Jump to content
Sign in to follow this  

YZ 250 F 08 problems

Recommended Posts

First of all let me give the data of my YZ 250 F 08 model:

Model (YZ or WR 250F):YZ250F 08

Timing (WR-YZ):YZ

Main jet:170

Pilot Jet: 48

Fuel screw (turns out): 2

Needle model/Clip position: GYTR/4th

Airbox lid (on or off):It´s an Yz

Pipe: Complete Leovince X3 Ti

Altitude where you ride:Sea level to 2, 3 km´s above see level of a bit more somethimes.

Temperature where you ride:0 in the winter to 35celsius in the summer

Have my bike for a year now and never had a single problem except when it camed but i put a smaller MJ and it was perfect since now.

The problem started when i cleaned the carburator.

After cleaning it i drove all day and all was ok but at the end of the day it was booging in low rpm´s so i check all the pieces in the carburator and jets and put a new GYTR needle.

Everything is perfect with the bike, valves, piston, cylinder, all checked and some parts exchanged during the time i have it.

So i put a GYTR needle with a Main jet of 176.

At this moment i put a 170 Main Jet and it seems to be better.

Yesterday i rode all day in a motocross track and the bike is fine but after riding for some time i went to some hills and i noticed that with inclination is when the bike fails.

With no inclination all ok, with inclination not ok, when i have the thotlle in 1/4 or a bit more it chockes and real power only in high revs.

Today i missed a XC event after doing pratices because it had too much hills and the bike was not ok...i am pissed as you guys can understand.

Tomorow i will try a 168 MJ with the 2nd clip position but i am starting to think that i have a problem in the carburator but i don´t know how to say it in english "the ball"????

Tomorow i will meet my mechanic and make some tests on a nice hillclimb i kepp you posted.

Opinions are obviasly welcome.

Share this post

Link to post
Share on other sites


That was the name is was looking for.

Will check it

Share this post

Link to post
Share on other sites

Float heigth at normal measure.

I made a mistake in the first post, the clip was at the 5th position, now it´s on the 3th and i decreased the MJ for a 168.

I could not drive it much time today but it seems that it is ok.

This thursday i have a schedule train session and i will see if the problem is fixed now.

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this