carb woes

[ban1]

just got a used banshee that has these mods

coolhead w/18cc domes

vitos super stk pistons

boysen carbon fiber reeds

spacers

and 34 mm keihin flat slide carbs

 

here is my problem,about 1/4 throttle it has a serious bog (almost throw ya over

the handle bars ) and then takes off like a bat out of hell

 

changed main jets fron 128 to 120s

and pilots from 40s to 35s

moved needle clip down all the way and didnt make any diff

 

NEED HELP THANKS

[Wallynut]

If it's okay now, use that as a starting point, but if not, go back to the needle position and main that was in it before as your starting point. Seeing how you just bought it, I would do a WOT plug chop to see how the main is. To many people have blown motors not knowing they are running lean. 1/8 to 1/4 throttle is likely the pilot/air screw, with the needle setting overlapping @1/4 throttle. Do a seach on what others have been running for jets for your setup, there's quite a few running 34's. I know it takes longer, but try only messing with one circuit at a time to isolate your problem.

 

post what you have for pipes, air temps, and elevation.

 

I have found that with the warmer weather (finally), that I've needed to go leaner, just a suggestion.

[ban1]

i have bills pipes

temp is 80

elevation is about 4500 ft

 

 

plugs that were in it were BLACK & WET with fuel

plugs look better now but still a little dark brown

[rocketboy]

stop starring at your plugs and guessing what to change . its likely your pilot jetting .do the choke trick ,if it runs

better wih the choke out at 1/4 throttle then your lean on the pilots ,if it sputters and runs even worse your too rich on the pilots. put the needle in the middle before the choke trick too. also your way overcarbed for your mods and motor IMO and youll never get good bottom end out of those either.IMHO