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1979 115 johnson will not get up on plane low power

david

Member
" I just bought this boat and

" I just bought this boat and the first time I took it out on the water it would only get up to 2500 rpm. Checked fuel pump and filter and it looked fine. Checked compression and found them to be 120 115 115 95. Spark appears to be good. What should I look at next. I have had it out on the water 5 times and every time it's the same problem, no power. At very low throttle it runs a little rough. Idle is close to 2000 rpm. Please can someone help me?? "
 
"David..... You have a differe

"David..... You have a difference of compression between the lowest and highest reading of 25 psi which spells trouble. Remove the cylinder heads so that you can inspect the pistons, cylinder walls, sealing surfaces of the heads and block, and of course the gaskets.Let us know what you find.

Joe (30+ Years With OMC)"
 
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