It is nice to see the service is so good! IMO.... it is best to ready the engine for racing prior to it's first run rather than waiting for the inevitable failures from our torture test....


1) - take the carb spring out... you will swallow it when the barrel falls off... clean the carb real good and use a little blue loctite on the barrel set screw

2) - Replace the rear brearing with a quality bearing such as those that Shadel sells for Nelsons... cheap insurance IMO as using the stock bearing is a crap shoot even though some claim they will not fail if broken in just right....

3) - Pull the piston/rod out and remove the wristpin.... clean all very well with denatued alcohol... and replace the wrist pin while using red-loctite to prevent the pin from floating around(it is a loose fit) and eventually egging out the hole and ruining the piston. Wipe off the excess loctite let dry and reassemble motor.


None of these changes will increase the RPM at all... they will only ensure the engine will run well as long as possible... which... these TT PRO40's are quite surprising how well they will run well for a $70 motor!


Dan