sp1tekiller Posted October 25, 2010 Report Share Posted October 25, 2010 My Buddy's Banshee will NOT get up into the meat of the power at all. We chased all the fuel issues we could and eventually found the compression was only 90 and 95. We're in the process of doing the top end, but still wondering if there is another issue causing the bogging/lack of getting into the power. I mean, other than the high rpm lack of power, this thing ran great. Didn't expect the compression to be so low. Quote Link to comment Share on other sites More sharing options...
spurdy Posted October 25, 2010 Report Share Posted October 25, 2010 My Buddy's Banshee will NOT get up into the meat of the power at all. We chased all the fuel issues we could and eventually found the compression was only 90 and 95. We're in the process of doing the top end, but still wondering if there is another issue causing the bogging/lack of getting into the power. I mean, other than the high rpm lack of power, this thing ran great. Didn't expect the compression to be so low. Don't forget to verify the jetting. Too fat will cause it to run flat or fall off on top. SP Quote Link to comment Share on other sites More sharing options...
sp1tekiller Posted October 25, 2010 Author Report Share Posted October 25, 2010 The jetting was/is good. However, it has slightly chipped reeds, a cracked intake boot and a messed up airfilter cage. Everything is going to be replaced, it seems that it sucked some sand into the cylinders. We're hopeful the rebuild and replacement of the parts I mentioned will get it back on track. Quote Link to comment Share on other sites More sharing options...
EvilBanshee Posted October 25, 2010 Report Share Posted October 25, 2010 The jetting was/is good. However, it has slightly chipped reeds, a cracked intake boot and a messed up airfilter cage. Everything is going to be replaced, it seems that it sucked some sand into the cylinders. We're hopeful the rebuild and replacement of the parts I mentioned will get it back on track. I dont think 95psi will cause your banshee to not rev out . Get your reeds and new boots and see what that does first. If it fixes your problem. then rebuild your motor if you want. 95 is pretty low. buty it should still run "decent" i would think. Quote Link to comment Share on other sites More sharing options...
sp1tekiller Posted October 25, 2010 Author Report Share Posted October 25, 2010 We're going to do the engine anyways, the pistons/cylinders have some noticeable scoring on them from the sand. Hopefully it's one of these things, because the jetting and everything all seemed to check out. Electrical problem maybe? Quote Link to comment Share on other sites More sharing options...
dirtbike drew Posted October 25, 2010 Report Share Posted October 25, 2010 90 - 95 is low I had a cr80 and it was only around 90. And it would run but once u wanted to get on the gas it was a turd with no power band. I rebuilt it and it screamed and it has a good powerband. I can't forget what the compression was after the rebuild on the cr 80. I was told the banshee should have around 120 compression. Quote Link to comment Share on other sites More sharing options...
midlifecrisis Posted October 25, 2010 Report Share Posted October 25, 2010 120- 150 psi, is normal for the shee, anything lower although not necessarily requiring a rebuild is suspect. More than 155 psi, look into running non pump gas. Quote Link to comment Share on other sites More sharing options...
tripledsracing Posted October 25, 2010 Report Share Posted October 25, 2010 90 - 95 is low I had a cr80 and it was only around 90. And it would run but once u wanted to get on the gas it was a turd with no power band. I rebuilt it and it screamed and it has a good powerband. I can't forget what the compression was after the rebuild on the cr 80. I was told the banshee should have around 120 compression. you are correct 120 comp but it still should run decent have you checked for a air leak?..also the reed will cause it to bog and be hesitant so for sure change those and make sure u do a air leak! Quote Link to comment Share on other sites More sharing options...
dirtbike drew Posted October 25, 2010 Report Share Posted October 25, 2010 you are correct 120 comp but it still should run decent have you checked for a air leak?..also the reed will cause it to bog and be hesitant so for sure change those and make sure u do a air leak! No air leak in the cr80 it was just low compression. I already rebuild it and it runs like new the compression was around 90. And after the new piston and rings it rips good I sold it to a friend for a play bike. And he likes it. But thanks. Quote Link to comment Share on other sites More sharing options...
tripledsracing Posted October 26, 2010 Report Share Posted October 26, 2010 (edited) No air leak in the cr80 it was just low compression. I already rebuild it and it runs like new the compression was around 90. And after the new piston and rings it rips good I sold it to a friend for a play bike. And he likes it. But thanks. oops sorry i was responding to killer but was agreein about the compression with you...which my lil 4mil had 130 comp and suppose to be 185-190 and the bike screamed but was bout to explode too..lol..so lower compression shouldnt hurt it unless you are talkin really,really low comp but 90 from 120 dont sound that bad to me,but if the bike has a air leak that would cause it to run like shit..jmo..trust me ive had a few bikes that done this and we chased it for months and was suckin air at the key way on the crank on my triple!//.. Edited October 26, 2010 by tripledsracing Quote Link to comment Share on other sites More sharing options...
stroking Posted October 26, 2010 Report Share Posted October 26, 2010 i had one here that only had 90psi and it ran really good! i also only run 125psi on a drag ported stock cylinder and it runs 6.5 in 1/8mile i doubt compression was your problem Quote Link to comment Share on other sites More sharing options...
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