Yamaha G9

asmith83

I have a 90 Yamaha G9 with a freshly rebuilt motor motor runs fine if I rev engine by hand on the carb however if I hook the throttle up sometimes it runs fine other times it will stutter and make a popping noise when trying to accelerate from a dead stop. I adjusted the valves .004 sprayed carb cleaner around the carb and got no response and bungee cord of the air box shut. Don't know what else it could be.

BGW

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Spicyunicorn

Try taping around the lid off the air box iv had to do that on warped ones to get them to completely seal

spriddle

Take the small governor cable off and throw it as far as you can!!!! Now, take the cable coming from the gas pedal and hook it directly to the carb. Adjust it so the throttle completely opens when you press the gas all the way and completely closes when you let off the gas pedal.

sho305

Check airbox again, check for crack/leak at carb spacer they get old and brittle. All fails you can hog out the main jet a little that should do it.

asmith83

Okay so apparently the gasket between the carb in the plastic carb spacer was not Sealing took it off use some gasket sealant around both sides put the carb back on it seems to be running okay so far thanks for all the help.

asmith83

Ok well it ran fine for a bit and now doing it again back fires threw carb when accelerating once it takes off runs good let off gas and accelerat again back fires few time then takes off could the igniter be bad? It has spark

Skoal82

Is the plastic isolator between the carb and engine cracked? It's really hard to tell without taking it off.

asmith83

I replace last year as I had similar problem took off and inspected again doesn't appear to be cracked

Skoal82

If you think it is your igniter.
I have a g9 igniter I just posted for sale in the classifieds.
I would ship it to you and if it fixes you problem I'd like 65 plus shipping.
If not just ship it back to me.

asmith83

I'm running out of options as to what the problems could be so I would be willing to give it a shot whereabouts are you located I could provide you with an email address