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Re: 2007 Yamaha 9.9 High Thrust have to run on choke
Thanks for the replies, folks.
I did tear apart the fuel pump, but other than being a bit grungy it seemed ok.
I opened up the carb again, and one of my jets had come loose. Guess I didn't put it back together properly.
She's running pretty smooth now. There's a slight hickup when I full throttle her, but nothing serious.
I spritzed quite a bit of carb cleaner into the air-intake as well.
I filed down the needle a bit as it felt like it might be sticking.
Also, when I put the carb back in I didn't screw it back in tight enough I think. It was leaking a bit.
Lessons learned: rebuild carbs very carefully, putting everything back in the same situation it was as you were tearing it down. Use clean fuel, clean everything, especially the jets. Make sure the needle isn't sticking. Make sure you prime the engine with fuel (duh). Cleaning the fuel pump might have helped, hard to say. Tighten all screws appropriately.
I don't know exactly what fixed it, but there you go. I did go from barely running to running 95%, so I'm pretty happy.