mystery port

[noonansar]

I recently bought a banshee for parts. When I pulled the engine and tore it down I noticed that the cylinders had been ported. It is a decent looking job, the cuts are even and clean. After reading here and researching I found that the intake and exhaust ports are cut similar to a dune port, but the transfers are entirely untouched. Just wondering if these are worth running and if they will make and decent power difference since the transfers are stock. Any help is appreciated

[James_21]

Post some pics so people can get a better understanding.

[noonansar]

I have had bad luck trying to post pics on here but I will try in a bit. I forgot to mention that there are no markings on cylinders or else I would have contacted whoever ported them.

[camatv]

transfers are where the big power is.    if the bore is good and you have pistons and your just wanting to get a motor together to ride.  run em

[noonansar]

That's what I was afraid of. I have a really good running stock port motor now, really no need to freshen it up. I just figured if these cylinders would give me a good boost in power I would swap them.

[noonansar]

here are a couple of pics of the intake and exhaust ports

[noonansar]

.

[lms1977]

If you can get a good measurement from the top of cyl to the top of exhaust port. As a reference as to how high the port was raised as long as they did not go to high which does not look like they went hog wild they might give ya a nice little bit extra. All depends what ya really want out of it.

[noonansar]

I am hoping for some better mid range and top end. I paid 50 bucks for a complete 87 banshee not running and these were on it, so if these cylinders will run good without any transfer porting it is a bonus. Just trying to decide if it is worth the effort to swap these out and re-jet. My digital caliper wont fit inside my cylinder to get an accurate reading. I will try to measure it tonight and post the results.

[noonansar]

The top of the cylinder to the top of the exhaust port is 28.5mm and 45mm wide measured straight across on a 65mm bore.

[noonansar]

Did some more measuring.

 Exhaust: 28.5mm from top of cylinder to top of port, 71mm from bottom of sleeve to bottom of port, 45mm wide measured straight across.

 Intake: 71mm from top of cylinder to top of ports, 25mm from bottom of sleeve to bottom of ports, 50.5 wide measured straight across.

Where can I expect power with these and how much compared to my current stock port cylinders considering transfers have not been ported. I am currently running dmc 916s, vf3 reeds. +4 timing, milled .030 stock head, pwk28 with uni pods, at sea level on 93 octane pump gas.

[shakar]

shoot you can keep the juggs and ill even give your 50$ back. for the rest of the ole 87 ..ill even come get her.. goodluck

[Larry's Shee]

Here I thought it was going be something special