first off, im not gonna go running off and destroy my engine juuust yet.
i did read the wiki bit on porting a motobecane, and it is far from a complete guide. it is totally just specifications for people who already know exactly how to do everything involved. so my questions are....
when it says "Raise" as in the exhaust port.... what exactly does that mean? =P do they want me to shave 3 mm off the top of it and then weld 3mm of steel under that so that its exactly the same size, just physically "raised"?
what does it mean by remove all material directly below the window on the piston?
does anyone know of a guide that will give a bit more detail and maybe sort of a step by step on how to do porting in general? or at least specifically to small engines or 2-strokes or whathave you?
and finally, if i were to do the intake, exhaust, and piston modding, what kind of performance gain is usually expected on a 50v engine? (and ever since i put that dellorto sha 14:12 on there my top speed has gone down from 27 to 24 or so :(. )
thanks for any advice you can give me!