. What I did notice is that when I let off the throttle at say...35 mph, it decelerates like you are in a low gear. This continues down to about 5 mph then it rolls free. I just figured this was the way a cvt was supposed to work and thought nothing of it until I read this post above. So, are cvt's not supposed to do this? Anything above 5 mph it sounds like you downshifted when you let off the throttle. Bill |
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Post by Silar on Sept 20, 2015 20:25:15 GMT -5
I'd consider cleaning and regreasing the torque driver if that has not been done recently. Then the contra spring. Honestly, I've not given the clutch any love at all since I've had the scooter, and I doubt the PO did either since it was in such poor condition when I got it. I may go ahead and clean and re-grease just to see how that does.. |
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Post by 90GTVert on Sept 22, 2015 6:52:41 GMT -5
This is interesting to me as I was going to post to ask about it also. When i first got my scoot, the belt (4,000 miles) variator and clutch and contra seemed weak so I replaced them all and did some tuning. It used to run up to a low rpm and then build in rpms as I sped up until it was screaming at 40 mph indicated. Now, with everything new I think it does what it was designed to do. With 5 gram sliders, it goes up to a good rpm and stays there during the entire acceleration process. I don't have a tach, just going by ear but it is very steady. What I did notice is that when I let off the throttle at say...35 mph, it decelerates like you are in a low gear. This continues down to about 5 mph then it rolls free. I just figured this was the way a cvt was supposed to work and thought nothing of it until I read this post above. So, are cvt's not supposed to do this? Anything above 5 mph it sounds like you downshifted when you let off the throttle. Bill The clutch should be engaged most of the time you're in motion. It spins so fast once the CVT starts shifting that it's not going to disengage till the CVT is back at or near the starting/idle gearing. Some will disengage sooner than others depending on the exact setup, but if you're at cruising speeds and let off, it's not supposed to just return to idle. |
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Post by Deleted on Sept 22, 2015 18:42:03 GMT -5
Excellent Brent. Thank you. Then it sounds as if mine is working as designed. I appreciate the info.
Bill
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Post by Silar on Sept 24, 2015 4:43:47 GMT -5
I think what's throwing me off is that I'm using 8 gram sliders with a 1k contra spring and it's peaking at 10k rpm at takeoff, and around 35mph to 40mph, I'm already at around 8500 rpm. It takes off fine, but is a bit high RPM for the first few seconds until I get up to around 25mph or so. I thought contra spring because maybe there wasn't enough resistance in it almost like staying in first gear a bit longer before it shifts, but maybe my clutch shoes are slipping initially.
Hopefully I'll get some time this week or weekend to pull the clutch and check it out.
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Post by 90GTVert on Sept 24, 2015 7:59:08 GMT -5
That sounds like you could have a clutch issue. Springs too stiff or a lack of friction. The RPM at speed seems OK to me unless you have upgears.
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Post by Silar on Sept 24, 2015 17:10:08 GMT -5
That sounds like you could have a clutch issue. Springs too stiff or a lack of friction. The RPM at speed seems OK to me unless you have upgears. Thanks Brent. Gonna be pulling it this weekend to give it a once over! I'll probably be ordering a new one since I'm guessing the shoes are probably pretty worn.. |
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