banshee 1 cylinder not running rite.

[joe schmo]

My first banshee and i'm new to banshees.. I tried other forms (it's a 4wheeler:/),with no help at all..I have a 99 that was running good but the sprocket and shifter seals leaked, then I rebuilt it. now after build the one cylinder some times runs then brakes up, in neutral it will rev out ok on both. if i hold the gas at the rite spot the left stator side brakes up,same if i drive it but in powerband its ;ok if i can get it in when i'm riding it. I have new rings and lite hone job 150psi on each,new gaskets with All seals,leak down test it held 6psi for 10min then I let the air out.....new plug's,I switched the spark plug wires,checked the reeds,cleaned the carbs 3 times, the brass ball in the bowl is on choke lever side,slide cut outs on air filter side,coke tube is clear,carbs synced,tors kit with the tors unplugged also is the parking brake, the whole exhaust is clear..I even used a other set of stock carbs with stock and same jett size..I have fmf fattys headers with paul turner tips,prodesign kit with k&n filter no lid,i think stock carbs with 310 main jets and 30 pilots.. I'm sure I forgot some things,Thanks.

[bansheekx]

Have you tested the stator? Pickup gap set correctly?

[joe schmo]

Thank you,yes I did..The side with the line i set at .018 but when I turn it to the other side the gap is a little bigger..stator tested ok with a good ground..I have a pair from the deal but the 87 has no motor but every thing else. She ran good before I built it.

[bansheekx]

When it's running on one cylinder try pulling the choke out a little to see if it will start firing the dead cylinder. If that works you have a carb problem. You may also want to check the spark plug caps.

[joe schmo]

Thanks,I tried the choke and it got worse.

[bansheekx]

The best advise I can give you is to check the whole electrical system out. If you don't have a manual here is a link below that will show you how to check the whole system.

http://www.dfn.com/agservices/elecfaq.html

[joe schmo]

Thank you..sorry I meant to say I swapped every thing over from the 87(even the stator plug) and its the same..

[MTS]

Sounds as if you may have bent the lower compression ring upon install...had a twin cyl sled do something very similar..it was to the point it would not run at idle on one cyl.

[brd812]

I'd say it's the carbs, check the carb on the dead cylinder . Are they stock carbs? If they have separate chokes try them by themselves first. If that doesn't help clear up the identification, switch the carbs and that will tell you if it's carbs or electrical. Good luck it not fun chasing gremlins w/ cylinders.

[joe schmo]

Thanks,I will check it..Will I still have 150psi on it with a bent ring? I'm totally lost!! lol.......I cleaned the stock carbs 3 times also used a other set of stock carbs with stock and same jets,also swapped the hole electrical system from the spare one.....Damn Gremlins!!!!

[MTS]

Yes, just taking into account you seem sure everything else is ok, would leave me to belive so, you could use a timing light to see if your losing ignition on that cylinder, one other thing yamahas sometimes have the ground wire in the kill switch un insolated and will arc to the bars, im not real familiar with banshees but it may be worth a look, might have to tape the bar before tighting down the switch, this is a consistant problem with just one cyl correct?

[RIDE-RED 250r]

I don't know if a Banshee has 2 separate CDI's or 1 single..but have you tried any swapping around with CDI's???

I had a Ski-Doo triple that would do that.. Cleaned all the contacts and connections for the small wires connected to the coils and the problem went away.

Your issue sounds electrical to me... Just going off some experience I have had with twin and triple cylinder sleds.

[joe schmo]

Yes, just taking into account you seem sure everything else is ok, would leave me to belive so, you could use a timing light to see if your losing ignition on that cylinder, one other thing yamahas sometimes have the ground wire in the kill switch un insolated and will arc to the bars, im not real familiar with banshees but it may be worth a look, might have to tape the bar before tighting down the switch, this is a consistant problem with just one cyl correct?

I will have to take it apart and check the rings and end gap again.I don't have a timing light I should get one again,I swapped the spark plug wires and same problem on the same side..I also will try e-tape on the bars and yes this problem ever since the re-build but not before.. Thanks.

[joe schmo]

I don't know if a Banshee has 2 separate CDI's or 1 single..but have you tried any swapping around with CDI's???

I had a Ski-Doo triple that would do that.. Cleaned all the contacts and connections for the small wires connected to the coils and the problem went away.

Your issue sounds electrical to me... Just going off some experience I have had with twin and triple cylinder sleds.

Only one CDI,I swapped the wiring harness,CDI,spark plug coil and kill switch..thanks.

[RIDE-RED 250r]

Only one CDI,I swapped the wiring harness,CDI,spark plug coil and kill switch..thanks.

OK, that's all I have... Good luck bud! Hope you get er straightened out....