johnson '78' 6hp loses power then cuts out

russell80r

Recruit
Joined
Feb 27, 2012
Messages
1
My johson 6hp runs all day sitting in a bucket of water at home but when on the water after a minute or two on full rev,s it loses power and then stops.Attempts to start it again works at first and then gets less sucsesful until it wont at all until it has cooled right down(a couple of hours).Spark at plugs,fuel entering carby and evident on plugs,put thumb over both spark plug holes and blew it off on upper hole but not on lower until engine had cooled right down,water coming out of tell tail and exaust. I need to know were to go from here in relation to fixing this problem. Thanks.
 

raczekp1

Lieutenant
Joined
Mar 30, 2010
Messages
1,327
Re: johnson '78' 6hp loses power then cuts out

i think you just overheating motor,check compresion when he refuse to start
what about cooling system, is it working?
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Pontoon24

Petty Officer 3rd Class
Joined
Mar 6, 2010
Messages
88
Re: johnson '78' 6hp loses power then cuts out

Can you duplicate the problem off the boat (running wot with a bigger bucket or barrel)?
Is the motor sitting very low in the water when on the boat? (are the exhaust vents covered?)
 
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