[THEFERMANATOR]

Normal operation. It wouldn't hurt to replace poppit valves in the adapter, but what your describing is normal for just about any 2 stroke. A 2 stroke looper engine needs alot of heat at idle to burn the fuel without loading up the plugs, but under a load they need to run cool to keep from sticking a piston. It isn't uncommon for a 2 stroke to run 160-170below 2000 RPM's, and then drop down to 100-130 under load. They have a spring loaded valve of some kind to allow the thermostats to be bypassed once a certain amount of water pressure is reached which there fore drops the engine temps way down. Once the water pressure comes back down the T-stats go back to working again and temps go up.