dirtbike77

nope i didnt notice that.. but that could cause the alot of problems....

i pulled the top end off today to check and make sure the pistons were still in good shape and boy what did i find !!!!! the pistons qwhen up at tdc is still like a inch and a half from the top? on both sides . so im running the numbers off the top of the pistons.. 5271c 795m06500 part #pk150 that suppose to be used with a a 5mm stroker crank? could this be causing severe driveability problems listed in the previous posts?

ive been reading all these post about diffrent backfiring and sputtering problems and i thought maybe the brake sensor up by the clutch lever could be a culprit '' but its disconnected''....... the wires dont have to be cut and spliced together do they? im pretty sure all the tors are disconnected... i think the next move is gonna be the jets. from what i understand the 200 main jets are to to small? i have the air screws almost all the way in to keep it from running mre f'ed up?

i took the flywheel of today to check for a sheared key and it was fine i did hear a lil noise when shaking the flywheel though? so i tried siwtch with another one and nothing still the same? still backfiring at idle and at wot?

were going to go and pick up some 270 or 290 main jets to see if that solves the lean condition.... i dont know the extent of the port job and what affect it would have on the jetting. but hopefully thats what the problem is ! :shrug:

ok im gonna give that a shot... but could that be causing the back fire ?

by the way the jet needles are in the third position... it has 200 jets in it im assuming thats the stock size? the bike has t-5's? port and polish job

all the tors items are removed

i checked the carb slides and im pretty sure there in right . with the halfmoon facing the airbox? wats getting me is the backfiring when u hit the throttle a little bit pass idle... we tryed switching plugs , ignition coils? and swapping from plug cap to the other and still the same thing?

i havent did a copression test as of yet but the timing is stock.. im thinking it has to be something eletrical for it to back fire like that. the little magnetic pieces on the flywheel seem to be pretty clean? i adjusted the pick up coil with a buissness card. and nothing?

i can home today to try some new things... i cleaned the carbs again? cleaned the fuel petcock assembly? put fresh gas in it? and still the same thing? sputters at wot? and even while holding it at a little before half throttle the bike backfires? u can see the flame coming out of the back of the carbs? i adjusted the pick up coil gap? and still nothing? wats else can sause this

im going to replace the spark plugs today and see wat happens? i jus cant figure out wat else it can be?

i also checked for air leaks with carb cleaneer around the base gaskets and the intake manifolds? and none found

hey guys jus rebuilt a banshee for a buddy and now we cant get it to run right. the tors has been removed already. fresh top end rebuild. carbs have been taken apart several times and cleaned. the choke tube is in place. the carbs have been synced as best as possible. air screws are about half a turn to one turn out before it dies out? the bike idles fine .... but no power. its very sluggish to the powerband? almost as if its running off one cylinder? both pipes are smoking normally and both pipes are hot? by the way the bike has new spark plugs? could it be possibility the plugs could've fouled by running it with the tors connected? he has the thumb switch connected and the little black box. i dissconnected both but it cleared out a little bit but still has no power? what's next