fastducs Posted March 31, 2009 Report Share Posted March 31, 2009 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? Quote Link to comment Share on other sites More sharing options...
ahamayfrank Posted April 1, 2009 Report Share Posted April 1, 2009 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 Quote Link to comment Share on other sites More sharing options...
fastducs Posted April 1, 2009 Author Report Share Posted April 1, 2009 (edited) 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, 2009 by fastducs Quote Link to comment Share on other sites More sharing options...
hop blip and a jump Posted April 2, 2009 Report Share Posted April 2, 2009 (edited) 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, 2009 by hop blip and a jump Quote Link to comment Share on other sites More sharing options...
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