fleury_xlt Posted June 17, 2010 Report Share Posted June 17, 2010 HI guys ! I'm new here and I have a question for you ! - I've just done a compression test on my both cylinders, and the result was around 90 P.S.I. on Std. bore (64mm) do I need to rebuild to end with new pistons and rings ? Thanks ! Quote Link to comment Share on other sites More sharing options...
fastbanshee8 Posted June 17, 2010 Report Share Posted June 17, 2010 Yes, you need to bore, and hone it, plus get new pistons, rings, gaskets, and wrist pin bearings. The bearings usually have to be ordered separate, as they do not come with most piston kits. Quote Link to comment Share on other sites More sharing options...
blowit Posted June 17, 2010 Report Share Posted June 17, 2010 HI guys ! I'm new here and I have a question for you ! - I've just done a compression test on my both cylinders, and the result was around 90 P.S.I. on Std. bore (64mm) do I need to rebuild to end with new pistons and rings ? Thanks ! Again, what tester did you use? Quote Link to comment Share on other sites More sharing options...
J-Madd Posted June 17, 2010 Report Share Posted June 17, 2010 Did you hold the throttle wide open and kick until the gauge stopped? Quote Link to comment Share on other sites More sharing options...
Pasi S. Posted June 17, 2010 Report Share Posted June 17, 2010 (edited) I have to tell you this - double check with another tester before you do anything expencive. This is what happened to me 1 year ago. I ordered my first mods for my banshee and after that I was thinking what was my compression. I bought a tester and it showed 55 and 65, I was like WTF?! I went with my tester to a local shop that maintain 2 stroke bikes. They compared it to one of them testers and said that my tester was NO GOOD and I should return it back - so I did. I bought another one and it showed 110 and 115. I was thinking that thats the way it should be but it´s low. I called to a good friend of mine and he told me that it might be a good time to bore it and also to make a port job and shave my stock head at the same time. After a long research and studing of porting and waiting my parts I was finaly done - 8 months later!!! My motor was back together and everything was good so I finaly go to break it in. After a good break in I was thrilled! Sounds great and stuf like that. Next thing was to check how high was my new compression... 125 and almost 125!!!! HELL YEAH! THE SECOND TESTER WAS LEAKING! - Now my motor runs great but I did all that shit because of my bad tester. DOUBLE CHECK - before you put your Visa on-line! -Pasi S. (sorry my bad english) ...OH! and I went from the bone stock to mods in my sig. LOL! Edited June 17, 2010 by Pasi S. Quote Link to comment Share on other sites More sharing options...
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