I have a 99 banshee with toomey t5 pipes, boysen power reeds, reed spacers,rejetted carbs, and a 4 degree timing key. now my banshee is starting to back fire and spit@sputter from the right cyl. I need some ideas on how to try and fix. I dont whant to take it in to the dealership if i dont have to

 

It could be a bunch of things...the first thing I would do is a compression test.... That's always where I start..If the pounds are in check...then start looking for air leaks.
-Header tight up against engine
-Carb boot pop free?
-top of the carb is good and tight?

Assuming it was running fine before...no jetting changes.
- is the outside temp drastically different than normal?
- Have you changed fuel or premix?
- are the plugs fresh?
- filter clean?
- Are the carbs in sync?

just some things to think about

 

you probably just need to rejet it because its probably running lean if you havent