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Yamaha - New slipping problem? Tranny or clutch?

Yamaha YFM660R Raptor (2001-2005) - Yamaha ATV Forum - www.bluetraxx.com
Got my 03 660 running again, upped the jets to 150/155 and 27 pilot, moved needles to 3rd clip and had way better torque and power and cut way down on the backfiring.. also there is no parking brake, and rev switch is grounded. It still slightly bogged out in 1st at 3/4 - full throttle.. might have to play with the mixing screws now.. anyways. Went out to the woods with my bf Easter morning to test it out on the straight aways.. he has a raptor 350. I was riding my 660 fine the whole time besides the slight bogging at 3/4 throttle on the straight aways.. but no stalling out. he had just put a new chain on his and it snapped off while doing a burn out...the link popped off. soo he took my quad back to his house to get a tow strap (I dont know my way back thro the woods) he kinda revs the hell out of it and every time he rides it he stalls it out a lot. Hes ridden sport bikes and stunted them most of his life and has his 350 now... i dont have a problem with it stalling.. not really sure what he is doing.. its def a different clutch feel than his 350 because I have ridden his a few times.. Im just use to the 660 clutch I guess.. you almost have to ride the clutch a bit so it doesnt stall in 1st.. its a bit touchy.. and its kinda of hard to shift up into second.. if I lightly shift I sometimes put it in neutral.. (I use to have a yamaha YZF600r street bike and it was the same exact way with having to hard shift up into second.. and its kinda difficult to put into neutral,, gotta play w it a few times.. same with the raptor 660)

Ok sooo I thought the raptor 660 was running way better than before.. after jetting and was super happy.. so we had to tow his bike home through the woods.. he drove my 660 and i sat on his 350 so less weight.. he kept stalling my 660 out, going thro mud, trying to go over logs, in turns ect.. We got finally back to his yard and he was like its not really moving... we untied his bike and he was giving my 660 gas and releasing the clutch and it would rev up like it was going but the wheels barely moved..it would be in gear.. the engine rev did not match the wheel speed at all, would go at a slow speed like it was slipping or barely catching to spin the wheels.. he drove it around the house and it slowly picked up speed.. then drove it into the garage.. he said I think your tranny is shot.. im like oh wtfff :( (We then had to leave to Easter lunch.. so i didnt test it after that..) I just got it running again, this suckssss.. to me it sounds like the clutch is sliping... the guy i bought it from messed around in the shifter side of the case (replaced the case cover without a gasket and it was leaking oil like crazy... I think he said he replaced the clutch cable.. maybe he said the clutch too i forgot.. deff the cable because it looks new.. I need to lube the cable also because it its not smooth, kinda sticks...sometimes like clicks hard at the lever.

When i put the gasket on the case I obviously did a full oil change w k&n filter.. filled with Yamalube All Purpose 4 Four Stroke Oil 10w-40.. case still leaked sooo drained it again and had to use permatex aviation form-a-gasket on the gasket and that finally sealed it.. so it got a 2x oil flush (flushed the upper reservoir as well the first time.. ran it and added more accordingly. bla bla..

Sooo my question is.. before I buy a transmission gear kit.. (I obviously dont want to split the case and deal with that crap..) does this even sound like a transmission problem?? or a clutch plate slip problem or clutch cable adjustment problem?

If the transmission is slipping I feel it would be making a grinding noise or not even makes the wheels spin at all if the fork snapped.. (i had a 650 streetfighter w 2nd gear forks snapped and it acted like neutral in 2nd...) and it doesn't make any bad noises.. just revs and slowly spins the wheels.. almost like a belt is just slipping and spinning but not fully grabbing to spin the axle... Not sure if he burned something out by towing his quad.. or messed something up by stalling out so much.. any input would be great, thanks!
Date: Apr 17, 2017    Labels: Yamaha


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