themudgician Posted September 2, 2008 Report Posted September 2, 2008 i just tore the head off this banshee it has a 21cc cool head pro design, the pistons are .060 over the cylinders look real good i got 135 psi cold kicking with throttle wide open on both cylinders.the guy i got it from said it was just reringed should i rering it or is that good. he also said it was .010 over and its not. thanks guys for your help im 2 stoke stupid Quote
dajogejr Posted September 2, 2008 Report Posted September 2, 2008 i just tore the head off this banshee it has a 21cc cool head pro design, the pistons are .060 over the cylinders look real good i got 135 psi cold kicking with throttle wide open on both cylinders.the guy i got it from said it was just reringed should i rering it or is that good. he also said it was .010 over and its not. thanks guys for your help im 2 stoke stupid What kind of compression gauge, and more importantly....what is your elevation at? Quote
themudgician Posted September 2, 2008 Author Report Posted September 2, 2008 What kind of compression gauge, and more importantly....what is your elevation at? snap on and 700 feet above Quote
deerekillr Posted September 2, 2008 Report Posted September 2, 2008 I'm no expert but that sounds about right. 21cc head gives you stock compression. Stock compression should be about 130-135psi regardless of size of pistons. No port job or anything. Looks like your in good shape for what you've got. Put it back together and ride! I'm sure some more seasoned guys will jump in shortly. james Quote
dragbanshee Posted September 2, 2008 Report Posted September 2, 2008 Im 800 asl with 21cc domes 150psi both cyl noss head, 135 isn't bad I wonder what it would be with stock head, because mine raised 25psi with the noss head so could it really be low? ......Dave? Id still put it together and ride it. Quote
bigboybanshee Posted September 2, 2008 Report Posted September 2, 2008 21cc head gives you stock compression. Stock compression should be about 130-135psi regardless of size of pistons. I'm sure some more seasoned guys will jump in shortly. james Stock compression will vary depending on elevation. Stock for me at 400 feet above sea level is 120psi. When I ran 21cc domes in my NOSS head it bumped the compression to 150psi...21cc domes IMO are better categorized as safe for pump gas rather than saying it'll give you stock compression readings. 22cc domes should be closer to stock :thumbsup: Quote
themudgician Posted September 2, 2008 Author Report Posted September 2, 2008 Stock compression will vary depending on elevation. Stock for me at 400 feet above sea level is 120psi. When I ran 21cc domes in my NOSS head it bumped the compression to 150psi...21cc domes IMO are better categorized as safe for pump gas rather than saying it'll give you stock compression readings. 22cc domes should be closer to stock :thumbsup: what kind of compression would i be lookin at if i went with a 19 cc head Quote
dragbanshee Posted September 2, 2008 Report Posted September 2, 2008 what kind of compression would i be lookin at if i went with a 19 cc head You wouldn't be able to run pump gas. Quote
bigboybanshee Posted September 2, 2008 Report Posted September 2, 2008 what kind of compression would i be lookin at if i went with a 19 cc head Not sure, that's a good question for whomever cuts the domes for you :thumbsup: Quote
themudgician Posted September 3, 2008 Author Report Posted September 3, 2008 ok thanks alot for your input Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.