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1989 Yamaha 99hp 4Stroke starting problems

I

imac

New member
My motor came with the boat pu

My motor came with the boat purchased 18 months ago and runs very well but is difficult to start at the first launch. After that it starts first go at the touch of the key-start.
If I use my thumb over the intake port similar to a manual choke it normally starts first attempt upon launching.
I don't normally run it dry at the end of a trip (being a 4-stroke) and I generally notice that it smokes quite a bit after starting.
My marine mechanic says that the auto-choke is working but I have my doubts due to the starting procedure used (thumb.
Can anyone give me a clue about a possible solution to this problem.
Thanks in advance
Imac
 
"Did the thumb trick on a bran

"Did the thumb trick on a brand new motor last fall.Owner bought the motor last spring, put it on the boat and left gas in it all summer and never used it.It cleared up after running for a while.My suggestion is to clean the carburetor.The jets are very small and plug up easily."
 
Hi London marine and thanks fo

Hi London marine and thanks for your reply.
Sounds like you are suggesting stale fuel.
After cleaning the carby what if anything would you suggest I do to prevent recurrence?
My motor would not go for more than three months (max) without being started.
Again thanks for your input.
Imac
 
It is the same for all motors-

It is the same for all motors--- Run the fuel out of the carburetor if it is not going to be used for a couple of weeks.
 
"just run seafoam
i have seen

"just run seafoam
i have seen gas sit in carbs for 6 months with seafoam, runs perfect and no gummed up carbs"
 
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