SlowMoe

It wont change the timing that much, but should give you maybe 5hp or so on the top end. While you're at it, you can widen the port by about 1-2mm on each side. You can raise the corners of the exhaust port roof about 1-2mm more than the center, essentially making it flatter. Kinda like this:

Not sure. Possibly to reduce cranking compression. Or maybe broaden the powerband

What do you think about this exhaust port shape?

So without running a lockup/ super aggressive tires, would it be worth running race gas on a duner (would I be able to get the extra HP to the ground)?

Yeah im not talking all out drag frame etc. Like your average stock cylinder bike with a drag port n alky

It's gonna be a 7 mill cub. Probably 50/50 dunes/drags I know it's not going to be the fastest but if I am faster than sa a fully drag ported stock cylinder bike I would be content

It was a helluva deal lol. I had to hurry and get my money back out the bike so momma didn't bite my head off. Still got a full roller including plastics, an extra full set of sand tires, tranny/ cases/ clutch/ ignition and a set of 35 flatslides with filters and billet intakes for my cub build. I got the thing for a steal

Crank and cylinders SOLD

So you are saying that window size is more important then runner size?

On, for example, a 4 mil serval/ cub.... What kind of difference in HP can you expect going from pump gas domes to race gas domes?

Cool

Are you talking about a flat roof with the exception of radiused edges? If so what would the minimum radius be with, say, a 75% port? Pics?

Yes

Crank and cylinders still up for sale, will sell the set for $250 and will throw in the bumper for free you just pay the ride

Thanks. I was gonna say the same thing lol.

No. The crank and cylinders were never ran..... The guy that put it together used standard pistons and they smacked the head first kick. So he tore it down to inspect everything and proceeded to sell me the bike. I am selling everything that doesn't coincidenwithba 7mill cub build

Thanks and sorry brother I don't at the moment

Pipes SOLD!!

And what about roof shape? How flat is too flat

75%?

Its fairly common knowledge that the transfer ports quickly become the bottleneck once you've opened the exhaust up so much. My question is, is the main botttleneck at the windows or in the runners?

NERF BARS SOLD

Prices do not include shipping. I do not come on here often so just call/text 337-580-8044. I prefer local pick-up but may ship depending on the item AC pro peg nerfs in pretty good shape $100 AC Bumper $40 Hot rods stock stroke long rod crank $200 Ported, freshly bored 66mm cylinders with zero hours.... I believe these were ported by FTZ, not positive but the porting is very smooth and symmetrical, they are NOT drag ported and I am not 100% sure what kind of port job they have. The exhaust port measures 1.115" from roof to deck and the transfers measure 1.730" from roof to deck.......$200 Complete set of plastics including hood $200 Toomey T-5's in decent shape, should clean up real nice $275 Full set of wheels and tires/ Fronts have ITP holeshots with damn near full tread, rears have Maxxis Razor tires and have >50% tread on them. $100 for the set PICS!! Pic Nerfs Bumper Tires Plastics Plastics 2 Crank Juggz Juggz 2 Juggz 3 Forgot to add....stock stroke long rod crank is brand new and is trued and welded!!!!! get it for a steal Tyres Jugs.. I believe they have cool head studs installed. These things should rip! Long rods

No, I havent

Could it be the pickup thingy going out?