Or not as that's a shockingly bad article. Half of it's wrong. There's a mini guide at the bottom here. http://www.scootershack.co.uk/125tuningguide.html
most are portable, but some top end kits come pretty much as ported as possible, but im sure minor would still give them a good seeing to.
LOOOOL..... i just a digusting thought of what he did to my cylinder because of that comment :wtf: CHEERS slayeh^ lol :rtfm:
oh yours got a mini raping james.... square port, round stub, has to match somhow ever seen a square circle?
From what I remember from the Goped world, porting is when you take a standard engine, strip it to pieces. Then with experience and a cutting tool, you shave the excess metal from the intake port, exhaust port and transfure ports. The intake and exhaust port have to be either raised or lowered, cant remember which one is which. But the transfures are made wider so more fuel can pass through. Also, some people will slightly mill the piston to reduce the chance of seizure. I'm pretty sure this applys to almost all 2 stroke engines where'ever its a 25cc goped or moped. Correct me if im wrong.
im samjac68 off psuk, ahh remember the days of spending £600 on a goped that did 15mph LOL