Banshee falls flat on topend

[g-rider]

OK guys, maybe you all can help me out.

I have a 2000 banshee that has been ported (Dune style by local builder), Cool Head with 20cc domes, V-Force 2 reeds, 35mm PWK's with K&N clamp-ons, I am running t3's uncut, the cylinders are bored .30 over with about 5 hours since rebuild, timing advanced to +4, anyway It pulls really, really hard from bottom to midrange and it will pull hard for a second on top before it falls flat. At first I thought it was running out gears too quick but I went to a 15/40 combo, so I think I should be alright there. I have tried larger mains and smaller mains and no help. I have tried Fatty pipes, T5's, Pro Circuits and the t3's and they all do it. I was wondering if it could be the port work. I don't know anything about porting like the specs and durations and all of that.

My carbs a currently jetting with 160 mains, 48 pilots and clip in 3rd grove on cel needles. and My elevation is around 1,000 ft. Any help is appreciated.

Edited July 17, 2006 by g-rider

[RILS]

OK guys, maybe you all can help me out.

I have a 2000 banshee that has been ported (Dune style by local builder), Cool Head with 20cc domes, V-Force 2 reeds, 35mm PWK's with K&N clamp-ons, I am running t3's uncut, the cylinders are bored .30 over with about 5 hours since rebuild, timing advanced to +4, anyway It pulls really, really hard from bottom to midrange and it will pull hard for a second on top before it falls flat. At first I thought it was running out gears too quick but I went to a 15/40 combo, so I think I should be alright there. I have tried larger mains and smaller mains and no help. I have tried Fatty pipes, T5's, Pro Circuits and the t3's and they all do it. I was wondering if it could be the port work. I don't know anything about porting like the specs and durations and all of that.

My carbs a currently jetting with 170 mains, 48 pilots and clip in 3rd needle on del needles (I believe). and My elevation is around 1,000 ft. Any help is appreciated.

That sounds pretty rich to me but im no expert with the keihin carbs been playing with mine since i put them on.Im running 34pjs with dune/drag port trinity pipes and clampons.Im at 145main 42pilot with a cel needle on the middle clip.

[g-rider]

I tried 150's and did a plug check and it showed it being lean. I might have 160's in it right now I really can't remember. It was acting like that with stock carbs on it running 340 mains and I was told I needed bigger carbs, so I put these on and it is still doing it, just not as bad. I am about ready to pull my hair out.

[RILS]

I tried 150's and did a plug check and it showed it being lean. I might have 160's in it right now I really can't remember. It was acting like that with stock carbs on it running 340 mains and I was told I needed bigger carbs, so I put these on and it is still doing it, just not as bad. I am about ready to pull my hair out.

Theres alot of differnt combinations people ru with these carbs.I was running 340s in my stk carbs and having the same problem and switched to the 34s and it went away pretty much.Im at abou the same elevation as you.About all i can tell you is get it in 5th gear hold it wide open for about 5secs pull in the cluch hit the kill switch and check the plugs keep doing this untill you figure out where you need to be.Its only going to pull so far and alot of it has to do wiyh your porting and pipes.Differnt port jobs will pull diffrent amounts of fuel so all you can really do is keep tring untill you get it at its best and thats about all it will do.

Edited July 17, 2006 by RILS

[g-rider]

I will check it again this weekend and see what I can do. I might just be expecting too much out of it I don't really know. If I could just get it to pull longer it would be great. I have just about figured it was in the porting. that is just my luck. I will be sending my next set of cylinders off to get them ported somewhere.