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Post by peascreek on May 20, 2018 15:48:29 GMT -5
I seem to be having a random, yet recurring problem with my scooter not wanting to drop to a lower ratio, happens randomly at various speeds, sometimes it just bogs then boom, drops. As far as I can tell, the engines is not the issue, something in the CVT is.
I'm going to to be doing a vale adjustment on it shortly and add a tachomter finally, but is there anything common in the way of issues I should look for so I can pull the belt cover as well and see what's up?
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Post by kagetenshi on May 20, 2018 16:17:38 GMT -5
That sounds like it could be worn weights in the variator?
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Post by peascreek on May 20, 2018 16:40:54 GMT -5
Replaced the rollers with Dr. Pulley sliders and a new belt less than 1000 miles ago, did no service to the clutch at that time.
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Post by kagetenshi on May 20, 2018 16:47:38 GMT -5
In that case, I would suspect either sticking clutch pads or a groove in one of the pulleys.
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Post by humanshield on May 20, 2018 18:24:10 GMT -5
Check clutch shoes for cracks. I get that all the time Also check springs and the roller bearing in the clutch while in there. I've also seen the little pins in the clutch wear out so that it wount move properly. If in doubt, just slap a whole new clutch and variator on it. That "should" cure it.
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Post by peascreek on May 20, 2018 23:36:43 GMT -5
As hard as I've been riding it, wouldn't surprise me if did something stupid, we'll get it pulled apart in a couople days, got a privacy fence going in Tuesday
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Post by snaker on May 21, 2018 10:58:33 GMT -5
Your describing a classic symptom of a driven pulley not downshifting properly. If your not doing any maintenance to the pulley its probably binding due to old/no grease and probably shot. If you don't/won't maintain the pulley then plan on replacing it once a year or so.
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Post by peascreek on May 21, 2018 19:42:48 GMT -5
OK, got to it, I lost an older video for comparison, but it seems to me the clutch pulleys are opening to soon and taking to long to close. Once removed, I can open it by hand, it takes effort but it doesn;t bind, appears to move smoothly. The variiator faces have a few shallow grooves, you can feel them, but with a straight edge not much light comes through at all, they're very shallow. Don't have the tools to disassemble the clutch, byt the time I either bought them, rented them or took it to a shop, I'd already have a good chunk spent towards a new clutch assembly which is under $160 for everything.
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Post by peascreek on May 21, 2018 22:29:10 GMT -5
Thanks to my dad's old "workmate" and one his industrial crescent wrenches, I was actually able to get the clutch apart. The bearings are good, everything is smooth and free with no binding on the pulley, plenty of grease and the seals are good. Contra spring has light surface rust doesn't look deformed, it slides smoothly in the cup, the clutch pads look OK to me, not sure what OK is supposed to look like. The pulley faces are perfectly smooth with no discernible grooves.
The variator on the other does appear to have some binding issues at least when I slide it in and out, the busging is marred, slight slop in the fit, no grease on it either, was told not to by someone somewhere so I didn't, the sliders look fine.
Is there supposed to be grease anywhere on the variator assembly. Short of just replacing everything, not sure what's hang up.
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Post by pinkscoot on May 22, 2018 9:20:49 GMT -5
There should be no grease in the variator, though I have had a few that did grease it up where the rollers are but they have o-rings and a cover to control it. The only perpuse I can find for the grease is to keep the rollers quieter.
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Post by peascreek on May 22, 2018 10:19:42 GMT -5
does the CVT look like it's working correctly in the video? I can;t see where it binds at all, but it's not under any real load either.
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Post by GrumpyUnk on May 22, 2018 11:25:36 GMT -5
The contra spring is what makes the variator give up when the rpms drop. The spring will push the sides of the pulley together, against the variator trying to expand its pulley. If the contra is weak, it will not be able to push and make the diameter of the 'clutch' larger(lower gear ratio), and you'll stay in higher gear until it does. It is totally spring pressure against the centrifugal pressure developed by the weights in the variator. The variator always wants to squeeze the front pulley together and increase effective diameter(high gear) whenever the engine is running. The contra spring opposes this force, and tries to keep ITS pulley walls closer together, and thus a 'lower' effective gear. One or the other wins the tug o' war, and the CVT upshifts or downshifts. I'd seriously think about installing a new spring. Someone who knows better may disagree.
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Post by peascreek on May 22, 2018 11:57:00 GMT -5
Oddly I was just going to ask about the spring, I reassembled the clutch, I was able to compress the spring by hand and hold it in place with one hand while I clamped it in the work table to tighten the nut, that doesn't seem right.
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Post by peascreek on May 22, 2018 14:14:38 GMT -5
noticed I posted this in 49cc, should be 100cc plus section, sorry about that.
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Post by scooterted on May 22, 2018 14:20:47 GMT -5
I would expect a 100cc+ engine to have a pretty stiff contra spring...
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