CBR 600F4 1999 - 2000 Honda CBR 600F4 Forum

Air / Fuel Mixture Screw Settings 2000 F 4

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Old 05-11-2014, 08:45 AM
nepelsopon's Avatar
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Default Air / Fuel Mixture Screw Settings 2000 F 4

All,
I'm looking for some assistance regarding the air/fuel mixture screws on the carbs of my by Honda CBRF4. I cleaned out the carbs thoroughly, replaced seals, etc. when the carbs we're put back on the bike, it wasn't running great on idle as it would shut off unless I open the throttle. I decided to remove again and clean the air/fuel mixture screws (grommet, washer spring).
I made the mistake of not counting the turns each was open as I removed them to clean.

Now the fun part. Put the air/fuel mixture screws in at 2-1/8 turns to start. The bike had trouble running idle until it warmed up.

Changed the setting after looking at the manual ( manual states to start at 3-1/8 turns out and then use a tachometer to find the highest RpM then turn in or out to drop RPM by 50 and from that point turn out another 3/4 turn)

Since I don't have the tach or he honda air/fuel screwdriver (90 degree bent) I can't do that.

I changed the setting to 3-7/8 turns out (3-1/8 plus the 3/4 turn done as the final step)
Runs better at idle, pulls great during takeoff up to 4k RPM. If you open the throttle, the bike has a hard time trying to move smoothly between 4k-7k. It really struggles to get from 70mph to anything above. Two times I heard a backfire while finally reaching 80mph.

Question -
Do you guys that have cleaned out your carbs have your air fuel mixture settings that you could share?

Additional Information :
Bike is stock
East coast - Maryland location


My next option is going to be to start at 3-1/8 turns out and see how that feels in comparison, but if someone could help it will be greatly appreciated.

Thanks.
 
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