My shee is not runing right when it is Cold or worm the Left side will not fire but when it is real hot it runs real good.
And if you stop riding and let it cool down the left side will not fire again and I have to put in new Plugs in and get it real Hot so it will run right again. And I have to run it at WOT all the time.
The plugs are a nice Chocolate Brown color.

 

a nice chocolate brown color prob is ur worst enemy right now.. ur prob runnin way to rich! try going down a bit on the jets and then put some new plugs in and see if it runs better. the warmer it is the leaner it will run and the colder it is the richer it will run

 

Last summer I was runing 270 Main Jets and it ran good and over the Winter I did some porting with race logic and I am still running the 270 Main jets.

 

If it was the jets it seems it would affect both sides?

 

not intirely .. maybe one side is suckin to much in or maybe sumthing i dont know i would just think that a jetting change would fix that.. give it a try

 

I will go down to 260

 

yeah give that a try then tell us whats going on.. i dont own a banshee but from my understanding and from what u have said that sounds like the problem..