missfireing after 1/4 throttle

[YA*AM*A*HEAD]

ok guys been looking for hours and havent found anyone with the same problems as myself...i have a stock 2000 banshee..with stock mukuni carbs with tors still on it.. it has a k an n air filter, boysen power reeds ,and pro circut and 304 sliencers other than that its stock and i ride at like 800 ft above sea level ....it has 300 mains and 27.5 poilets at 2 1/2 turns out .running caster oil at 9 ounces per 3 gallons of 93..plugs look a little dark cardboard color but not bad ,,,the problem is it runs great below 1/4 throttle above that it is missing on one cylinder til i let off the gas ...i replaced reeds, got rid of boost bottle, made sure there are no air leaks ....no sure were to look now ...i was wondering if the tors could be cutting out one cylinder ? can i bypass tors without changing carb tops just to see if that is what is causing my problem??

[J-Madd]

You can unplug the TORS without changing the carb tops. It sounds like its your parking brake rev limiter. Make sure the parking brake is not on, or unplug the sensor. That'll fix your problem.

[pabansheematt]

You can unplug the TORS without changing the carb tops. It sounds like its your parking brake rev limiter. Make sure the parking brake is not on, or unplug the sensor. That'll fix your problem.

if that don't fix it. I'd check the coil. I had a similar problem and it turned out to be the coil.

[YA*AM*A*HEAD]

if that don't fix it. I'd check the coil. I had a similar problem and it turned out to be the coil.

thanks guys ill try unplugging it ...i also put avs levers on iy so i belive the brake switc is just hanging under tank,,,so if i unplug tors at the carbs it will bypass the system ? and just unplug the brake light switch to bypass cut out switch ?

[YA*AM*A*HEAD]

ok i figured out it is not the brake rev limiter i did have it unpluged so i pluged it back in and it ran horriable ,,i unplugged tors and still ran the same ...the left pipe has oil all around the joint and by looking in the tail pipes it is alot oiler than the right ...i have had these carbs off at least 10 times and are spotless ...when i got it it had 270 and 25 poilet ....now i am at 300 and 27,5 ...seems to run good in first.... but when at half throttle or so i can hear it drop a cylinder and lose power ...any ideas i am willing to try had it for months and have yet to get it running rite

[firebanshee]

You could try new spark plug caps :cool:

[YA*AM*A*HEAD]

You could try new spark plug caps :cool:

i took a good known pair off of my srx 700 and there is no change ...and after riding again today ...i was off on my description ...if i hit the gas it hesitates to go for a second and than runs like a dream til i get to second gear and at wide open it goes for a second and than starts spuddering til i let off the gas to like half throttle or less ....and in 5 or 6 it is a dog dont want to hit the powerband and spudders bad ...

[Larry's Shee]

Yoy had 270 when you got it, now you have 300 mains. What changed that you went up on mains and pilot? How did it run with 270M&25P? Is air cleaner clean?

[YA*AM*A*HEAD]

Yoy had 270 when you got it, now you have 300 mains. What changed that you went up on mains and pilot? How did it run with 270M&25P? Is air cleaner clean?

yes had 270 and 25 in it ...it was dripping antifreeze on the stem and running hot so i was told jetting was lean and it had a bad bog ...i have gone back to a 290 and 27.5 and reset the floats and seems to be alot better but aint got anywhere to open it up to make sure ...i am thinking it might have just been bad fuel that was in it ...or the floats cause the were about a 1/16 inch too high ...thanks for all the help guys ill post back if it aint right but i think i am real close ...

 

[rmkboxer]

which clip is the needle at?

 

[YA*AM*A*HEAD]

which clip is the needle at?

in the middle position

 

[rmkboxer]

in the middle position

 

 

try dropping your needle one or two spots. midrange is the needle