banshee15 Posted January 17, 2012 Report Share Posted January 17, 2012 what should the compression be--- i have an 87 banshee i just had motor rebuilt all new seals its .40 over Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted January 17, 2012 Report Share Posted January 17, 2012 what should the compression be--- i have an 87 banshee i just had motor rebuilt all new seals its .40 over Depending on elevation and mods....usually a stock internals motor is around 125ish for comp test on average Quote Link to comment Share on other sites More sharing options...
banshee15 Posted January 17, 2012 Author Report Share Posted January 17, 2012 Well I'm getting arouse 85-90 on both sides. Is it possible. That it is losing compression around the cylinder where the exchaust mounts to it ( like where that black oring slides over) Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted January 17, 2012 Report Share Posted January 17, 2012 Well I'm getting arouse 85-90 on both sides. Is it possible. That it is losing compression around the cylinder where the exchaust mounts to it ( like where that black oring slides over) Umm....that isn't ncluded in the compression numbers cause the piston is already ABOVE the exhaust opening by the time the compression really starts to spiike . Did you kick until the needle stops moving? It may take quite a few number of kicks.....also are you holding your throttle wide open like you should? Quote Link to comment Share on other sites More sharing options...
lms1977 Posted January 17, 2012 Report Share Posted January 17, 2012 what thickness base gasket did you use, did you check the piston clearence and ring gap, also what is your squish clearence that seems low for a new topend is it a stock head any porting Quote Link to comment Share on other sites More sharing options...
banshee15 Posted January 17, 2012 Author Report Share Posted January 17, 2012 in 3 kicks im getting between 85-90psi now if i give it arould 10-15 kicks i can get between 110-115psi this motor has just been rebulit board .40 over everything esle is stock that i no off when i bought this four wheeler everything was in boxes so its been a project the only thing im needing right now is a thumb throttle ( i all ready got the cable) im just trying to see if it will start so do i need to get the thumb throttle before i try to start Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted January 17, 2012 Report Share Posted January 17, 2012 You need to be WOT to do a compression test Quote Link to comment Share on other sites More sharing options...
banshee15 Posted January 17, 2012 Author Report Share Posted January 17, 2012 what if i hold the cable open with pair of pilers or something Quote Link to comment Share on other sites More sharing options...
2004LEBanshee Posted January 17, 2012 Report Share Posted January 17, 2012 in 3 kicks im getting between 85-90psi now if i give it arould 10-15 kicks i can get between 110-115psi this motor has just been rebulit board .40 over everything esle is stock that i no off when i bought this four wheeler everything was in boxes so its been a project the only thing im needing right now is a thumb throttle ( i all ready got the cable) im just trying to see if it will start so do i need to get the thumb throttle before i try to start If your around 1000ft that's perfect. You need to kick it till it wollnt go up any more. I warm it up first too. Do you need a thumb throttle to start it? No. If jetted properly you don't need the throttle at all to start it. Quote Link to comment Share on other sites More sharing options...
banshee15 Posted January 18, 2012 Author Report Share Posted January 18, 2012 Also when I do a spark test it only cording about every couple kicks I tested stator an coil they test good. How do u test brain box. Or could it be voltage reculater ( or how ever u spell it) Quote Link to comment Share on other sites More sharing options...
banshee15 Posted January 18, 2012 Author Report Share Posted January 18, 2012 Also when I do a spark test it only fires about every couple kicks I tested stator an coil they test good. How do u test brain box. Or could it be voltage reculater ( or how ever u spell it Quote Link to comment Share on other sites More sharing options...
Burt Reynolds Posted January 19, 2012 Report Share Posted January 19, 2012 Motors should be comrpession tested cold. The throttle most be Wide open ,either by the thumb or by pliers or you will get a false low reading. The most important thing about a psi test as long as its up over 105 or 110 or so is how close they are together in compression. ANy more than 5psi difference in the cylinders and you will have a problem Quote Link to comment Share on other sites More sharing options...
EvilBanshee Posted January 20, 2012 Report Share Posted January 20, 2012 Remember make sure your engine is fully broken in before you do a compression test. Put 3-5 hours on it. Then do a compression test. That was rings will be seated. Makes a big difference. Quote Link to comment Share on other sites More sharing options...
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.