1969 johson 55 hp running hot

T

transamjegs

Cadet
Joined
Sep 3, 2010
Messages
24
boat gets hot after 5 minutes of full throttle but doesnt get hot half throttle and below. what is causing this?
 
B

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Re: 1969 johson 55 hp running hot

First thing to do is check your water pump.
 
T

transamjegs

Cadet
Joined
Sep 3, 2010
Messages
24
Re: 1969 johson 55 hp running hot

water pump seems to be working. i have ran it for hours today on half throttle and never got hot. its only at high speeds for extentsive periods of time.
 
B

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Re: 1969 johson 55 hp running hot

When's the last time it was replaced ?? They do ware out.
 
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