I have a 2000 225 Promax with a new Sporty, new poppet valve, new water pump and new t-stats. Engine will warm up fine and idle in the 140's according to the guage. Now the problem. When I just have the motor in gear and it is at idle the temp is fine. If I give it some gas to get the rpms up around say 1200-1500 like in a no wake zone or I come off plane and just looking at a spot to fish, the temps will start to climb. As soon as I get back up on plane they will stabilize again. Now part 2. When I start to air it out and get up around WOT say 5800-6000 the temps will slowly but steadily start climbing again. No horns or warnings but something can't be right. PSI in gear at idle is 2-3 and wot is 14-15. I am not sure what is happening. The motor is on a XB2003 set about 1/8" above pad w/ manual plate.
When I give it gas to get on plane I have a really bad vibration/rattling noise. It is coming from under the cowling and only does it at a certain RPM. As soon as you get blow that RPM or go above it the noise goes away. I can't find anything loose and have checked everything I can think of. Anyone else have this problem or ever heard of it?
Thanks for any help guys.