Dar Zeelon, does engine overheating have similar effects on the engine as a lean run?

I got a parkfly type with an AP 0.09 and i have recently put a pipe on to replace a long cardboard tube that i made, so the exhaust passes the radio equipment and does not accumulate at the front. I think it could be running hotter and it seems to be happy on the ground but when after i hand launch it, it does not seem happy and i have to land.

Anyway i didn't know that. What are the visible effects of it being overheated. Can you still see a trail of whiteish smoke from the exhaust (castor comming out)?

I also had a similar problem with a la 40 on a trainer that seemed to quit for no reason at about 6 mins in flight. So maybe this problem was related to the amount of fuel in the tank. Im not sure that it quit for being too lean though. The problem was resolved by replacing the fuel lines and checking all things to do with the engine and fuel suppy.