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Post by keltex78 on Feb 1, 2014 13:37:27 GMT -5
Jonway YY250T, 244CC:
This week, my scooter began making a loud clattering noise while at idle the noise seemed to die out over ~30mph. This afternoon, I removed the CVT cover to determine if the sound was from belt flop or something else. Without the cover, I noted the same sound coming from the actual CVT pully, so I removed that from the bike. With the pully assembly removed, I recranked the bike and noted that the rattling had been eliminated.
I then placed the CVT pully face down, and removed the three screw holding the roller assembly cover plate in place, breaking one of the screws in the process. On removing inner roller retaining plate (?) I noted that three of the rollers were not correctly seated in their channels. I do not see any damage to the rollers or CVT but the condition I found it in seemed unusual to me, along with the sudden onset of the noise. I have a picture of the assembly as I found it when opened but it will be Monday before I can post that.
So, is this cause for alarm?
Should I clean and reassemble the CVT I have?
Should I replace this unit with a new one?
Or should I use this as an opportunity to upgrade from rollers to sliders? :-)
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Post by ramblinman on Feb 1, 2014 13:51:31 GMT -5
apparently not all rollers are alike and it is possible to have rollers 1mm (give or take) too small. seems like it is a common problem from what i have read. i'd buy new rollers or sliders... go with a reputable brand and you shouldn't have future problems.
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Post by keltex78 on Feb 1, 2014 14:05:08 GMT -5
So, @ 4300 miles, rollers that are already border-line too small begin to wear which pushes then below the limit resulting their jumping out of track?
The rollers do show wear so in any case, I plan to replace them, most likely with sliders...
Edit...
Just weighed my rollers, 26g, verified by individual weights and then all together divided by six. So would I match weights to go to sliders or should they be changed?
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Post by keltex78 on Feb 1, 2014 15:17:07 GMT -5
Okay, I've cleaned the factory rollers to examine them more closely and they appear to be in pretty bad shape. Several flats on all them, and one in particular that is worn more on one end than the other... Time to order...
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Post by flyangler on Feb 1, 2014 15:19:49 GMT -5
I'm trying to remember what I did on my 244, I think I went one size up on the sliders.
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Post by keltex78 on Feb 1, 2014 22:29:47 GMT -5
Okay, measuring my rollers;
18mm x 23mm x 26g.
Bike is a highway commuter; I weigh about 180lbs. Typically run @~60-65 mph, just shy of WOT. Slider or roller, should I bump up the weight to get me a bit easier top end?
Going to go ahead and get a replacement belt while it's torn down; factory belt is a Gates Powerlink and still has a lot of life left, so I'll keep that as a spare.
Edit:
All of my factory rollers have a heavy dark glazing over the white material; is that normal?
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Post by keltex78 on Feb 3, 2014 11:33:15 GMT -5
Here are the pictures of the variator: First, This is what I found on removing the cover:  As I mentioned, one of the screws holding the variator cover broke off on removal. After cleaning, I saw what appears to be adhesive around the broken screw. I'm assuming that the factory worker assembling this unit stripped the threads so he just glued the screw in place. Now I'm going to have to drill it out and re-tap the hole. It's not grease; it's definitely a hardened substance:  These are the rollers after cleaning:  Just one more question: With the variator completely assembled with the rollers in place, if it is shaken or turned over, the rollers fall out of their tracks. This doesn't seem right to me. Does the variator rely on the belt to hold pressure against the rollers or is this a more severe issue? |
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Post by keltex78 on Feb 3, 2014 14:49:08 GMT -5
I just ordered a set of replacement Dr. Pulley rollers (not sliders, just being moderately cheap here) along with a replacement drive belt from partsforscooters.com. (Edit: Wow! Just over an hour from time I ordered and already shipped with a tracking number!) I went with 26g weights, same as the factory since I was happy with performance already. I'll be putting it all back together once I get the parts...
The variator had a lot of a VERY thick/sticky/nasty grease all around the outside rim; the grease was caked on and very difficult to clean off. With the new Dr Pulley rollers, should I use a dry lube (graphite or other) or would a more conventional grease be better. I have both graphite powder and white lithium grease available already...
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Post by fugaziiv on Feb 4, 2014 16:23:16 GMT -5
I just ordered a set of replacement Dr. Pulley rollers (not sliders, just being moderately cheap here) along with a replacement drive belt from partsforscooters.com. (Edit: Wow! Just over an hour from time I ordered and already shipped with a tracking number!) I went with 26g weights, same as the factory since I was happy with performance already. I'll be putting it all back together once I get the parts... The variator had a lot of a VERY thick/sticky/nasty grease all around the outside rim; the grease was caked on and very difficult to clean off. With the new Dr Pulley rollers, should I use a dry lube (graphite or other) or would a more conventional grease be better. I have both graphite powder and white lithium grease available already... Dr. Pulley rollers and sliders are self lubricating. You install them dry for best performance. Have fun! Matt |
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Post by spandi on Feb 4, 2014 17:32:42 GMT -5
Yep. I was about to say no need for that gloppy goop in your variator.  |
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