cheeta Posted January 8, 2009 Report Posted January 8, 2009 me and my buddy both have 2003 banshees he has been driving his since 2003 and never rebuilt it yet and i just put a crank and new cylinders and pistons and rings about 40 hrs of driving ago. we both did a compression test at the same time and his said 21psi on 1 sid and 20psi on the other mine read 18psi on both. we both have all stock engines with just fmf pipes, jetted, k&n, and reeds. shouldn't i have more compression where i just rebuilt mine? Quote
bansheejoel Posted January 8, 2009 Report Posted January 8, 2009 bro that thing wouldnt even run at 20 psi lol. stock i think is around 130 at sea level. Mine has about 30hrs and im at 125 at sea level Quote
cheeta Posted January 8, 2009 Author Report Posted January 8, 2009 bro that thing wouldnt even run at 20 psi lol. stock i think is around 130 at sea level. Mine has about 30hrs and im at 125 at sea level oops i ment his was 120 and mine was 118 Quote
wacko2000 Posted January 8, 2009 Report Posted January 8, 2009 lol.. What kind/ type of compression tester are you using? Are you kicking until the needle stops moving? Like stated, the bikes wont run with that low of compression. Something is wrong here. Quote
AKheathen Posted January 8, 2009 Report Posted January 8, 2009 oops i ment his was 120 and mine was 118 u guys using the same oil? Quote
cheeta Posted January 8, 2009 Author Report Posted January 8, 2009 u guys using the same oil? yup we pretty much share a gas can Quote
BellicoseBanshee Posted January 8, 2009 Report Posted January 8, 2009 Improper break-in could account for the less than desireable top-end results... :ermm: Quote
cheeta Posted January 8, 2009 Author Report Posted January 8, 2009 yeah i honed the cylinders and put newpistons, rings, wristpin and wristpin berring Quote
bansheejoel Posted January 8, 2009 Report Posted January 8, 2009 yeah i honed the cylinders and put newpistons, rings, wristpin and wristpin berring sounds like a nice top end job to me.......what is your elevation? The higher you are the less it will be Quote
BlasterKX Posted January 8, 2009 Report Posted January 8, 2009 hate to whore your thread but mine is at 118ish at 530 above sea level. has pipes and reeds. does that sound normal? Quote
tony cub Posted January 8, 2009 Report Posted January 8, 2009 dont forget to open throttle when checking conpression. Quote
lt1bird Posted January 9, 2009 Report Posted January 9, 2009 Dont forget to do the test with the engine warm Quote
AKheathen Posted January 9, 2009 Report Posted January 9, 2009 yeah i honed the cylinders and put newpistons, rings, wristpin and wristpin berring if you went std. then the clearance could be more than his, causing a miniscle amount of difference. there is nothing wrong with it, good topend job, and 2psi varience is nothing to rack your brain over. you could have more than that much differenc between right and left, and be perfectly fine. also gaskett thickness can effect it too. the new pistons cold have slightly higher wristpins, carbon buildup, etcetera. good manufacturers usually match the pistons in sets, but as a whole, they vary a bit. this us one factor in blueprinting an engine, so you can acurately calculate a build, and bolt on parts, knowing they'll match perfectly. Quote
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