03 Yama 4S 25HP

[skipper123]

I have been working on the motor replacing all the fuel lines gas tank primer bulb and removed the carb and cleaned with carb cleaner and compressed air five times to get it to run WOT. It will now start and idle great but when the throttle is applied it has a bad stumble before winding up to WOT. I have to rock the throttle a few times. Do any of you guys know what part of the carb to look at for this problem. My prime start is broke but it starts and idles fine now that the weather is warm. Once it hits WOT it will run all day. It will also idle all day.

 

[crazymanme2]

Maybe they have some sort of accelerator pump on them that the holes are clogged?

 

[skipper123]

After removing and cleaning five times found a small grain of trash in one port with a magnifying glass. Fixed and running great.