99 MODEL 4 STROKE MERCURY 40

E

eskimo man

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Jun 7, 2006
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WHATS THE PROBLEM WHEN MY MOTOR IS BOGGING AT ABOUT HALF THROTTLE AND KIKCKS-IN AT NEAR FULL THROTTLE?
 
WillyBWright

WillyBWright

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Dec 29, 2003
Messages
8,200
Re: 99 MODEL 4 STROKE MERCURY 40

Maybe some varnishing. It doesn't take much on 4-strokes. Add a Gumout sort of thing to the gas and hope for the best.
 
B

bleew0

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Aug 14, 2008
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Re: 99 MODEL 4 STROKE MERCURY 40

I have a 30 four stroke I think it is the same with different carb setup but i have been having the same problem for a few years mine is a 1999 also. It recently got worse and now has compression issues. I am wondering if it may have been some kind of defect with head gaskett. I have cleaned carborators multiple times. I am about to check cause of current problem.
 
B

b-boof

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Joined
Apr 7, 2009
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1
Re: 99 MODEL 4 STROKE MERCURY 40

I have been having similar if not the same problems with mine. I rebuilt the carbs and it still had the issue of bogging mid throttle, but idling and full throttle it worked fine. I have spoke with a merc technician and he said I would have to sync the carbs to rule out anymore carb issues.
 
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