Banchetta

Ditto, And after all the bullshit they put the shee guys though over the years, they now have it on the yfz...

35's. No doubt. 4 mils like to breath. The larger the carb, the better they go.

For tight trails, I'd run the PT Mids hands down, but the fmf gnarlys would be my next choice..then fattys and T5's...Depends on the type of trails. Mids and Gnarlys for technical riding. Fattys and T5's for more open trail riding..

Couple of things. Try new plugs. Also, make sure the choke tube between the carbs is still there. Thats where I'd start.

Yes, there is a brass screw on the side of both carbs, make sure you keep both carbs the same and make sure the carbs are cleaned w/ compressed air through the ports. After your done, make sure the carbs are synced. This will make a big difference in throttle response and idle.

They are both comparable pipes. The shee I jetted w/ Bills pipes came in smooth and early and revved nicely as well. I really liked them powerwise for all around. The fattys are a nice pipe as well. Both jetted correctly will give you the same pull. I'd say its personal preference for sound and finish.

Not sure on your setup, but I know the 4 mils w/ stock jugs like 162-172 mains, 48 pilots. Most cub cylinders like 148-155 mains, 45 pilots. So your guess is as good as mine.

Single carb on the 4 mil will hold you back. Get a second 35pwk and you'll see huge gains. The 4mil likes to breath...I'd start w/162 mains, 48 pilot, dej needle 3rd clip..

Sounds to me like the mains are plugged. You might have a grain of sand or slime in the jet. Blow it out and you'll be fine. I'd still step up the main though for the k&n.

I run at sea level, 70 degrees. I ran this setup in Glamis and in Saco, Maine. This was w/ the pt mids. I later went to the shearer pipes and ended up w/ 172's...JKJK has a 4mil w/ 28 pwk w/ T5's. He was also running 162's...We both jetted our shees individualy and shared info later. Lean motors will rev, but not pull. Rich motors will drop out of powerband and bog like the choke is on..Properly jetted shees will pull harder than lean jetting..

Its a 3-wire plug by the front left exhaust pipe. Unplug it. Its supposed to act like a rev limiter in case your throttle sticks open..They fail all the time and cause the motor to act like a rev limiter. I've also seen them cut off the spark 100%..I've seen shees only 1 year old have them fail...They're junk and useless..Trust me.

Loco, Why is it, you ALWAYS have the hottest pics under your name??!! I'm shopping for a graphics kits for my newer yfz and want something custom...HOOK ME UP!!! I want something masciline, but seductive. Any ideas?

Your shee likes the 140 main jet?? I'd think your way too lean, I was running 162's in mine. I'd definately start up and work down from there. Hey loco, when are you gonna hook me up w/ some graphics for my quad??

Have you disconnected the tors yet?? Takes 2 seconds and saves a lot of headaches. The needles are located under the carb tops. Pull the spring back and shake the gold clip out. The spring will now come off and you can get to the 2 philip screws. Take them out w/ the metal piece. Your needle will now come out. There are 5 clips. Stock setting is the 3rd clip. Most fmf pipes like the 4th clip from the top (blunt end)...Porting can throw that off though..so you might need to be at the 2nd or 3rd clip...I'd check the tors first though.

Your right on the most part. Smaller carbs have faster air flow, so they pull more fuel out of the jets. HOWEVER, I've dynoed 28mm,33mm,34mm, and 35mm keihin carbs on my 4 mil shee...All 4 sizes liked the same main jet size. Ironic but true. The larger the carb, the more power increase. I actually gained more bottom end, then top end w/ the 35's...So when people say larger carbs only give you topend. Its not true. A properly jetted carb will gain all around if sized right. Good luck. 162 mains, DEJ needles on the 3rd clip, 48 pilot.