Honda runs cold 15 hp

[SOUTH KATTAWAGAMI]

HAVE 1984 4 STROKE 15 HP HONDA RUNS COLD DOES NOT HEAT UP AFTER HOURS ON THE LAKE SOMEBODY TOLD ME NEED A HOTTER THERMOSTAT THE SUPPLIER ONLY SHOW ONE TEMP RANGE AND MAYBE A 90 HP WILL WORK BECAUSE THEY ARE HOTTER ?ALSO THE ENGINE DOES NOT IDLE DOWN TO PROPERLY TROLL WALLEYE

 

[hondadude]

Have you checked your thermostat? It may be stuck open. If it is stuck open, the motor will never come to temperature. To idle correctly, the motor needs to get to temperature...but I guess you probably know that already. Get it to temperature and your idle problem may be solved too.

I am not sure a 90's thermostat would fit.

I would not install a different thermostat unless you are running in really cold water.

If you are doing mostly idling with this motor, you may want to use NGK DR5HS spark plugs. They are one step hotter and will stay cleaner than the DR6HS plugs that the motor is supposed to have.

Mike