BANSH-alena-jol-EE Posted February 17, 2009 Report Share Posted February 17, 2009 hello i just got a 04 banshee, i did a compression test, it has 95 on both cylinders, engine has neverbeen redone, should i tamper with it or is it fine? Quote Link to comment Share on other sites More sharing options...
blaster2006 Posted February 17, 2009 Report Share Posted February 17, 2009 you should definately rebuild. if i hit about 105-110, i would rebuild myself... get it bored and honed and get some wiseco's Quote Link to comment Share on other sites More sharing options...
deckheight Posted February 17, 2009 Report Share Posted February 17, 2009 If the bike is running good and you have no other reason to suspect a problem and both cylinders are within 5 or so psi of each other I personally would probably call it good enough. Quote Link to comment Share on other sites More sharing options...
blowit Posted February 17, 2009 Report Share Posted February 17, 2009 If the bike is running good and you have no other reason to suspect a problem and both cylinders are within 5 or so psi of each other I personally would probably call it good enough. I would have to disagree. Being 35lbs off from OEM specs is cause for inspection. The first things I would want to know is what kind oc comp gauge was used. The cheapy ones are notorious for showing low numbers. If the comp is indeed low, it should be opened "before" it pops. That is, if you want to save the crank. Brandon Quote Link to comment Share on other sites More sharing options...
jjn56 Posted February 17, 2009 Report Share Posted February 17, 2009 I would make sure the compression test was done correctly first with the correct fitting and a good tester and at wide open throttle. Then if it is still at 95 PSI, open it up. Quote Link to comment Share on other sites More sharing options...
shanYE west Posted February 17, 2009 Report Share Posted February 17, 2009 Anyone bother to find out what elevation was?? Quote Link to comment Share on other sites More sharing options...
tony cub Posted February 17, 2009 Report Share Posted February 17, 2009 Anyone bother to find out what elevation was?? x2 :shoothead: Quote Link to comment Share on other sites More sharing options...
05.Banshee.SE Posted February 17, 2009 Report Share Posted February 17, 2009 x2 :shoothead: If all the infor checks out alright, and it is truly low compression...rebuild that beast... I agree completely with "blowit." Rebuild it before engine failure...or it's going to be way more expensive and a PITA down the road... $300 and 2 weeks @ Herr Jugz... Quote Link to comment Share on other sites More sharing options...
BANSH-alena-jol-EE Posted February 17, 2009 Author Report Share Posted February 17, 2009 i removed both spark plugs, its a star products tu-3 universal compression tester, i held the throttle wide open, she hit exactly 90 on both cylinders, im basically at sea level,maybe 50ft up ahha, the bike hauls ass still, i just yesterday i ran faster than a outlaw 525 piped and jetted and she was 09, just wondering if a fresh top end would make her faster? or "if it aint broke dont fix it".....also how much should i get her bored out, what pistons? is there anything else that i would have to change to compensate with the new hp? thanks !! Quote Link to comment Share on other sites More sharing options...
blowit Posted February 17, 2009 Report Share Posted February 17, 2009 (edited) i removed both spark plugs, its a star products tu-3 universal compression tester, i held the throttle wide open, she hit exactly 90 on both cylinders, im basically at sea level,maybe 50ft up ahha, the bike hauls ass still, i just yesterday i ran faster than a outlaw 525 piped and jetted and she was 09, just wondering if a fresh top end would make her faster? or "if it aint broke dont fix it".....also how much should i get her bored out, what pistons? is there anything else that i would have to change to compensate with the new hp? thanks !! I am seriously wondering about your tester. "universal" scares me. Can you post a pic of the tip of it that goes into the head? I am looking for long threads and a schrader valve in the tip. Without those, your test is worthless. Boring is simply to clean the bore up if damaged. Not going to get much from it. Without knowing your mods, no idea what else to tell you. "if it ain't broke, don't fix it".......If it ain't broke and it truly is down 35-40psi on comp, it soon will be. Either your tester or engine need help. Brandon Edited February 17, 2009 by blowit Quote Link to comment Share on other sites More sharing options...
BANSH-alena-jol-EE Posted February 17, 2009 Author Report Share Posted February 17, 2009 ill try to get a pic later on tonight of the tip, my bike is 04 she has fmf gold series sst pipes powercore 2 silencers, k and n filter, i got vf3 reeds comming with boost bottle and amr stage 3 rev box...shes been jetted, has 1/4 reed spacers, other than that shes all stock... Quote Link to comment Share on other sites More sharing options...
04sand4 Posted February 18, 2009 Report Share Posted February 18, 2009 whens a good time to do a compression test, eng cold or eng hot ? Quote Link to comment Share on other sites More sharing options...
MikeNick Posted February 18, 2009 Report Share Posted February 18, 2009 ill try to get a pic later on tonight of the tip, my bike is 04 she has fmf gold series sst pipes powercore 2 silencers, k and n filter, i got vf3 reeds comming with boost bottle and amr stage 3 rev box...shes been jetted, has 1/4 reed spacers, other than that shes all stock... BOOST BOTTLE!!! WTF Quote Link to comment Share on other sites More sharing options...
poorboystoys Posted February 18, 2009 Report Share Posted February 18, 2009 BOOST BOTTLE!!! WTF you put it on top of your carbs and its supposed to bring in more air to the engine Quote Link to comment Share on other sites More sharing options...
brugal Posted February 18, 2009 Report Share Posted February 18, 2009 BOOST BOTTLE!!! WTF you put it on top of your carbs and its supposed to bring in more air to the engine hahaha I needed that.. Quote Link to comment Share on other sites More sharing options...
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