Bogging engine when gently applying throttle

dorsett59

Seaman Apprentice
Joined
Jun 4, 2008
Messages
49
Hi, all.
I have a 1979 Mercury 70hp outboard that sat outside for "a while" before I bought it last year. I've been tweaking this and that, and have basically ironed out all the major issues except for one.
When taking the boat out, the engine runs fine from idle to about 2100rpm. After that, the engine bogs down to nothing, and usually dies. However, if I firewall the engine very quickly, the engine can cough once, then go like stink.
The engine sat for a while, and I've been running carb/fuel injector with the current gas (try the easy stuff before the expensive stuff).
I was wondering if anybody else has had this issue, and what it may have been. Could be a mixture issue, carb jet issue, an accelerator pump issue, or a timing issue.

Thanks in advance
 

coolguy147

Commander
Joined
Jul 14, 2008
Messages
2,817
Re: Bogging engine when gently applying throttle

wouldnt run if timing was off

clean carb
check compression'
check spark
rebuild kit for carbs
new water impeller
so on from there but first thing first water impeller
 
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