acroadam Posted August 27, 2009 Report Posted August 27, 2009 I just got my 97 banshee with T5 pipes, cool heads, 18cc domes, and K&N filter.. Well, i just didnt really feel the power. So i had my friend ride it, and the first thing he noticed was that the kickstart had very little pressure, meaning that i need a top end rebuild cuz im loosing compression. So i was wondering if, when i take off my heads, to get to my pistons, and if its not scuffed up, should i keep it a stock bore, or should i just bore out? Im tight on money. So im more likely to keep it a stock bore till next rebuild(depending on my jugs.)....but IS the banshee still gonna be powerful with a stock bore, with my other mods? Thanks a lot.. Quote
patrickkomar Posted August 27, 2009 Report Posted August 27, 2009 (edited) What you need to do is run a compression test before you take the head off! The stock bore banshee is no slouch(buy the way stock bore means that you are using oem sized jugs from factory fresh to about .080 over. boring the stock cylinder will not really net you much more hp nor displacement) but it's not going to set the asphalt a blaze ether.If you compression numbers are good you need to look to jetting to fix your problems. My stock bore banch takes me just about any were I want to go in the little Sahara sand dunes here in ut. and will get me up thunder mountain in id. and if I had a 6" over arm I'm betting it would take me up choke cherry all so! If your numbers on the compression test are low and you pop the head and find scuffed jugs then your looking at most likely a boar job and a new set of pistons and if the money allows it I would have port work done wile your at it as this will start you down the road to setting some thing on fire! Edited August 27, 2009 by patrickkomar Quote
acroadam Posted August 27, 2009 Author Report Posted August 27, 2009 What you need to do is run a compression test before you take the head off! The stock bore banshee is no slouch(buy the way stock bore means that you are using oem sized jugs from factory fresh to about .080 over. boring the stock cylinder will not really net you much more hp nor displacement) but it's not going to set the asphalt a blaze ether.If you compression numbers are good you need to look to jetting to fix your problems. My stock bore banch takes me just about any were I want to go in the little Sahara sand dunes here in ut. and will get me up thunder mountain in id. and if I had a 6" over arm I'm betting it would take me up choke cherry all so! If your numbers on the compression test are low and you pop the head and find scuffed jugs then your looking at most likely a boar job and a new set of pistons and if the money allows it I would have port work done wile your at it as this will start you down the road to setting some thing on fire! thanks for the info.. so the kickstart wont show it being low on compression? Quote
patrickkomar Posted August 27, 2009 Report Posted August 27, 2009 Yes and no...... if there is no resistance at all when you kick then ya some thing is way wrong. You should be able to slowly move the kicker and feel one of the cylinders come to the compression stroke but it's not like trying to kick over a big bore thumper! The compression test will tell you all you need to know about the general state of affairs inside of engine. Quote
Wheelie Ripper Posted August 28, 2009 Report Posted August 28, 2009 You really need to just do a compression test, my buddys bike had 70 psi and started right up and idled and the kicker felt find. there is NO substitute for an actual test. you should also do a leak down test as well. you may not have a choice of what bore to use. After honing, you should have about .003" piston to cylinder clearance (you measure the bore with a bore gauge and subtract .003" and see if the stock size piston will work). If your within specs you can just hone and put stock size pistons in, if not you need to have it bored out. also if the cylinder is scored you will need to have it bored. Most bore jobs aren't from choice as they dont yield that much power Quote
acroadam Posted August 30, 2009 Author Report Posted August 30, 2009 i went to o'reilys and rented a compression tester, and when i screwed it into my head, it wouldnt read at all. Let me know if im doing something wrong, here is what i did... Take of gas tank takeout spark plugs rent the compressing tester Screwed it in, pushed the trottle wide open, and kept of kicking starting it...... And thats it! Let me know if im doing something wrong.. Thanks. Quote
qcklys Posted August 30, 2009 Report Posted August 30, 2009 i went to o'reilys and rented a compression tester, and when i screwed it into my head, it wouldnt read at all. Let me know if im doing something wrong, here is what i did... Take of gas tank takeout spark plugs rent the compressing tester Screwed it in, pushed the trottle wide open, and kept of kicking starting it...... And thats it! Let me know if im doing something wrong.. Thanks. maybe there is a leak with the compression gauge? Quote
acroadam Posted September 1, 2009 Author Report Posted September 1, 2009 well i took my head off, and jugs.. and my right piston is trashed!.... as soon as i pulled the jug off, the piston ring came off in pieces.. i just hope nothing got down in the crank area... I was wondering if there needs to be a rubber seal where my pipes go into the jugs.. cuz when i pulled my pipes off, there wasent.... there was oil/gas seaping from my right jug, down under the pipe... Quote
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