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Old September 10th, 2020, 10:53 AM   #13
DannoXYZ
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Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011

Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C

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MOTY - 2018, MOTM - Nov '17
Yes, getting 1/2 of typical mileage is sure sign you're dumping too much petrol into engine. If you're already at less than stock adjustment on mixture-screws and it still appears to be too rich, it would indicate something beyond external adjustments.

So most likely there's something non-stock inside carbs themselves. Non-stock jet sizes, perhaps even non-stock needles and/or heights. This is most likely issue since most common issues are in opposite direction with clogged jets & circuits causing lean mixtures.

Don't assume printed number on jets is actually what's being used. You'll want to measure jet-sizes by inserting soft-copper wire of increasing size until you find one that's snug. Then measure wire with micrometer/calipers.
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