Pulled the cylinder to do some more porting again. This time I opened the exhaust port horizontally a little. I’m not doing exact measurements here, just sort of eyeballing it, but i think I went 1mm or so in each direction. I shot a comparison between the ported cylinder and another stockie I have lying around. Top is ported, bottom is stock.

Big improvement on the top end. Once the pipe kicks in, it just keeps going and pushing. I hit 32mph before I ran out of road, but it felt like I could get a mph or 2 more out of it. Where it used to choke out at 29-30 mph, now it feels like it can stay up there and get out a little farther. I’m thinking of trying the intake port next, but it’s easier to brick it if I mess that up from what I’ve read. Might try opening the exhaust port a little more again.

This is all with a 12 bing and intake, by the way.

I accidentally installed the head wrong and left the decomp hole uncovered, so that made for a smoky cylinder when I took it off.