Nick,
You're right, my mistake. Since the probe generates it own current, it would drop if the probe were bad.
Rich,
That gets us back to the carbs. If you have a single carb engine, check the intake manifold gasket on the hot cylinder side for air leaks. If you have dual carbs, carefully remove the bowl from the hot side without spilling any fuel and remove the floats. Measure the distance from the fuel to the top of the bowl. It should be 1/2". If it is low, you may have a clogged float valve. Unscrew the main jet and needle jet and check them for clogging. They are easy to clean with a toothpick or piece of copper wire. Don't use anything harder or you may damage the brass jets. If all is good there, pull the carb out out of the boot and remove the boot. Flex it all around and check for cracks. Sometimes they are hard to see unless you pull the boot off. All of these things can cause high temps.
To clean the float valve, you will have to remove the carb, the float arms, and drop the viton tipped float valve out. all the other stuff is easy.
If you are not familiar with carb maintenance or rebuilding, Go to the California Power Systems-Airwolf website. click on Rotax engines and parts on the left side of page and then click on Tech Articles. Lots of good stuff there on carb maintenance.
Bill.
