MRWood
Well-Known Member
I do have the kit that has been sitting around for a few years. I've had the carb off and apart a number of times so I'm somewhat familiar with it, heavy emphasis on somewhat familiar lol.
Yamaha T9.9 carburetor needed
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kingblazer84
Crew Member
perfect, well they refer to them as Main Jets in that diagram but as long as you remove both and clean them up nicely should fire up and idle nicely.
MRWood
Well-Known Member
kingblazer84
Crew Member
MRWood
Well-Known Member
I didn't realize about the white plug one, I didn't get that. It's not quite back together yet, I’ll do that. Thanks for the heads up.
MRWood
Well-Known Member
A real life success story. I wasn’t holding out much hope but I got it going and tuned it up a bit with the airflow screw to dial it in and it works beautifully. Thanks for the help Mr Blazer, really appreciate it.
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kingblazer84
Crew Member
A real life success story. I wasn’t holding out much hope but I got it going and tuned it up a bit with the airflow screw to dial it in and it works beautifully. Thanks for the help Mr Blazer, really appreciate it.
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That’s awesome I’m glad it worked out! Purrs like a kitten I see
I have a 2007 Yamaha 8hp hi thrust, ran perfectly up until last year. Now it idles rough, if I shut it off I have to open throttle wide open to get it to start and it seems way harder on fuel. Any ideas?That’s awesome I’m glad it worked out! Purrs like a kitten I see
kingblazer84
Crew Member
same idea prob have those jets that are plugged up, youll have to pull the carb off and find the jets clean em out really well then reassemble and I bet it comes back to life.
MRWood
Well-Known Member
Like Kingblazer said, you need to clean the hell out of the carb. Mine looked spotless but the proof was how it ran before and after. I did have a carb kit for mine which I used most of the parts from including the float bowl and float needle valve and gaskets. I blew out the passages with carb cleaner and compressed air. There are also tiny passages that are smaller than a pin that need cleaning. I used a single strand of wire from some down rigger cable. The most important though is the main jets in the middle of the carb reservoir. You need to take those completely out and clean and blow the heck out of them. Be careful when the carb is apart as things can fall out and get lost. Best to work over a flat area with a white cloth or similar area. That way nothing disappears. Good luck.
Max123
Well-Known Member
Ha, just saw this thread - looks like we are all going through the same thing:
My carb is identical to yours. Just curious - when you did the rebuild kit, did you replace the float? On mine, the old float pivots about 3/4". When I installed the new float, it would not pivot at all until I noticed that it had tabs which bend when you move the float manually to set the amount of pivot. I set mine to roughly match what it was, but I'm not sure if that's correct - I don't trust whatever the previous owner did, and I don't have a shop manual.
As a side note - I don't know if yours spends much time in salt water (mine did), but I would recommend replacing the t-stat - takes about 30seconds to do it, and I was astonished at how much salt was baked in there.
My carb is identical to yours. Just curious - when you did the rebuild kit, did you replace the float? On mine, the old float pivots about 3/4". When I installed the new float, it would not pivot at all until I noticed that it had tabs which bend when you move the float manually to set the amount of pivot. I set mine to roughly match what it was, but I'm not sure if that's correct - I don't trust whatever the previous owner did, and I don't have a shop manual.
As a side note - I don't know if yours spends much time in salt water (mine did), but I would recommend replacing the t-stat - takes about 30seconds to do it, and I was astonished at how much salt was baked in there.
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