Has anyone had success in enlarging the intake or exhaust ports to increase the power output. I bought an OS .12TG engine to experiment with. I have a OS .12XZ Power house engine, and I'm going to use it as a guide to modify the intake and exhaust, and possibly increase to air opening on the carb from 5.0 to 6.5 as it is in the 12XZ.

Anyone's help would be useful.


Thanks
Matthew