I finally got my banshee dialed in on the top end by doing a high speed jetting pass and checking the plugs. I ended up jumping a few sizes to get it right. When I bought the bike I was told it was factory jetted when the pipes and air filter were installed. It is a stock motor with pro design pipes and a K and N filter with Boyesen reeds. It never ran quite right and I finally realized the carb adjustments were way off. They were out of sync and didn't even go full travel. After sorting all of that out, it runs great at WOT but it still sputters a little coming off idle when rolling into the throttle. I have tried different needle clip positions but can't seem to find the right combination to get rid of the slight hesitation. Any suggestions on how to achieve the correct midrange jetting would be much appreciated.

 

Might try some different needles.Toomey needles are longer than stock.I have had pretty good luck with them.Might help.

 

What size jets are you using?

 

the toomey longer needles will work great, if you got to my "url" at the bottom i have a jetting page that can answer alot of your questions if not email me and i will help you out

 

I guess I had a brain fart last night when I posted this origionally, my bad. The pipes are Pro Circuit, not Pro Design. I also remembered as I lay in bed that I had changed the needle clip before I found the carb sync. problem. I need to change it back to the center groove and try it again, then go from there. Thanks for the link to the jetting page, I needed to see that part about the soft versus hard stumble off idle to know which way to go for lean vs. rich on the needle setting. I'll work with it some more this evening and see if I can get it better. I don't recall the size of my jets. I probably ought to do a WOT chop plug check again although it seems to be running great on the top end. I just want to get rid of the little stumble at 1/4 throttle. Just out of curiosity, does the engine kill plug check work at any throttle setting or just on top for the mains jets?

 

Not sure.Most people just do for top end I think.Might work?

 

Tonight I moved the needle clips back to the center grooves and now the Banshee runs like it should! Yippee! Now, if only it had about 100 more horsepower!

 

I'm in the process of building a 350 drag banshee.It should be around 90-95 hp.Be careful what you wish for.It is costing me a fortune.Wonder sometimes if it's worth it.We'll see if I ever get it done.