ASO-BANSHEE Posted July 13, 2011 Report Share Posted July 13, 2011 My banshee has no compression, i can move the kickstart all the way down with my hand with no force my bike starts though , but i need a new top end im new to banshees so what would be the best stock top end to buy or even an aftermarket top end if the price isnt too crazy im going to buy an compression tester right now , there suppose to be 175 in both cylinders correct ? thanks Quote Link to comment Share on other sites More sharing options...
ASO-BANSHEE Posted July 13, 2011 Author Report Share Posted July 13, 2011 bought the compression tester and the left cylinder has 60 PSI and the right has 90 PSI does this mean that the top end is bad or the crank seal ? i'm lost on this and any help would be much appreciated thanks Quote Link to comment Share on other sites More sharing options...
Larry's Shee Posted July 13, 2011 Report Share Posted July 13, 2011 bought the compression tester and the left cylinder has 60 PSI and the right has 90 PSI does this mean that the top end is bad or the crank seal ? i'm lost on this and any help would be much appreciated thanks http://bansheehq.com/forums/index.php?showtopic=140912 Quote Link to comment Share on other sites More sharing options...
ASO-BANSHEE Posted July 13, 2011 Author Report Share Posted July 13, 2011 http://bansheehq.com/forums/index.php?showtopic=140912 so i should redo the bottom end ? i thought the top end is what matters ?? Quote Link to comment Share on other sites More sharing options...
figuare9 Posted July 13, 2011 Report Share Posted July 13, 2011 http://bansheehq.com/forums/index.php?showtopic=140912 That's stupidly low on compression.. My god... It still runs!!!? lol Have u been fouling plugs? To answer your question.. YES! it's time for a new topend. You need to put a new top end in every 40ish hours. Or by the general rule of thumb "Every set of tires". And by that I don't meant a new bore/hone, pistons, just throw some rings in it if the cylinders/pistions look good. What I would do, is send the cylinders to a sponsor. FAST/HJR, etc. Ask them to bore/hone and send you back the necessary pistions/rings. OR... Send the cylinders out to a sponsor. Tell them you want a port job. . . They'll really make ur banshee scream and get you an entire new topend for only about 300 bucks. Quote Link to comment Share on other sites More sharing options...
ASO-BANSHEE Posted July 13, 2011 Author Report Share Posted July 13, 2011 That's stupidly low on compression.. My god... It still runs!!!? lol Have u been fouling plugs? To answer your question.. YES! it's time for a new topend. You need to put a new top end in every 40ish hours. Or by the general rule of thumb "Every set of tires". And by that I don't meant a new bore/hone, pistons, just throw some rings in it if the cylinders/pistions look good. What I would do, is send the cylinders to a sponsor. FAST/HJR, etc. Ask them to bore/hone and send you back the necessary pistions/rings. OR... Send the cylinders out to a sponsor. Tell them you want a port job. . . They'll really make ur banshee scream and get you an entire new topend for only about 300 bucks. fouling plugs ?? lol im new and i didnt do anything i just got the bike about 4 days ago im just trying to fix it up and make it look nice but i might as well buy new pistons /w rings but if i buy new pistons does that require new heads or i can use my old ones ???? thanks for the response btw Quote Link to comment Share on other sites More sharing options...
Zwiser Posted July 13, 2011 Report Share Posted July 13, 2011 Ok, since you obviously dont know what youre doing ill tell you what you going to need to do it yourself. 1. get a cylmers manuel 2. get a torque wrench 3. get a vernier caliper and measure the bore size and buy a piston acorddingly, if it needs bored make sure you check the piston to wall clearance. 4. buy wiesco pistons 5. check your rod bearings ( no up and down play, some side to side) 6. make sure the crank spins easaly 7. use good quaility gaskets ( oem, cometic) 8. if you dont feel capable of doing this send it off to a builder. Quote Link to comment Share on other sites More sharing options...
Zwiser Posted July 13, 2011 Report Share Posted July 13, 2011 also stock compression should be around 120 psi, and less than a 5% difference in compression between the two cylinders Quote Link to comment Share on other sites More sharing options...
ASO-BANSHEE Posted July 13, 2011 Author Report Share Posted July 13, 2011 Ok, since you obviously dont know what youre doing ill tell you what you going to need to do it yourself. 1. get a cylmers manuel 2. get a torque wrench 3. get a vernier caliper and measure the bore size and buy a piston acorddingly, if it needs bored make sure you check the piston to wall clearance. 4. buy wiesco pistons 5. check your rod bearings ( no up and down play, some side to side) 6. make sure the crank spins easaly 7. use good quaility gaskets ( oem, cometic) 8. if you dont feel capable of doing this send it off to a builder. never done a top end before but i know i can do it im pretty good with my hands and tools but im still going to give it to a mechanic im buying the wiesco pistons which ones should i buy are these good ? http://cgi.ebay.com/ebaymotors/WISECO-BANSHEE-TOP-END-PISTONS-PISTON-513MO6425-/140480756760?pt=Motors_ATV_Parts_Accessories&hash=item20b54e3c18 or http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=230303206414&ssPageName=STRK:MEWAX:IT these are over size would it fit in my regular cylinder head ? Quote Link to comment Share on other sites More sharing options...
jlsparky7 Posted July 13, 2011 Report Share Posted July 13, 2011 Quote Link to comment Share on other sites More sharing options...
figuare9 Posted July 13, 2011 Report Share Posted July 13, 2011 IMO... Spend an extra 150 bucks.. Pull the cylinders off, ship them to a sponsor and have them port your cylinders. (it'll make ur banshee go faster) and have the sponsor bore and hone them. You need to get the cylinders bored and honed anyways for the new topend. For what you'll pay a shop to do it, it's almost worth it to send it to a site sponsor. http://www.herrjugsracing.com/Yamaha_Banshee.html http://www.farmandsandtoys.com/services.asp That's just two.. MANY other sponsors in bansheehq can do it as well. Trust me.. It'll be worth EVERY penny to get it ported for your own riding style. Just rebuilt my new motor.. Leaning over the damn front bumper in 5th gear and the damn front end still hates touching the ground. Quote Link to comment Share on other sites More sharing options...
ASO-BANSHEE Posted July 13, 2011 Author Report Share Posted July 13, 2011 what pistons should i buy http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=230303206414&ssPageName=STRK:MEWAX:IT OR http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=390123898481&ssPageName=STRK:MEWAX:IT Quote Link to comment Share on other sites More sharing options...
Zwiser Posted July 13, 2011 Report Share Posted July 13, 2011 you have to find out what bore your on first. Quote Link to comment Share on other sites More sharing options...
ASO-BANSHEE Posted July 13, 2011 Author Report Share Posted July 13, 2011 you have to find out what bore your on first. if i was to check where should i ? on the piston correct bike looks like an stock top end though Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted July 13, 2011 Report Share Posted July 13, 2011 if i was to check where should i ? on the piston correct bike looks like an stock top end though what your not understanding is that you need to have your cylinders taken off the bike and taken to a shop and have them bored out. this is where they grind down the cylinder walls with special machinery......to give you a smooth perfectly round cylinder again. But before they do that they have have to measure hwo big they are going to make the cylinder and how much to remove. What a good machinist will do is order your pistons in and then bore your cylinders to the correct size that your pistons that he recieved. it gets sketchy to bore and THEN buy the pistons. Quote Link to comment Share on other sites More sharing options...
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