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20hp mariner at full speed bogs intermittenty

B

billbrewco

New member
"starts perfect, idles perfect

"starts perfect, idles perfect, in neutral runs fine at high rpm. water pump fine, new plugs, new ignition system. when run at full speed it bogs down for 10 seconds or so then runs fine, then bog, etc. only way to correct is to reduce throttle and increase throttle, then it happens all over again. 80's model 20Hp 2-stroke, fresh fuel, good tank, bulb, and hose."
 
"pump the fuel bulb when this

"pump the fuel bulb when this happens, sounds like its sucking air or loosing pressure"
 
I had a similar problem with m

I had a similar problem with my '87 45 HP and it turned out to be a bad check valve at the connector to the fuel tank. I bought a new connector at Walmart and now I am good to go....Primer bulb was totally collapsing at higher RPM but was fine at lower speeds
 
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