Primary ratio

[RJH]

I read in a magazine that the gear ratio reduction for the primary is changeable.

True or false

 

[Srxspec]

Not changeable to my knowledge and have not heard of it being changeable from anyone within Yamaha. I would have to believe the magazine is incorrect. It would be quite a job to change it.

 

[ptrudel]

i read that too and i couldn't really grasp what they meant...i never heard of this within yamaha either

 

[Bakemono]

I could see where you could maybe change out the gears and get more revs out of the engine without spinning the clutch as much, but why would you want to?
If you look at the dyno chart the power really starts to drop off after 11,500 rpm.

 

[Srxspec]

At peak HP (11,100 rpm) the primary clutch is only spinning 8100 rpm. Even at 12,200 engine rpm (rev limiter) the clutch would only spin 8900 rpm.