YZ250 Problem

YZRider · #1 (**permalink**) 10-08-2005

First post here, Id just like to say this is a great forum lots of really good information.

I have a 2002 Yz250 and as soon as i get into 5th gear it starts jerking under acceleration and not under steady speed, any suggestions to what this could be?

Thanks

EDIT: I forgot to mention that my fmf pipe doesnt seem to be seating very well and some smoke will come out of the gap during start up could this be the issue?

steveblaze4 · #2 (**permalink**) 04-06-2006

Also my first post. Also wanna say great site!

I actually signed up just for the same problem that you are having.

I have an '03 YZ250 and as soon as I get into 5th gear is starts jerking. It's gotta be a motor problem, not tranny. Everyone I have talked to so far says it's either electrical or intake. If anyone knows, please reply.

Thanks for any help fellow 2-strokers!

zillaguy89 · #3 (**permalink**) 04-06-2006

the pipe thing isn't an issue, thats really more of an annoyance. it sounds like a fuel issue to me. does it do it all the time in 5th or just when your hard on the throttle?

YZRider · #4 (**permalink**) 04-07-2006

Haha this post is so old but i fixed the problem it ended up that my 3rd/5th which share the same gear where messed right up its prolly the same problem you have it looked like it was made of a weaker alloy then 1st,2nd,4th in total it costed me like 200 in parts.

steveblaze4 · #5 (**permalink**) 04-09-2006

so you had to split the cases which is where cost could be an issue? where did you get the gears with the stronger alloy? thanks for replying.

YZRider · #6 (**permalink**) 04-10-2006

Yeah parts wise it wasnt so bad i just went to my local dealer and got an aftermarket 3rd/5th i'm not home right now so i cant give you the exact part # etc. But to do it myself i was looking around 250ish (New Seals,Gasket,Fluids,Gear)CDN dollars so hope that helps.