Jump to content
Sign in to follow this  

Yz125 bog

Recommended Posts

Hey guys as some of you may know I jut rebuilt the top end on a bike I bought. It has a fatty fmf exhaust. I have no idea jetting or anything. When I get on the throttle it won't get into the power band unless I ride around like that for a little while then it clears out. Spark plug was black after about 15 minutes of riding. The mixture is probably about 28:1. What I used for breaking it in. Any suggestions?

Share this post


Link to post
Share on other sites

What year bike do you have?

Sounds like the fuel/air mixture is rich (too much fuel and not enough air)

I mix my fuel and oil at 32:1

Do you know how to change out the jets in the carb?

Share this post


Link to post
Share on other sites

It's a 2001 yz125. Could you possibly explain how to adjust air to fuel ratios?

Unfortunately I don't know how to change jets.

Share this post


Link to post
Share on other sites

Maybe clean the powervalve? Look on ebay for a manual. I just got one for my yz for $7 and a few greasy fingerprints. Itll be well worth it.

Share this post


Link to post
Share on other sites

Hmm interesting stuff here guys, thanks.

I'll take a look at everything and see what I can come up with.

As far as what mixture I ran before, or jetting.. I have no clue, I bought the bike needing a rebuild, so I don't know how it was run before hand.

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

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×