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Old 06-06-2007, 07:10 PM
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jrm123180 jrm123180 is offline
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help with my boat please

I need help wih my boat please, you guys are MUCH more helpful than the boat forums.

I have a late 70's merccruiser 120 I/O (basicly a 4cyl chevy engine). When I am in the water under load I can not get over 2000rpms.

Tonight I started to pull the spark plugs while the engine was running to see when happened. When I pulled #1, nothing, ran the same, #2, began to die, #3, began to die also, #4 same as #1, nothing happened.

I checked the compression on all cyls. and #1 @ 70, #2 @ 130, #3 @ 130, #4 @60.

Last year I had trouble but while I was out the last time I advanced the timing while I was out and it took off and got up on a plane. (I got the boat at the end of the season with no stern drive and the boat was free).

What could be the problem and where should I look next? Could it be a valve stuck open (I hope not pistons)?

PLEASE HELP....its boating season.

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