225 SWSII overheat at idle

My 225 SWSII is newly rebuilt with new thermostats,pv valve and waterpump but at idle it overheats--alarm in the control goes off. Engine is idling at about 500 on the MF tach--If I bump the idle to 700 there is no overheat alarm.

What should this engine be idleing at??

Are there other things that could be causing this?


H20SKE

[boats.net]

That engine should idle at 700 rpm's in neutral. Are you running in water or on hose?

I will check it tomorrow in the water in neutral. In gear it is at 500 when it is warm, just seemed a bit low. with it overheating at idle in gear, it just seemed a bit low on rpm.

H20SKE...

Thanks for any help.