I have a 87 trx, ported, pipe, shaved head, ect. I currently run a 37mm pj and it runs hard but keihin doesnt even make the pj any more and I was thinking of upgrading but I cant decide between which carb to get, the pwk airstryker or the pwm. I heard the pwm makes more power on the bottom acording to LRD but the pwk is what most people run. Or maybe my pj is so close to the newer carbs, performance wise, it isnt even worth the money to upgrade? Any experienced suggestions would be appreciated.

thanks