Hello Everyone.

Ive managed to get my self a Toro 25.4 cc engine,

My questions are:

1.- Ive read that porting this engines would help improving power to weight ratio, is the improvement achieved significant, on a 25cc engine how much RPM would they normaly increase?
2.- If I understand correctly what has to be done is to make deeper and wider the intake ports of the engines, but how far should I go?
3.- Another thing to be done is to widen the exhaust port sanding only on the down and on the sides (not on the top of it), Im I right?
4.- Should intake transfer porting be done with the Moto Tool with a grinding stone, or how do you do it?


Sorry for so much question but I have never port any engine and from what I´ve listen at my flying field if you go to far porting you will end up with and unusable engine.

I fly at a very high altitude in México city so engines are quite impacted on their power output so these would be a great fix for my engines.

In advances thank you very much

Best Regards
VÃ*ctor.