devon Posted February 10, 2012 Report Share Posted February 10, 2012 i just bought a 87 stock bike and it keeps droping the left cylinder ive cleaned carbs new reeds and plugs ive got 106 psi on both cylinders it will idle on both but once u start riding it goes in and out u can here tryin then it will go but drops out after a min Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted February 10, 2012 Report Share Posted February 10, 2012 What's your elevation? By me 106 is low. And also when I blew out my reeds the bike would idle and it would cut out when I gave it gas. It would kick back in if I backed off the throttle or at a easy coast. I looked and my reed was shattered to pieces when i had a huge back fire. Quote Link to comment Share on other sites More sharing options...
devon Posted February 10, 2012 Author Report Share Posted February 10, 2012 What's your elevation? By me 106 is low. And also when I blew out my reeds the bike would idle and it would cut out when I gave it gas. It would kick back in if I backed off the throttle or at a easy coast. I looked and my reed was shattered to pieces when i had a huge back fire. im not sure of my elevation but im in mich and my reeds r brand new i just put them in yesterday Quote Link to comment Share on other sites More sharing options...
NickisGod Posted February 10, 2012 Report Share Posted February 10, 2012 check your choke tube, its a small black hose that connects the carbs together. if that dosnt work, try pulling the cable on the side thats bum and see if it revs up. dont go yanking on shit though, you gotta speak to your banshee lol. see if u can narrow it down to one of the three things, spark,fuel,compression. the compression is kinda low, but that shouldnt matter if there equal and the bike starts. did u get rid of the tors system? ive had this problem many of times ill list a few things ive gotten tripped up on. throttle cable not adjusted properly or the cable was being pulled on one side pick up coil screws backed out and it was dangling air leak, from the reed/carb boot/air filter. some how a piece of paper towel got sucked into my float bowl and clogged my jet, thats still a mystery to me. bad ground also try swapping the spark plug wires, see if anything changes theres a shit ton of possibilities and 90% of the time its human error. dont give up, just keep diagnosing Quote Link to comment Share on other sites More sharing options...
devon Posted February 10, 2012 Author Report Share Posted February 10, 2012 check your choke tube, its a small black hose that connects the carbs together. if that dosnt work, try pulling the cable on the side thats bum and see if it revs up. dont go yanking on shit though, you gotta speak to your banshee lol. see if u can narrow it down to one of the three things, spark,fuel,compression. the compression is kinda low, but that shouldnt matter if there equal and the bike starts. did u get rid of the tors system? ive had this problem many of times ill list a few things ive gotten tripped up on. throttle cable not adjusted properly or the cable was being pulled on one side pick up coil screws backed out and it was dangling air leak, from the reed/carb boot/air filter. some how a piece of paper towel got sucked into my float bowl and clogged my jet, thats still a mystery to me. bad ground also try swapping the spark plug wires, see if anything changes theres a shit ton of possibilities and 90% of the time its human error. dont give up, just keep diagnosing no i did not get rid of the tors system im new to banshees not sure what to do to it yet but i know i want to get it runnung right before i start moding it. i did switch plug wires and plugs no diff. what cable r u talking a bout the choke tube is fine to carbs r clean almost to clean kinda wierd Quote Link to comment Share on other sites More sharing options...
Larry's Shee Posted February 10, 2012 Report Share Posted February 10, 2012 (edited) TORS "brain" box is on left frame tube by gas tank, un plug it, you can clean up wireing later. Should be two grounds in wireing, one by engine somewhere other by volt reg back under seat. Also make sure coil has clean, bare metal contact. Make sure pick-up tits on flywheel are clean, gap pick-up coil to .018-.020. On my son's I also cleaned the poles on the stator of all rust to eliminate a one sided miss. Use ONLY a Banshee flywheel puller, no 2-3 jaws=fucked flywheel. Either buy a Clymers or find the download manual somewhere around here. While you're working on it ohm plug caps and also trim 1/4" off plug wires for fresh contact, add a dab of dielectric grease also. BTW, where you at? I'm between Pontiac and Flint. Edited February 10, 2012 by Larry's Shee Quote Link to comment Share on other sites More sharing options...
NickisGod Posted February 10, 2012 Report Share Posted February 10, 2012 (edited) no i did not get rid of the tors system im new to banshees not sure what to do to it yet but i know i want to get it running right before i start moding it. i did switch plug wires and plugs no diff. what cable r u talking a bout the choke tube is fine to carbs r clean almost to clean kinda wierd ok sorry i didnt realize you were new, i kinda have a problem with assuming. im talking about your throttle cable. its been awhile since ive seen a stock banshee but on my throttle cable i have a 1 into 2 split, the split is somewhere close to where the carbs are. on mine, the cable for right and left carb can be pull out slightly from the splitter. ive had it once where one cable was hitting a radiator hose or something and being pulled out of the splitters socket a lil. tors it the yamaha fail saftey mechanism. there huge boxes ontop of ur carb caps that plug in your wire harness, if u have them u still have tors or throttle over ride system. this may or may not be the problem, i doubt it is though. look into eliminating them in the future to make trouble shooting easier. this is wat tors system looks like http://www.ebay.com/itm/Yamaha-Banshee-TORS-kit-carburators-/290669252300?pt=LH_DefaultDomain_0&hash=item43ad3ccecc heres the delete kit http://www.ebay.com/itm/Motion-Pro-Throttle-Kit-TORS-Eliminator-Yamaha-YFZ350-Banshee-1987-2006-/320841206209?pt=Motorcycles_Parts_Accessories&vxp=mtr&hash=item4ab3a049c1 from the sounds of it, it isnt electrical. this is kinda good news. check ur spark plugs, are they matching, br8es vs br8s? im gunna list some stupid things here but pick and choose what youve done already, maybe i might list one u havent tryed. jet size are matching? fuel to both carbs? float bowl installed backwards? carbs on right side? did u forget a piliot jet? are the carbs sync? are u sure about the choke tube? some one chime in on this one, i remember reading something about a parking brake limiter. basically it wont allow u to rev at standstill. needles jets in both carbs at equal clip position? if u happen to have a tors delete kit, check the idle manual adjuster on the cap where the cable feeds in. to be sure, keep the bike off, pull the air filtration system off, and push the throttle in slowly and observe the motion. u want the slides to being identical when u give it gas one time i put the stupid slide in backwards, witch ended up not being my fault, the guide pin was shot. try swaping the slides. have ur bike running, rev it and put ur hand or some paper behing the exhaust to collect some exhaust samples. is the bum side is oily that means no combustion/ignition, if its wet and sweet smelling u have a bad head gasket with anti freeze in ur cylinder, if ones hotter than the other and they have the same samples, its a fuel delivery issue, if theres no varriation between the two ???? if all else fails, u may want to switch sides w/ ur reeds, or swapping parts untill something gives. for some reason i think its something to do with u carb slides. this is more information most ppl would bother posting and if this dosnt help u may wanna start grave digging other 1 cylinder firing post Edited February 10, 2012 by NickisGod Quote Link to comment Share on other sites More sharing options...
Broke_Banshee Posted February 10, 2012 Report Share Posted February 10, 2012 personally i would do a leakdown,i see them all the time with the left crank seal done Quote Link to comment Share on other sites More sharing options...
NickisGod Posted February 10, 2012 Report Share Posted February 10, 2012 personally i would do a leakdown,i see them all the time with the left crank seal done not a bad idea Quote Link to comment Share on other sites More sharing options...
devon Posted February 15, 2012 Author Report Share Posted February 15, 2012 not a bad idea think i figured it out some one had the overflows linked together on the carbs so it was just poreing fuel in the left side thanx guys now i can start moding it ang suggestions were i should start Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted February 15, 2012 Report Share Posted February 15, 2012 think i figured it out some one had the overflows linked together on the carbs so it was just poreing fuel in the left side thanx guys now i can start moding it ang suggestions were i should start WARNING.....there is ONE tube that is supposed to connect the carbs together. It is a black tube that runs exactly in line with the choke knob to the other carb. It is THE CHOKE TUBE. These carbs use a single knob that is connected via vacuum tube as oppose to a shaft style. Quote Link to comment Share on other sites More sharing options...
NickisGod Posted February 15, 2012 Report Share Posted February 15, 2012 Hum i only said that twice Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted February 15, 2012 Report Share Posted February 15, 2012 Haha....I know you did nick....just making sure for his sake he gets it in his head. He said he was new and I didn't want him thinking the choke tube was the actual plunger on the choke assembly. Quote Link to comment Share on other sites More sharing options...
devon Posted February 16, 2012 Author Report Share Posted February 16, 2012 Haha....I know you did nick....just making sure for his sake he gets it in his head. He said he was new and I didn't want him thinking the choke tube was the actual plunger on the choke assembly. i know and it wasnt the choke tube it was the one on the bottom Quote Link to comment Share on other sites More sharing options...
devon Posted February 16, 2012 Author Report Share Posted February 16, 2012 i think i got a good deal on some carbs what u think the are stock but the come with twist throttle and cable and torse eliminater kit for 75.00$ Quote Link to comment Share on other sites More sharing options...
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