Looks like your head is a big bore head. Since you said you measured the bore and stroke and it came out to 49cc (its actually 48.3cc to be exact), I would definitely say you have a big bore head that came stock with your engine. Congrats.
Port the side opposite of what you listed. Actually, I wouldn't port the big bore head anyhow. The ports is big enough. If you put an IP2 pipe and CF reeds, you'll get about 12.2-12.4K rpms without even doing any porting on that head. AND that's also with a stock carb rejetted with a dellorto jet. This is a setup I have on one of my cags. Its reliable, pretty much bulletproof, starts on the first pull, and has a lot of low end torque with great top end speed.
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Originally Posted by redbackalarms I just ripped off the barrel off my full fairing cag. I measured the bore and stroke, 44mm x 33mm and figured it's 49cc. Now my question is on porting the transfer ports. From the majority of the threads I have read porting looks like it has been done on mainly 39.6cc motors. By the looks of my barrel there doesn't look like there's much meat to massage. How far down the transfer ports do you port. I have marked out 3mm on the flater side of the tranfer port to widen but looks like I can only carry this down only about 7mm. If I go any further down i'll probably blow through. Even if I do all this work, does'nt the crankcase also need work. If a sandwich the barrel on top of the existing crankcase port it will defeat the purpose of porting, as it is going to be smaller. Does all of this sound correct if not I need some guidance. |
