New to gas, so bear with me. I bought a used car/engine this year. The engine is a 3 port novarossi, I think its something like an NS12 S1. There is some caked on dust and grime on the cooling head, especially around the base of the head. Could that cause overheating? Is temerature very sensitive to a little grime, or is it only an issue when you get the whol ething coated?
When I tune the engine for what seems to me to be best performance, it runs a little over 250, I think. My pit guy tuned it for me today to cool it down a little by richening it a little, and it ended up around 210, but it felt like it was bogging all the time.
Could this be because the head has dust and dirt on it? Or will a small layer of dirt not effect it?