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Keihin 99101-124 meters air in the slow-air circuit of FCR and FCR-MX carburetors, affecting the transition off idle. Also known as 99101-ZF5, this series has separate CVK applications. It measures 8.5 mm overall with an M7 x 0.75 thread.
The standard FCR-MX37, FCR-MX39 and FCR-MX41 setting uses a #100 jet. Match the jet series and size to your carburetor; N424-33 is a different slow-air jet series.
- FCR-MX exploded view reference: 30
Notice
Before You Order — Measure Your Jet First
Remove the jet from your carb and physically measure it. If it does not dimensionally match this listing, this is not the correct jet — do not buy it.
Buyer is solely responsible for confirming the correct jet size before purchasing. Do not rely on year/make/model fitment guides — they cannot be guaranteed 100% accurate.
All jet sales are final. No returns or exchanges — no exceptions.
