hi all, i have a mega mf.12 ceramic ( hand tuned, made by nova rossi ) i run it about 3.5 liters now.

yesterday i had a club meeting and started the engine up for the first qaulification, in the begin the motor run pretty rich, so whe leaned the engine and it whas getting much better, temperature whas also good, after that i had the final.

after starting the motor for the warmup, the engine whas running verry rich again, and temperature whas pretty high, so we puth it richer on high needle and leaner in under needle. buth it didn't help, does anyone know what to do?

in low rpm the motor whas running so rich that it didn't even drive, so we leaned it and it went better, when it commes at higher rpm the engine whas getting faster like it used to be. i changed the plug already buth didn't help.

can anyone help me? sorry for my real bad english