Full throttle

[Tony.B]

1995 Johnson 50 hp starts idles fine when giving full throttle misses, no power acts up. and carries on.

[boats.net]

Try bumping choke or pumping fuel primer bulb to see if helps. May need to run a compression test to see if all cylinders are even, check to see if all cylinders are firing, may need to remove and clean carbs.

[Tony.B]

Thanks for the reply...bump the choke when it was doing it and pumped up ball did not help, both plugs are firing ( new nkg bpr7hs ) compression test on both cylinders read 10 was thinking of running thru 1 gallon of 50/50 gas and seafoam mixture at high idle any other thoughts besides carb rebuild.

[NautiBuoys]

For starters, lose the NKG spark plugs and get the correct Champion plugs that engine calls for...

[Tony.B]

Thanks but no thanks Buoys bin running nkg since new 1995,not here to get in a plug debate !!

[boats.net]

Might use a timing light to see if it's an ignition problem and which cylinder is misfiring.

[NautiBuoys]

"Thanks but no thanks Buoys bin running nkg since new 1995,not here to get in a plug debate !!"

Its not a debate but documented fact that OMC products were specifically designed and engineered around Champion spark plugs. You are not doing yourself any favors by using NGK plugs in that motor. I run NKG in my Yamahas and they are great plugs-for that application. Google it yourself if you don't believe me.