Grinder
i have been running in one of your 2008 353 and on the last 750cc on your break-in it is running at 125 degrees Celsius "257 F" running on 16% nitro 12% Castor with a extra .1 shim on the head.
could it be the motor is still to tight cold or could a early clutch and 2 speed be causing the heat in the motor. the motor is really rich.
what is the purpose of the other needle that came with the motor.
Peter