banshee has limited power

[dirtbike77]

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

[dirtbike77]

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

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

[xTHUNDERCATx]

you could check the spark if the spark is weak when you get on the throttle it could be drowning it and putting it out rather then igniting the gas properly

just an idea

[dirtbike77]

you could check the spark if the spark is weak when you get on the throttle it could be drowning it and putting it out rather then igniting the gas properly

just an idea

im going to replace the spark plugs today and see wat happens?

 

i jus cant figure out wat else it can be?

[dirtbike77]

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

[x_doug_x]

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

 

i just got through with a similar problem i'll tell you what all i did hoping for a correction

bought a flyhweel puller cleaned the stator with a dremel and cleaned the inside of the flywheel, also cleaned the outside of flywheel and the sensor.

 

changed the reeds out, i had aftermarket boysen reeds, took them out and put a stock set of reeds i had laying around that closed "all the way" still nothing

 

removed the plug wires and went from one cylinder to the other, the same cylinder missed, didn't matter which way the plug wires were

 

i noticed every time i had the jets out i could see a "Round" hole through one, and not the other. so i ordered jets off ebay but i'm impatient and wanted to know for sure this was the problem, i went by hobby store today and picked up some really small drillbits and drilled the pilot jets one size bigger, now it idles on both cylinders. i'm just waiting on new jets to come in before i mess with it anymore

 

so that was the problem. but you see how i troubleshooted, i also checked to make sure both carbs were getting gas.

[sangheraent]

did you do a compression test?

is your timing stock or adjusted?

 

[dirtbike77]

did you do a compression test?

is your timing stock or adjusted?

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?

[AKheathen]

throw the new plugs in. if it gets better, re-jet. remember, adjustments are for a warm engine. other than that, check reeds and compression.

[doorslammer]

carb slide(s) in backwards?

[dirtbike77]

carb slide(s) in backwards?

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?

[AKheathen]

e-brake switch?

[dirtbike77]

all the tors items are removed

 

[Rodneya]

e-brake switch is not part of the tors.

[dirtbike77]

e-brake switch is not part of the tors

 

i have the wire that runs from the parking brake up by the clutch lever is disconnected? the black box on the left side of the frame is disconnected, the wires from the thumb throttle is disconnected, the tors above the carbs is disconnected?

 

i tried wiggling the harness around today to see if it changes and nothing. still the same issue....its mainly on the right side were the back firing is an issue? i swapped every thing from the left to the right but the carbs?

 

its backfiring at idle only on the right side. spray around for air leaks and nothing changes at all?

 

iu tried syncing the carbs as best as possible and nothing?

 

what to try next.. lol i never been stomped like this before with a banshee? all we did was rebuild the motor... had a port and polish job? a;; new gaskets and seals?