I need help i have a700 with a big gun.diamond g snorkle twin air I tried every jet size from 138 to 155 (in back)and iam still getting smoked by my buddys 650 any one with bigger jets than this with similar mods Im at 152 155 now i think i need to go bigger it backfires after full throttle.

 

This is about the BigGun pipe, I didn' put one on my P700 but I put one on my 660 Grizz and had the K@N filter and rejetted many times I also moved the main needle up and down trying to get that extra power. There is a long simi steep but smooth pipeline hill behind my house, starting from the same spot I would run WOT from there till I toped the hill and kept an eye on the speedo. I discovered that the BigGun made the Grizz slower than with the stock pipe. I think the BG doesn't produce the correct backpresure to let the engine run properly, but this was on a Yamaha (sory bout that) and the Kaw may react diffrently all I'm saying is you might want to do a test like I did jest for $hits and giggles. Good luck. And I was mad as heck that I spent over $300 to go slower!

 

Thank man but i dont want to give up with it yet anyone with any big jets in there p 700

 

Sound like you are still running to lean . If your bick is backfiring on deceleration it is lean . But your pipe may cause it to back fire . I work on bickes for a living and see this problem all the time . But with a little time you will get it right . Before you get bigger jets try raising your needles and that don't work step up two or three sizes set your needles back down . It takes time to get them right . I have a p650 runs great and I love it . Hope this helps .