crf450 questions

[joeb23]

can I use the 450r header on the crf motor and a 450r carburetor one the crf?

[duneflyer1]

I am running a 450r header on my bike now. The carb will switch as well.

[gimp419]

if you run the carb make sure it's off an 06 or else you're killing the power potential of the CRF motor. The 04/05 carbs weren't anything to write home about but the 06 uses an FCR similar to what the CRFs come with stock. Most 04/05 TRX owners will run a CRF carb on there bike. But to answer your ? it should work.

Originally posted by gimp419
if you run the carb make sure it's off an 06 or else you're killing the power potential of the CRF motor. The 04/05 carbs weren't anything to write home about but the 06 uses an FCR similar to what the CRFs come with stock. Most 04/05 TRX owners will run a CRF carb on there bike. But to answer your ? it should work.

Say what???? All the CRF450R's used FCR carbs! Only until 2007 did Honda go to the 41MM size FCR carb. All previous years were 40MM.

[gimp419]

You're probably right all I know is that one of the most popular mods for the TRX when it came out in 04 was to throw a CRF carb, ignition and cam on it. As far as knowing for sure what carb was on the 04/05s I'm clueless, lol. Just trying to lend what little knowledge I have here.

The '04-05 TRX's used the butterfly style Keihin carb, in '06 they switched over to the FCR carb.

[joeb23]

I couldnt figure out why the crf450 had a 40mm carb until 07 and then the 450r had a 42mm carb in 04 and 05 then they switched it to 40mm on the 06 model. So I went ahead and bought a 05 450r carb.