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Post by sailracer on Aug 17, 2013 7:36:14 GMT -5
Does anybody know the clutch spring RPM rating for stock qmb 139's ?And which aftermarket (1/1.5/or2K) work best with a BBK'and 16-50 gears?
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Post by ltdhpp on Aug 17, 2013 10:28:47 GMT -5
Stock clutch engagement is at about 2- 2.5k rpm - the tighter springs add their rating to this. Its just what you want, they don't care what jug or gears you have. One thing is for sure, tighter springs put more stress on the clutch - if you have a BBK I'd get a performance clutch and clutch bell. My stock scooter broke the stock clutch when I put tighter springs in it  |
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