CB125S Jetting

Jmunk

New Member
I picked up a 1975 CB125S not running. I’m soaking the carb and ordered a Keyster carb kit.

The jetting in the carb was 38 idle jet and 98 main jet. The Keyster kit came with a 105 main and 38 idle jet.

I believe the jets that came in the carb are possibly original given the bike has 123 miles on it.

The carb has 660A stamped on it.

Can anyone confirm which main jet to use. It’s going be running the stock air intake setup.
 
Use the stock or replacement OEM jets and the OEM needle. Keyster parts often have a different needle taper.
 
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