XS250 won’t rev cleanly

[Boycer67]

Hi, I have an xs 250 with aftermarket filters & 2into1 exhaust, which runs ok when being revved, but when it is warm it won’t rev cleanly from tickover & often stalls if I blip the throttle. Can be really difficult to pull away with out really revving.

I’ve cleaned the carbs with ultrasonic, so they are re clean & checked the timing is ok. Presume it is something to do with the jetting, but don’t know much about jetting & where to get jets if that is the case.

Any help would be appreciated…

cheers

[drewpy]

CV carbs need a liner airflow to work properly.

I used the pipes to the original filters and popped some filter over them.

 

to do a proper job, you'll need to get o a dyno to dial in the fuelling