Just got an unridden 06 yz450f

usp4u1
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6/22/2024
Location
Chicora, PA US
usp4u1 5/2/2026 4:19pm
5/2/2026 4:19pm
FGR01 wrote:

You guys ever hear of this thing called an adjustable fuel screw on the FCR carb?

Yeah and the  dont work....

 

Play with the leak jet, play with the pilot, adjust on the accel pump timing....and add the o-ring.

Many of us have much knowledge on the FCR-mx.  They are excellent carbs.

 

Still make awesome power (beyond efi) and great rideability (close to efi)

2
30minmotos
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8/7/2025
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Rising Sun , MD US
30minmotos 5/2/2026 4:56pm
5/2/2026 4:56pm
FGR01 wrote:

You guys ever hear of this thing called an adjustable fuel screw on the FCR carb?

usp4u1 wrote:
Yeah and the  dont work.... Play with the leak jet, play with the pilot, adjust on the accel pump timing....and add the o-ring.Many of us have much...

Yeah and the  dont work....

 

Play with the leak jet, play with the pilot, adjust on the accel pump timing....and add the o-ring.

Many of us have much knowledge on the FCR-mx.  They are excellent carbs.

 

Still make awesome power (beyond efi) and great rideability (close to efi)

Honestly I think more times than not they are more rideable than stock efi on most bikes. Most efi bikes are super jerky off idle because of poor tps and poor mapping and it makes them tough to ride in corners.


Every where else efi is near flawless but that off idle tuning is more often than not really jerky on most newer bikes. 

 

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