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KEIHIN MAIN JET 90 – Manufacturer reference: 99101-357-0900
Keihin main jet sized 90, designed for carburetion adjustments on Keihin carburetors. A simple and essential replacement part to restore clean engine operation when the original main jet is worn, clogged, or when adjusting the mixture for specific conditions (altitude, fuel, tuning).
Brand: KEIHIN
Designation: KEIHIN MAIN JET 90
Reference: 99101-357-0900
Category: Jet / Main jet
Size: 90 (indicated size)
The main jet directly affects the air/fuel mixture at high RPMs and during throttle openings. Its replacement is part of regular maintenance and fine-tuning of the carburetion: it allows for adjusting the mixture richness for a more responsive engine behavior without modifying other carburetor components. Suitable for Keihin carburetors that accept a size 90 jet — check compatibility with your model before installation.
Installation advice: simple installation but recommended to be performed by a mechanic or experienced DIYer. Clean the jet well, check the condition of the seals, and conduct tests in safe conditions after any carburetion adjustments.
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