Banshee SE Posted January 8, 2010 Report Share Posted January 8, 2010 Ok, the results of my compression test was 90psi and 110psi. What you guys think?? the motor is dead or not? Really the Banshee has not been use in along time and the motor was completely cold, don't know if this fact have relation with the result. What is the most healthy compression for a stock motor?? Any advice please?? Thanks again guys, I'm new here!!! sorry for bother with this question. other thing, what is the process to realize the compression test?? maybe I'm doing something wrong?? Quote Link to comment Share on other sites More sharing options...
MatHolland Posted January 8, 2010 Report Share Posted January 8, 2010 you need to rebuild the top end...stock compression should be around 120psi with no bigger than 5psi difference... hold throttle wide open and kick until the guage stops moving. Quote Link to comment Share on other sites More sharing options...
LiftdT4R Posted January 8, 2010 Report Share Posted January 8, 2010 Whoa, I would say yes. 90 psi is very low, I typically rebuild at 100psi. And a new motor will usually test to 125psi with stock heads at sea level. Also though, do you know if the compression tester is right? Some of these new cheap testers don;t work so well, and a few people have had issues with them. If those are in fact the right values I would pull the cylinders and take them to a machinist, or measure them out yourself with a bore gauge and see if your going to need a rebore or just a hone and rings. Could save you a couple bucks if the bores arent too bad. Quote Link to comment Share on other sites More sharing options...
Banshee SE Posted January 8, 2010 Author Report Share Posted January 8, 2010 Whoa, I would say yes. 90 psi is very low, I typically rebuild at 100psi. And a new motor will usually test to 125psi with stock heads at sea level. Also though, do you know if the compression tester is right? Some of these new cheap testers don;t work so well, and a few people have had issues with them. If those are in fact the right values I would pull the cylinders and take them to a machinist, or measure them out yourself with a bore gauge and see if your going to need a rebore or just a hone and rings. Could save you a couple bucks if the bores arent too bad. Shoot!!! and regularly how much money you will spend doing this job?? / Quote Link to comment Share on other sites More sharing options...
kodie Posted January 8, 2010 Report Share Posted January 8, 2010 if you know how to put pistons in yourself and take the head off and put it back on along with the gaskets your looking around 300 bucks for 2 new pistons and a bore/hone job give or take 20 bucks. Its not hard at all to do your own top end rebuild just gotta find someone to bore your cylinders to what you need them. The site sponsors offer bore jobs and are highly recommended. Quote Link to comment Share on other sites More sharing options...
broncbob Posted January 8, 2010 Report Share Posted January 8, 2010 The compression test should be done warm. Get the engine to operating temp and re-test. Open the throttle all the way and kick till the gage quits going up. Make sure the plug hole area is clean to provide a good seal with the tester. You should see higher numbers, and maybe even see the cylinders even out. Quote Link to comment Share on other sites More sharing options...
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