duketj8 Posted April 12, 2004 Report Posted April 12, 2004 My banshee has 80 psi on one cylinder and 110 on the other. I am pretty sure this is not good. Does anyone know what the right compression is? Quote
ledofthezep Posted April 12, 2004 Report Posted April 12, 2004 Stock head? Sounds like you need to do a top-end job for sure though. Anything below 110 is not good, and any difference between the cylinders greater than 10lbs is not good either. You're at 30psi difference, bet shee isn't running too hot either huh!? I'm pretty sure stock is anywhere from 120-130lbs. Quote
duketj8 Posted April 12, 2004 Author Report Posted April 12, 2004 Yeah shee falls on her face at full throttle. Does that sound about right? Quote
scotts96fast Posted April 13, 2004 Report Posted April 13, 2004 (edited) You need a new top end... ....stock setup is 120-130 like led said...I think the factory aims for 125lbs... Edited April 13, 2004 by scotts96fast Quote
Rescuejeff Posted April 13, 2004 Report Posted April 13, 2004 Sorry my friend, you have a serious problem possible. You man just need to re ring it or do a complete rebuild. Look at the cylinders for damage and then look at the pistons. If they look good then look in to the rings action. If any damage is noticed then rebuilt it. Good luck. Quote
duketj8 Posted April 13, 2004 Author Report Posted April 13, 2004 I stripped it down and I had a broken piston and the one that wasnt broken looked worse it had a broken ring. I think the crank is ok is there something to look for to make sure the crank is good? Quote
QuadMX Posted April 13, 2004 Report Posted April 13, 2004 Funny story...Last year right at the end of summer I believe, I went riding over by a friends house. He's got a nice little flat track setup. Anywho...Most of the time we were there was tryin to get his bike started. RM125. We ended up pulling it behind a fourwheeler to get it goin and it started, ran fine, but couldn't be kicked over, only pull started. He took it to his bike shop (his parents own a harley shop). Turns out he only had 10lbs of compression. Sorry, not really a solver for your problem, just thought I'd share that it still ran and everything. Hope you get your stuff fixed. Quote
LegendSS28 Posted April 13, 2004 Report Posted April 13, 2004 If your notl ow on cash, I'd go for the full rebuild Quote
Schizo Posted April 14, 2004 Report Posted April 14, 2004 If you had a broken piston and a broken ring then where do you think them broken pieces went to?? I'd bet to say they went right down into the crank. You better split the cases and make sure you get all the debris out of there. There is a good chance that your crank is "outta wack" now too so you'd be smart if you have it trued then welded while your at it. Quote
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