80's Mercury 50hp reving great but when in gear has little power. Please Help

JinxyTog

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Joined
Aug 9, 2013
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2
Hi all

I'd first like to say thanks for all the amazing information on this forum. It does look a great community.

I recently purchased a nice little 14' speedboat with a Mercury 50hp outboard. I've gone out 4 times now and when we first get in the water the boat pulls well. Gets to 25knts for a few minutes then the power drops and only get about 6knts. When I drop the power down I get the same speed and when I go full throttle a little more noise and no more speed. If I take it out of gear the engine revs the full no problem but when in gear nothing but a sluggish output.

I've had a marine engineer look over it and ignition is fine, compression good on all 4 cyl. New fuel as I did have water in the last lot. Water pumps fine etc.

Very frustrating this as everything is fine on land and out of gear but the 30 mile rould trip to test it in the water is becoming tedious!! Could this be the gearbox???

Thanks in advance
Jon
 

JinxyTog

Recruit
Joined
Aug 9, 2013
Messages
2
Re: 80's Mercury 50hp reving great but when in gear has little power. Please Help

BUMP!!

Is there anyone who can please help with this?

Thanks
 
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