ORIGINAL: ScienceisCool
It is pretty hot when it stops running. I put some water on my finger and it will sizzle on the top of the motor.
Richen it up. It should NOT sizzle on the ends or top of the fins. That is too hot and indicative of running lean on the high speed needle.
While you are <u>learning how to tune</u> an engine, always make sure you have fuel with at least 1/3 castor. If you want to switch to all synthetic later on, go for it. Personally, I still use some Castor in all of my engines. It stains, but it's cheap engine insurance.
jack