Yamaha 9.9 HT help

[Thunder21]

Hey I’m looking for a hand with getting my 9.9ht running correctly.

Its been sitting for a couple years so I cleaned the carb, serviced it and gave it a once over but I’m still having an issue . When firing it up it’ll idle great but as soon as I give it a small amount of fuel it’ll want to die. If I go from idle to heavy throttle it’ll rev up and run fine. It seems like maybe an accelerator pump problem because the issue seems to happen as soon as the pump moves. I’ve pulled it apart and I don’t see any tears in the rubber but it’s almost like it’s getting air from somewhere when that accelerator pump starts to move. When at idle if I push down on the pump with my finger it’ll bog down. I’m curious if anyone has encountered this or has any ideas.

Thanks

 

[seachicken]

I'd say the main jet in the carb is partially blocked but not knowing exactly the configuration of the carb I can't say for sure. Small carbs that I've worked on typically don't have accelerator pumps. If you're pushing on the accelerator pumps to add fuel without opening the butterfly then your making the mixture rich and it should bog down

 

[Thunder21]

I'd say the main jet in the carb is partially blocked but not knowing exactly the configuration of the carb I can't say for sure. Small carbs that I've worked on typically don't have accelerator pumps. If you're pushing on the accelerator pumps to add fuel without opening the butterfly then your making the mixture rich and it should bog down

I’m pretty confident the jets are clean

 

[ab1752]

Sure sound like a fuel pump, mine went out last season at the beginning. It's easy to replace and I was in a hurry so I just snagged one off amazon. Just be careful to swap the O ring too...don't ask haha