I have a trail boss 250 that bogs down when ever I raise the rpms. It sounds like a fuel problem, but it's getting enough and I've cleaned the carb 5 times, tried different float adjustments, needle adjustments, and everything else that I could think of.
Any suggestions?? 110psi compression..

 

Sounds like it's sucking air throught the crank seals. Remove the clutch cover, and while the machine is idling spray carb cleaner behind the primary clutch. See what happenss, if the rpms change there you go.

 

check the plug to see if its running lean as well. good sign that there might be an air leak.

 

I have the same machine and I had the same problem, even down to cleaning the carb multiple times. I found that my reverse speed limiter was limiting the rpms even in low or hi. this speed limiter is below the gas tank on the backbone of the frame near the steering head and can be temporarily bypassed by disconnecting the black wire. If your'e problem goes away, you can run it that way or buy a new limiter.

 

Has it just started doing it? Any mods done to it? Do you know the main jet size it's using?

 

I bought it last fall, Not running. Now it runs good , Idle's great. If I go slow and not wide open on the throttle, It increases ok, but if I go wide open, even in neutral, it bogs. Not sure of the jet size.

 

Sounds like the main jetting is off to me.

And welcome to the forums.

 

mine does the same thing. mine sounds like the reverse limiter is limiting in foreward gear

 

sorry to bring up such an old post but did you ever get it fixed? mine was the reverse limiter limiting foreward drive. i just eleminated it all together and it works fine now