Hello group. I hope you don't mind a visit from a Montesa owner :-) Can anyone enlighten me about the clutch pack composition of a SY250F? I am working on improving clutch action in my enduro bike (Yamaha wr250F) which is based on the same engine as the SY250F. Comparing the parts diagrams I see the clutch boss, clutch basket, and pressure plate are identical. The difference is actuator arm, and clutch plates. Actuator arm is longer, I presume? I would appreciate an actual measurement.

But the real mystery to me is the clutch pack. The parts diagram shows 5 friction plates, 5 steel plates, and 1 mystery plate. The mystery part is #13 on the diagram, it is part # S108-11000-00-00 listed as "Clutch Fix". Can anybody tell me what it is, and how thick it is?

Also, are there aftermarket clutch packs available for SY250F, e.g. Sureflex? How does it compare to stock?

fastducs,

I have owned a couple YZ250Fs, 1 WR250F, and 1 SY250F and am a self-proclaimed expert on some of the above (just kidding). I have been in the clutch of these models and I also have opinions, so maybe I can help you finding the information you are looking for. I could type all I know and still not answer your question

Frank, thanks very much! I will take you up on your offer and give you a call today. When is the best time to call?

I am in Georgia so we should both speak English, or some version of it

LOL! I promise to suppress my Boston accent

Regards, Vitaly

Edited April 1, 200917 yr by fastducs

I think the part you asked about is an aluminium spacer it's about 1cm thick, and there is a mod where you re arrange the order of the plates, and use semi synt oil instead off fully synt makes hell of a difference.

Try sending a PM to arnoux he should know.

Edited April 2, 200917 yr by hop blip and a jump