2001 150 Mercury jumps when in forward gear

trophy91

trophy91

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Joined
Sep 12, 2009
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Yesterday when I took my boat out two problems arose. One had to do with the fuel system which made the motor lose power and vibrate the boat the more I advanced the throttle. The other was when I put it in forward gear and started to go forward after about 50 to 100 ft the motor would jump once almost like it was kicking into gear and then it would be fine. I fixed the fuel problem by installing a new separator, filter and a new gas line. It has plenty of power now and no Vibrations. After taking it back out it still has that jump/bump in forward gear but only after going a little ways then it happens. Can anyone give me any ideas? do you think it could be the gears locking into place? If so how do I fix it? Its never happened before until the other day.
 
C

CharlieB

Vice Admiral
Joined
Apr 10, 2007
Messages
5,617
Re: 2001 150 Mercury jumps when in forward gear

Two tests

First, with the key OFF< and the lanyard PULLED OFF, shift into Forward gear, and STAND on the left side blade of the prop turning the motor. Does it turn the motor without slipping, clunking, firmly locking into gear?

The problem may not be the gearcase or shift cable adjustment.

Pull the spark plugs and inspect them for carbon accumulation, is there enough one one or more plugs that may be causing it to short or misfire until it 'burns' clear enough to fire for a while?

Replace the spark plugs with new plugs and retest acceleration, if cured, then you should pull the airbox cover and observe the carb throats (NOT running) while you pump the primer bulb, watching for even the slightest amount of fuel flooding in any carb which could cause spark plug fuel fouling at low speeds, yet burn clear and operate acceptably at WOT.
 
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