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Post by jakobythegreat on Apr 25, 2018 16:31:57 GMT -5
I have a heavly modified scooter. It has a 52mm big bore with A9cam performance variator with 8g sliders and 2rpm contra and clutch springs. I'm actually have a really bad oscillation type vibrating feeling after I get past 30mph and it stays that way until about 50mph but when I start going about 5-10mph over 50 it'll start rubbing the starter gear. It's leaving a big gash on the Kevlar belt and I can see where it's hitting it on the starter gear. If anyone's ever saw a 139qmb CVT you'll Know the starter gear is above the variator face plate and the gear protrudes a bit at the edge. I've grinded that down so much once the weights in the starter gear blew through the metal cuz I made it so thin well I got another one and didn't make it so thin but the belts still hitting at high speeds, I can kinda hear it. I was just wondering if anyone had any thoughts on the oscillation type vibrations in the CVT and what I could do to stop the belt hitting the starter gear?? Maybe a small spacer? I'm not sure but I've put new tires and and actually everythings new in the CVT.
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Post by KSR Moto on Apr 25, 2018 16:52:27 GMT -5
I have a heavly modified scooter. It has a 52mm big bore with A9cam performance variator with 8g sliders and 2rpm contra and clutch springs. I'm actually have a really bad oscillation type vibrating feeling after I get past 30mph and it stays that way until about 50mph but when I start going about 5-10mph over 50 it'll start rubbing the starter gear. It's leaving a big gash on the Kevlar belt and I can see where it's hitting it on the starter gear. If anyone's ever saw a 139qmb CVT you'll Know the starter gear is above the variator face plate and the gear protrudes a bit at the edge. I've grinded that down so much once the weights in the starter gear blew through the metal cuz I made it so thin well I got another one and didn't make it so thin but the belts still hitting at high speeds, I can kinda hear it. I was just wondering if anyone had any thoughts on the oscillation type vibrations in the CVT and what I could do to stop the belt hitting the starter gear?? Maybe a small spacer? I'm not sure but I've put new tires and and actually everythings new in the CVT. Can you even start the 52mm with the electric starter?, i had troubles with 47mm bore and stock electric starter If not then I would take out the bendix, el starter.. etc Try running it without starter bendix first and see what happens it is possible that some performance variator has much more belt travel and the belt comes too close to bendix Also check your variator and cvt components because there should not be too much vibration I had vibration problems recently coming from the cvt and it was a bad variator Also check that everything is aligned properly |
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Post by GrumpyUnk on Apr 27, 2018 12:43:30 GMT -5
How about a smaller belt? I don't think the belt should be traveling that far above the sides of the variator. Could be wrong. The faster you travel, the more the belt is forced towards the edge of the variator. Bipping down the road at 50 would be extreme... Smaller belt won't allow such travel, though you may lose a bit of top end.
tom
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Post by cagiva4ever on Apr 27, 2018 16:53:49 GMT -5
Do some tests with a STD diam from Variator. if you have "high speed" front variator in diam summink iirc 89mm , its no wonder belt hits starter Bendix. in top of that, any extra on Belt lenght will make things worse...
at same test you see if Oscillation vibration still exists...
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