G3mend Posted November 5, 2013 Report Share Posted November 5, 2013 Hello all i just rebuilt my top end and went to 65mm pistons. Im using stock carbs with 320 mains. I have an open air box with KN air filter and a porting job. When i bought the bike it screamed when it hit the power band. Problem was it was jetted with 280 mains and i was running to lean and blew gasket and kept overheating. At this point i decided to rebuild top end and go the next size up to 65mm. Put everyhting back together and everything seemed good. 125 psi on each cylinder. Broke it in using 15 minute heat cycles for a whole ank of gas never going above three quarter throttle. After the break in, when i went to hit it (accelerate hard) and feel that notorious banshee acceleration it just want their. Never really seemed to hit the power band. While i rode i kept checking the temp of the head on each cylinder using a infrared thermometer. The left cylinder seemed to top out at about 210" (fairly normal for hard riding i believe) and the right cylinder seemed to top out at about 175-180 degrees. It almost seems that the right cylinder isn't getting used to its full potential. I swapped the ignition coils to see if the problem moved to the other cylinder but it did not. Any help will be appreciated. PS i tried 320 and 330 mains and the same thing Quote Link to comment Share on other sites More sharing options...
Surfrjag Posted November 5, 2013 Report Share Posted November 5, 2013 Are the slides in the right direction? Maybe you need to go leaner did you check plugs? Quote Link to comment Share on other sites More sharing options...
J-Madd Posted November 5, 2013 Report Share Posted November 5, 2013 Whats the compression? Did you do a leak down test? Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted November 6, 2013 Report Share Posted November 6, 2013 im hoping that....when you say you put 65mm pistons in.....you had the cylinders bored to the correct size right? Did you have it bored for the piston and THEN went and bought pistons after? This is all pertinent information to solving the issues you have.... Quote Link to comment Share on other sites More sharing options...
ph2smoke Posted November 7, 2013 Report Share Posted November 7, 2013 Go through the carbs. Make sure they are in sync. Like surfjag said check the slides maby 1 or both are in backwards. Also 125psi for a ported banshee is very low. 125psi is stock. I would shoot for 150psi if your trying to run pump gas. Quote Link to comment Share on other sites More sharing options...
Larry's Shee Posted November 10, 2013 Report Share Posted November 10, 2013 mouse nest in pipe/silencer Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted November 10, 2013 Report Share Posted November 10, 2013 Go through the carbs. Make sure they are in sync. Like surfjag said check the slides maby 1 or both are in backwards. Also 125psi for a ported banshee is very low. 125psi is stock. I would shoot for 150psi if your trying to run pump gas.Negative, if there is port work on the exhaust it will lower comp. so if someone has a stock motor and ports it the compression will be lower if dome/head work isn't done. Quote Link to comment Share on other sites More sharing options...
BLOODRAGE Posted November 11, 2013 Report Share Posted November 11, 2013 Try cleaning your stator Just saying. Quote Link to comment Share on other sites More sharing options...
Rustbag Posted November 14, 2013 Report Share Posted November 14, 2013 Did you do a leak down test? Quote Link to comment Share on other sites More sharing options...
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