Kohler generator overheating

[Greg Young]

Hi -

Our Kohler generator is overheating under load. So far I've replaced the
thermostat, and so I guess that flushing the system is the next step.

Details:
86 PT-40
Kohler 12.5CCO67-RV
Yanmar 4-cyl engine
with no load ran cool. Started adding load at around 180 degrees
Added load up to 20A leg one, 30A leg two - all three cruise-air AC's running
plus some other appliances. Maintained about 115V all the time.
Temp slowly climbed up to about 215 before I took the load off. In the past it
actually tripped the high temp switch, but I didn't see any point in doing that
again.
After I took the load off it slowly dropped to around 200. Stopped it then.

We've got two weeks before we head to the desert and 100+ heat. Any thoughts
would be appreciated.

Thanks!
Greg Young
1986 PT40
Escondido, CA
(760) 807-1727