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50 hp fuel primer

justkenny

New member
I have a recently purchased 20

I have a recently purchased 2002 50hp. The carbs were gummed up. I cleaned and now the only way the engine will run is with the manual prime on. Any suggestions on how to check the automatic prime?
 
"Ken,

If the engine runs on


"Ken,

If the engine runs only when the manual prime is on, I would say that the problem is not the manual prime. More than likely, there is still some trouble in the carbs. Yamahas have very tiny fuel orifices, especially the idle jets and can be tough to clean out properly. You have to remove everything to properly do the job. Use a welding tip cleaner to clean the jets. Actually on Yamahas and other Japanese engines I use the dental tools that they use for reaming out a root canal on the idle jets. That is how tiny they are.

Tony"
 
"recleaned the carbs, still ha

"recleaned the carbs, still had a problem. I started the engine and manually engaged what I think is the linkage from the computer to the carbs. Spar advance mabe? Pa Ya she took off and has run great since. Go figure? Guess something was sticking on this."
 
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