Thread: Carb issue
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Old December 3rd, 2019, 12:39 PM   #12
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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Quote:
Originally Posted by Detrailers View Post
FIXED! So today I replaced the leaky float needle, put everything back together and it runs great. This along with cleaning and backing out the mix screws, and synching the carbs and it starts and runs smoooooth. Didnt do the 108 mains because the general consensus is it doesn't need it, but I think putting a shim under the needle helped, midrange feels much better.
Good job! Yeah, going to bigger main jets is hail-mary attempt after not being able to properly clean carbs. Which is what most people do and it "works", so problem was factory jets were too small right?

Well, bike ran fine when brand-new leaving showroom floor, with factory-fresh clean carbs. So there's no reason other than clogged carbs that would cause them to not run like factory-fresh bike (assuming valve-adjustment is correct). Main-jets don't affect idle and off-idle behavior much anyway. Most of that idle and off-idle behavior is adjusted by pilot-screws. So after thorough cleaning back to factory-fresh condition (not possible without ultrasonic and micro soda-blasting), you'll just need to ensure carbs are synced and adjust pilot-screws for "best idle" behavior.
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