Just thought it would be a great idea to keep all clutching improvements and testing under one roof so we can easily track the improvements.
FYI I have been seeing more and more Winder's with the secondary bushings completely chewed up in helix and sheave.
We have a few excellent Yamaha clutch experts around here saying that the bushing material is the same one as let's say a 1997 srx and it cannot handle the load period. We are currently awaiting a set of bushings x2 from a guy off this site(will not mention who just yet) that had them made and we will be testing his findings. He has also chewed up bushings in helix and sheave at 550km on his winder and was snapping belts at will. He said zero issues now on stage 4 maptuner x some 600 km later and has also been running this set up on his 300HP viper with 10,000km with zero belts and no bushing slop.
The new bushings are brass and are a way tighter fit then the stock and also slightly longer to give more leverage. The stock have too much play from new and the hp just compounds this issue fater and all his rollers now touch which makes sense now that the shaft to sheave/helix is dead straight
This is just a trial at this point but after seeing three bushing now fail it's hard to think that this will not happen to all it's just a matter of time. I will post results in a week or so.
FYI I have been seeing more and more Winder's with the secondary bushings completely chewed up in helix and sheave.
We have a few excellent Yamaha clutch experts around here saying that the bushing material is the same one as let's say a 1997 srx and it cannot handle the load period. We are currently awaiting a set of bushings x2 from a guy off this site(will not mention who just yet) that had them made and we will be testing his findings. He has also chewed up bushings in helix and sheave at 550km on his winder and was snapping belts at will. He said zero issues now on stage 4 maptuner x some 600 km later and has also been running this set up on his 300HP viper with 10,000km with zero belts and no bushing slop.
The new bushings are brass and are a way tighter fit then the stock and also slightly longer to give more leverage. The stock have too much play from new and the hp just compounds this issue fater and all his rollers now touch which makes sense now that the shaft to sheave/helix is dead straight
This is just a trial at this point but after seeing three bushing now fail it's hard to think that this will not happen to all it's just a matter of time. I will post results in a week or so.
jonlafon1
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The bushing thing does not surprise me much.. SJ on here was all over those bushings, he thought the same > to much slop.. Thanks for post SEVS 11
1100saber
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Good idea to put this all in one thread. I'm done with the stock secondary. This will be the last weekend I ride with it. Bit the bullet today. Should arrive next week. I'll need to do some helix/spring testing but I will post results here.
stevewithOCD
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That is PRETTY! What is that & how much? I would take that off & sleep with it every night...
Shagnos
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$700 is a big pill to swallow for something that should work from the factory.
Shagnos
TY 4 Stroke Junkie
Have seen this and $350 for a bushing and 3 rollers is crazy!!
1100saber
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You're certainly right. But the season too short for me to keep messing with stock secondary. I've used stm clutches on my past turbo sleds and the perform fantastic. The stock secondary is quickly showing it's weakness in within low miles and stock boost. I'll be running my sled boosted and would likely make all the known problems show up that much faster.
What model # is that?
1100saber
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Jafo1970
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Installed my 38 helix from STM and am pleased with the performance over the stock helix. The only thing I don't like is I only have one roller touching now on the STM helix. The stock one I had 2 with the 3rd dragging so not totally free spinning. I also had to grind a little out of the back side of the hole in the STM helix to allow the spring tang to fit all the way in like the stock helix hole. When I first installed it without grinding it pushed up and almost was touching the next coil in that spot. I had to remove about 2.5 grams out of the middle of heavy hitters to get it back to 8900/9000rpms with the 38 helix which I figured. The increase in topend performance was the biggest improvement. I was able to rattle off 122gps on my 1000' stretch of ice with 1" of light snow. 2mph faster than my 16 turbo cat ever did at 21psi. Speedo was 126. I have no doubts I could squeeze upper 120's gps on longer pulls even with this 1 1/4" ripper 2. I'm studded 180 1.575 megabites. evo stage 3, td quiet can, 22-41 gearing, 4 wheel kit and 2 extra wheels added towards back, 8jp belt. Clutches were just warm on back to back runs.
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