07 crf450 fcr carb or bored 03 fcr carb

[duneflyer1]

I want to bore my of fcr carb out to 43.5mm. I just heard that the new 07 CRF450 FCR 41mm carb is better then the bored older models. Anyone have info on this?

[2muchquad]

Why would you want to bore your carb out?drag racing? a stock 39mm fcr can give a modded 4 fiddy all the fuel it needs with better throttle response than an engine that is "over carbed".Bigger doesnt always mean better;)

[duneflyer1]

Originally posted by 2muchquad
Why would you want to bore your carb out?drag racing? a stock 39mm fcr can give a modded 4 fiddy all the fuel it needs with better throttle response than an engine that is "over carbed".Bigger doesnt always mean better;)

Well, I dont think honda would have went bigger on the new crf's (41mm) if it didnt help, plus, dyno's dont lie. My buddy with the exact motor/mods gained over a hp as well as torque with the bored carb.

[2muchquad]

Just because it may work on a bike doesnt mean it'll work on the quad.You might just end up with a big flat spot or lowend bog in the quad,they are heavier than bikes.Most of us dont ride dynoes.peak hp doesnt mean jack in the real seat of the pants world.

[duneflyer1]

I ignore the pk hp anyway. I follow the curve. I know what RPM my normal riding is in and know where I want my gains. I have done my homework and know what I want done. Plus, the bike that has the bored carb has no dead spots, or bogs as you suggest. Its power curve has a solid gain through low end upto the top. DASA does it, and am sure they have done enough R&D to see its value. Thanks for your concern, but I got it covered.