[Bernie Blouin]

Hi Guys,Haveing a little problem with sooty plugs at high speed. I installed new intake manifold gaskets on a 1994 FXSTC. Cleaned the carb,installed new vaccum piston. High speed jet is 165 and the pilot is a 42. The needle jet is stock as well. The air fuel mixture control is at 1 1/2 turns. I did the plug chop method and everything runs well at idle,slow and midrange.The problem is when I fast accelerate or at high speed the bike seems to choke out and when I check the plugs they are black sooty the front plug being more than the rear .The only modification is Screaming Eagle slip on mufflers. Any ideas?????thanks,Bernie Blouin

[chucktx]

hi bernnie.........black or soot on the plugs is a sign of over fueling or not enough air.....i would take a close look at the aircleaner.....i believe you are not getting enough air at full throttle..........you are getting enough at idle and mid range, but starving for air at full throttle..........
chuck

[Bernie Blouin]

hi Chuck, I put in a new air cleaner and noticed the box is a little dirty inside but didn't pay much attention to it . I will check tonight.Is it possible that it might be the V.O.E.S. thanks, Bernie

[Bernie Blouin]

It would be a beautiful thing if it's the air box. I've had the carb off about a million times. Getting real good at it now haha.

[chucktx]

let us know what ya found, also, make sure the choke cable is staying in all the time.....maybe vibration is alowing it to close up some. there is a lock nut to adjust the tension with
chuck

[Bernie Blouin]

chuck, you da man. the inside of the back plate was oily and dirty,talk about a restricted air system.it still has a little skip at 85 or so.The rear plug looks great,the front still a little sooty but not bad. I'm going to drill a couple of 1/2 holes in the backplate.thanks,Bernie

[chucktx]

just glad we were able to help!!!!! have fun
chuck