bansheedemon Posted May 22, 2013 Report Share Posted May 22, 2013 So i was told my banshee was a 397, but i took a camera in and looked at the pistons and the writing on pistons were 3m065. Which im assuming it means its bored to fit a 65mm piston? i dont know what the 3m means though.Thoughts? And bored to a 65mm would make it a 358 correct? Quote Link to comment Share on other sites More sharing options...
toytech Posted May 22, 2013 Report Share Posted May 22, 2013 65mm bore and a 4mil crank make around 397cc. Quote Link to comment Share on other sites More sharing options...
bansheedemon Posted May 22, 2013 Author Report Share Posted May 22, 2013 that would be nice. But im assuming no way to check crank without tearing into it? i have ridden stockers and.its.considerably faster than a stock shee. And anyway to tell what brand pistons? Quote Link to comment Share on other sites More sharing options...
Starwriter Posted May 22, 2013 Report Share Posted May 22, 2013 Poke a pair of calipers down the spark plug hole and measure the stroke. If you don't own calipers, use a stick. Quote Link to comment Share on other sites More sharing options...
bansheedemon Posted May 22, 2013 Author Report Share Posted May 22, 2013 Ill give it a shot when i can. Any chances the 3m is for a 3mm stroker possibly? i have heard vitos makes one. I looked up the number on the piston in google and got nothing. Quote Link to comment Share on other sites More sharing options...
Starwriter Posted May 22, 2013 Report Share Posted May 22, 2013 Pistons don't have anything to do with the stroker. There's long rod pistons and short rod(stock length) pistons. Quote Link to comment Share on other sites More sharing options...
bansheedemon Posted May 22, 2013 Author Report Share Posted May 22, 2013 I know. The numbers on top just look like they were put there by the builder. Just didnt know if it could.be a reference. It was supposedly professionally built. But i wouldnt know since.i didnt have it done. I trust who i purchased it from, but without a build.sheet its.hard to know.what you really have. Ill try and figure out stroke when i have a chance. Quote Link to comment Share on other sites More sharing options...
blue97shee Posted May 22, 2013 Report Share Posted May 22, 2013 the 3m may be whats left of the wiseco number. 513M65.00 Quote Link to comment Share on other sites More sharing options...
blue97shee Posted May 22, 2013 Report Share Posted May 22, 2013 or 513m065...sorry Quote Link to comment Share on other sites More sharing options...
oldskool Posted May 22, 2013 Report Share Posted May 22, 2013 prolly says 513mo65(stock wiseco piston), but it can still be a +4 mill crank with short rod making a 385cc Quote Link to comment Share on other sites More sharing options...
bansheedemon Posted May 22, 2013 Author Report Share Posted May 22, 2013 The numbers are all the way across piston. No more room for other numbers. Ill look into it more and measure my stroke as well. Quote Link to comment Share on other sites More sharing options...
bansheedemon Posted May 25, 2013 Author Report Share Posted May 25, 2013 I did a compression test and both were right about 175psi. Whats the compression for a 4mil stroker roughly? Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted May 26, 2013 Report Share Posted May 26, 2013 you have to measure the stroke. You cannot tell what length rod your crank is based off of compression as I can take a stock crank and rechamber the head, or get an aftermarket head with interchangeable domes and make my compression the same as your. Shit, my stock stroke 350 dune/play port motor had 172 psi on each cylinder with 19cc domes. Quote Link to comment Share on other sites More sharing options...
bansheedemon Posted May 26, 2013 Author Report Share Posted May 26, 2013 Gotcha. I have been trying.to measure my stroke. But its being a pain in my ass. Keep messing it up, and getting different readings. Quote Link to comment Share on other sites More sharing options...
Starwriter Posted May 26, 2013 Report Share Posted May 26, 2013 Gotcha. I have been trying.to measure my stroke. But its being a pain in my ass. Keep messing it up, and getting different readings. Take the stator cover off so you can precisely turn the flywheel. Quote Link to comment Share on other sites More sharing options...
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