Say what are the TM 45 jetting specs for a Big Gun Pipe, K&N, open air lid, glamis riding, I have a 145 main in it now, AM I too lean???
but im getting some Back Fire on the top end. starts right up. idle great!

 

i would say try a larger main. 145 seems lean, u got a pipe that flows alot on top end. u got extra main jets? i know my ds likes the main richer than 145. needle clip about middle slot or higher.

 

145 is way lean for open airbox at sea level, lose the lid and the gasket under it and also the two snorkels, go up a size at a time and notice the gains, keep going up until you get no more gain, run a buddy you are close to up the longest climb glamis has each time you change and you will see the gains. my guess is you'll end up closer to 160. being that lean, you may have been faster with the stock carb.

 

I believe I run a 167.5 at Glamis.