450r carb

[gitrdonechevy25]

Hey is thier anything i can do to my carb on my 04 450r to make it flow better. Its all rejeted for my motor mods. Thanks

[TheBlasterMan]

you can bore it to make it bigger. Youd probally see more improvment with a taper bore.

Bigger isnt always better. Usualy increaseing the size of the carborator changes the low pressure areas. It tends to even decrease the velocity of A/F mix. Bigger carbs for bigger engines.

[GPracer2500]

Is anyone boring 04/05 TRX450R carbs? Seems like you'd need a new (larger) butterfly and I wonder about the slide. The 06+ TRX450R's FCR carb is a different animal and doesn't have those issues by way of its design.

AFAIK, upgrading an 04/05 carb is probably best approached by looking into replacing it altogether.

[gitrdonechevy25]

since mine is a kick start and has hot start can i put a 06-07 kickstart carb on mine since they are bigger and have hot start

[INFAMOUSRACER7]

No you cant bore a stock 04-05 carb, if you can find a carb off a 07 kick start it would work but i think the air boot on the 06-07 is bigger or smaller then the 04-05 so you would have to modify your air box for it to work. your best bet is to get a crf450 carb off like an 04 and get the noss machine carb adapter for it