mc4mill

I was referring to when I was running the 28 keihins. I just pulled the stock carbs off today, adjusted the timing to +2, This solved my problem. Thanks for the help! Banshee HQ saved my ass!

Thanks I'll try that!!

I've gone as lo as 158mains, should I try lower?

I've tried that. it gets slightly better as I raise the clip. It likes the top clip best!

Yes! it comes out of it or drop a gear. I don't know about to much gas.

Sorry! Stock carbs, no tors , bored to 27mm. 330mains 27.5 pilots, n57 middle clip. White knuckle head, 180psi compression,dune port T5s, fmf silencers. sea level. klotz 40:1

Tired of throwing money into this pig, It's killing me!!! Any and all comments and opinions whould be appriciated. Here is my story. I bought this 99 shee 2yrs. ago. It is a 4mm. It originally had lectron carbs, stock milled head,Full race port, T5 with cascade silencers. I have removed the lectrons, Installed 28 keihins, +7 timing, race gas. Carb change was to get more low end and less light switch. I had it dyno tuned by a local shop, They did some basic mods, Cleaned up the power curve etc... My biggest complaint was a spudder between 1/4 & 1/2 throttle. I'm a dune rider and occasionally drag for fun. Emphesis on duning. Sea level 45 to 80 degree temps. Same results, I've tried every jetting combo, narrowed down to needle, jjh and n65a the only way to clean the spudder is seting clip at the very top. Doesnt matter what needle, same result. So I talk to the shop that dynoed it, He questioned my port timing might be causing this issue. Since then I wasted a crank bearing, and fried the top end. I had the porting looked at by 2 people they both told me the same thing I decided to ditch the race ported jugs, bought stock jugs and had them mild or dune ported, Had the bottom end completly rebuilt by same person. After breaking it in as per builder, Guess what! Same problem! 45 pilots, jjh middle clip, 162 mains. The bike runs hard, but still spudders 1/4 to 1/2 throttle. I call builder, He thinks possible electrical issue, So I've replaced coil and wires with plug caps. no change. swapped stators, nothing! swapped cdi, nothing. Same results. I also checked every wire connector and wire in harness. cleaned all ground connections. I dont think its electrical. Builder reccommends stock carbs, says they are more forgiving. Tried them, same problem. I've also removed the cascade silencers, installed fmf silencers, thinking of trying different pipes. My thing is the money has dryed up! If I run the needle with clip in top position will it pop the top end? What the F---

Thanks! Yea I started with a jjh needle, was advised to use the N68A by two different sources. Although I never went lower than the middle clip. I gotta tell you, My shee has ligit low end, If I can solve this issue, I'd be jacked!

I tried that, It ran worse!

I'm so confused on what to do! I'm trying to tune my shee, last 3 rides I tinkered on this thing to try to and dial in, To walk away fucking pissed! All the other dudes I ride with are stumped and recomend I take it to a shop to have it dyno tuned. I'm fairly new to working on banshees, But this mod I figuired I could handle. If any body can help I would be gratful. My shee goes like this: 4mm. standard bore, shaved head, 150psi compression,full race port, case matched. +5 timing, T-5w/cascade silencers. 110 oct. race fuel. The mod I'm attempting to do. Remove the 34mm Lectrons and Install 28mm pwks using the same boysen reeds etc. My reasoning for this, I was told it would give my greater low end power, and take away the "light switch" hit. It definetly did that! To my liking, What I'm not able to solve is the 1/4 to 3/4 throttle crackle/ churpyness before the main takes over. I use my shee on the Oregon dunes only. sealevel, 50 to 75deg. pilot jet 48, needle N68A, leaned on top clip. This is where it runs best at. Main 160. I've tried many variations and combinations. Please advise!!!

I'm now starting to wonder if I went to small on the 28mm pwk's, I.E. Am I starving it for air? Most people recommend 33 or 34's with a 4 mm. Another thing I found was my flywheel case cover had standing water in it. I know this is not good, what issues could this cause. Thanks Mike

Performed a leak down, It holds 6 lbs. But slowly drops to 5lbs. in about 12 mins. Is that exceptable?

162 mains, 52 pilots,needle at top clip. sealevel. 55-70 degrees. I think I need to do a lead down, The idol is not consistant, Your thoughts?

Purchaced 4mill, stock cylinder w/raceport. milled stock head, 150 psi. plus 5 timing. 110 race gas. Had lectron 34 carbs, Ran like raped ape. Got tired of the light switch, Removed lectrons, Installed 28pwks. Have great low end, Can't seem to dial in needle, Wants to spudder under lugging conditions, Have the needle leaned as far as possible. Not sure if this is normal, should I advance the timing to 6 degrees?