250 GS stalls at 2500 RPM need help diagnosing

[ZS_RevHunter]

Our 250 GS stalls as soon as I open the throttle above 2500 RPM, but it runs smoothly below that point. It starts up without any issues. I have changed the spark plug, cleaned the carbs, and changed the fuel, but the problem still exists. Might there be a fuel flow or carb issue here? Since it's my daily ride, any guidance would be greatly valued

 

[Lady Liberty]

I'm not too sure, but it sounds like it could be a carb or fuel flow problem, maybe check the jets or fuel lines? it could also be a vacuum leak causing the stall

 

[knobbyroadrunner]

It's possible that the main jet is blocked or there's a restriction in the fuel flow when demand is high. You should check the fuel lines, adjust the float height, and ensure that the main jet is completely clear.

 

[iron|zongster]

Yep, seems like we're on the same page. Just a heads-up, a gunky air filter might cut down airflow when you rev it up.

 

[Alan]

Well from what I have read over here, it looks like the group is already suggesting you with the right stuff here @ZS_RevHunter. If this is still acting up, try double checking the petcock and tank vent since a clogged vent can act exactly like a fuel starvation issue once revs climb.