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1979 40HP mercury Thunderbolt help

curtito

New member
"I have had this engine for a

"I have had this engine for a year. it runs good and idles well. can be hard to start, but my problem is once I get it started it takes about 25 mins of running before i can even get it to go above 3mph. Once it warms it just goes all of asudden and no problems thereafter. I Have replaced the carb and gasket, solenoid, choke, fuel pump gaskets etc. Any ideas of what else to look for that would cause it to take so long to warm up or what could be the issue?"
 
if the motor has some sort of

if the motor has some sort of temp. regulator that controls the volume of fresh water entering the system & it is not functioning properly. could be stuck open.
 
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