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- 2014 Yamaha SR Viper LTX, 2014 Yamaha SR Viper RTX SE, 2015 Yamaha SR Viper MTX SE 162 (turbo), 2015 Yamaha SR Viper MTX SE 153
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SR Viper clutch kits, call to orders your today! 605-387-2833
Gain 3-4 sled lengths acceleration and top end speed (your stock gearing will allow 103-105 mph) with the clutch kit. The clutch kit is the only complete kit on the market that includes primary spring, weights, secondary spring, and helix. Pricing from now until December 1st $450 with a new 8DN belt included in the package!
Turbo SR Vipers, whether you're a 129" model or a 162" model running at sea level to 10,000+ foot elevation, we can cover your needs as well.
Gain 3-4 sled lengths acceleration and top end speed (your stock gearing will allow 103-105 mph) with the clutch kit. The clutch kit is the only complete kit on the market that includes primary spring, weights, secondary spring, and helix. Pricing from now until December 1st $450 with a new 8DN belt included in the package!
Turbo SR Vipers, whether you're a 129" model or a 162" model running at sea level to 10,000+ foot elevation, we can cover your needs as well.

trevorl1
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- 2014 sr viper xtx-se
What are the advantages to a new helix over the factory one?
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Quicker upshift (acceleration) & better backshift (on/off throttle response).

putz21
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- '25 Sidewinder XTX LE w/EPS
'23 Sidewinder LTX LE w/EPS
I bought your clutch kit last year and love it. Any differences between last year's and this year's?
I believe last years kit came with a H helix. The new kit comes with a K helix.
yzf1999
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Won't the secondary bind using the 8dn belt without machining??

putz21
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- '25 Sidewinder XTX LE w/EPS
'23 Sidewinder LTX LE w/EPS
I believe last years kit came with a H helix. The new kit comes with a K helix.
I just checked my spec sheet from Ulmer. It says the Helix is a K from my kit last year.
- Joined
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- 2014 Yamaha SR Viper LTX, 2014 Yamaha SR Viper RTX SE, 2015 Yamaha SR Viper MTX SE 162 (turbo), 2015 Yamaha SR Viper MTX SE 153
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I bought your clutch kit last year and love it. Any differences between last year's and this year's?
I tweaked the weights slightly, if you're happy with your kit, you may have updated settings already as started doing the changes in season last year.
I have two choices in helix when setting up your clutch kit. You will either receive a K helix or H helix, depending on your rider weight and track lug height.I believe last years kit came with a H helix. The new kit comes with a K helix.
It won't bind without machining, but you can run out of adjustment. I have either the OSP belt adjuster we can sell as well or you can send your secondary in for machining.Won't the secondary bind using the 8dn belt without machining??
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