Hi a newbie here so be gentle!! I've got a 96 yam v4 115hp outboard that's overheating when hits 4000 rpm. It started when I didn't start it for 2 months and went out on it increased the revs and the alarm when off and the red thermometer sign came on? When it's cooled down you cruise all day on it along as it doesn't go to 4000 rpm? What I've done so far is inspected my water pump (perfect) , changed the tstats ( old ones where good aswell) ,ran saltaway thru the engine numerous times, checked water intakes (perfect). Had a check about with the temp sensors while running to see which side was setting it off seemed the left side !! Bought a heat temp gun and had it on idle and checked all over the cylinder head for temps and funny enough came up on right side hitting 55 c just above the spark plug , that was the hottest spot with the rest averaging 45 c ? So I was wondering a few things reading about putting rydlyme thru it ? Anyone done this? Anyone know how to properly check the temp sensors to see if they are definitely working? Prv where is it, how to check it?
Is it a simple as cleaning the cylinder heads ( 20 yr old motor thou)
Can anyone point me in the right direction please thanks
Is it a simple as cleaning the cylinder heads ( 20 yr old motor thou)
Can anyone point me in the right direction please thanks