Hi all, new to the forum, looking forward to getting some help/advice on maintaining an 18 yr old atv! So my King Quad 300, recently started running really rough (otherwise ok til this point) at anything more than idle. After started, choke on/off, doesn't seem to matter, it shutters (Not sure how else to explain it) really bad when given throttle. I can let the engine run for several minutes, but this never improves.
Fuel pump checks out ok, and I don't see any gas in the fuel pump vacuum line. I am a novice on a carburetor, but I need to see what's going on, so after taking it apart, I have a question about this plastic part with an o-ring that is above the jet needle. Appears as if someone rebuilt this carb, because it is extremely clean...so I am wondering if this plastic part looks to be typical for this carb...or not. Thanks in advance for the help!