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Year

Yamaha 9.9 won't start when cold

Fish lake Erie I just purchased this used motor and it will not start when cold. I cleaned out the carb. I have to use my thumb as a choke until it warms up. Once it warms up the crankcase vacuum switch open up, the plunger on the top of the carb goes down and it idles and runs fine. How does the carb choke when cold?? I think this funcion is inop or plugged. Model F9.9LG, Code 6G9L
ser. 302277
Any help would be great!!!

Thanks
2002-04-07
J.B. Cornwell Howdy, FLE.

I agree that the start-enrichment system isn't working correctly. Three bi-metallic vacuum switching valves sense temperature of the block and the ambient air and operate the starter plunger to enrich for starting.

You sa
2002-04-07
Fish lake Erie Thank you for the quick reply. I was using my thumb to restrict the air to force a choke. the piston is up when cold and goes down when it has warmed up. Its's in the up position that there is no richness coming for the passage it is suppose to be coming from. I'll have to let the carb soak and hope what is ever blocking the passage becomes free. Ill have to thank the guy that stored the motor without draining the carb.
I'll let you know how I make out.
Again,Thanks for the help.
2002-04-07

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