Jump to content
Sign in to follow this  

trx250x jetting issue

Recommended Posts

I have a trx250x that I have a 12:1 piston and a web cam with .335 lift and 280 degree duration, a cobra exhaust and foam air filter. I am trying to use the stock carb and can not get the thing jetted right. from off idle to 1/4 throttle I have a bog. If I dont let off it will die. If I work it right I can get the rpms up and then It will run out great. I went up with the pilot and ended up going back to stock. I have a very large main in it and feel that the main may be overriding the pilot down low. I am thinking of dropping the pilot from stock 38 to 35 to see if I can lean the low end out and allow the main to flow off idle. Someone tell me if I am making a mistake or tell me what I need to do. Right now I have a 160 main and it runs out ok on top but feels like anything smaller will start getting lean and I definitely cant have that.

Share this post


Link to post
Share on other sites

I would also like to know if I was to replace stock carb what should I look at getting. I have been told by some that I need an Fcr. What size, etc.?

Share this post


Link to post
Share on other sites

I have read some of the post on this site that pertain to the same problem but I dont have the same type carb and was wondering if someone had some advice for my situation for this carb. Thanks

Share this post


Link to post
Share on other sites

have you adjusted your idle mixture screw? i had a similar problem on my bike and thats all i needed to adjust. someone correct me if im wrong, but the idle mix is from idle to 1/8-1/4, then pilot it from there to almost half, then the needle takes over.

Share this post


Link to post
Share on other sites

Yes I have adjusted the mixture but still have this issue. The adjustments change the bog slightly but still have the bog. It still floods from off idle to 1/4. Can I remedy this with a smaller slow jet or pilot jet?

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  

×