
This part being universal, it may require adaptations
KEIHIN Fuel Mixture Screw Spring — Manufacturer reference: D300CRB50632
A simple yet essential part for anyone working on carburation: this fuel mixture screw spring from KEIHIN maintains a consistent tension on the air-fuel mixture adjustment screw. Designed for KEIHIN carburetors, it is aimed at motorcyclists who maintain, repair, or optimize their carburation for more stable operation and more precise adjustments.
Whether you are performing a complete carburetor overhaul, replacing worn parts after many miles, or preparing for a restoration, this spring resumes its role of keeping the screw in the correct position despite engine vibrations. Easy to install, it fits directly around the mixture screw to ensure constant support and a precise return of the adjustment.
Before installation, check compatibility with your KEIHIN carburetor model and follow the manufacturer's or your workshop's recommendations. A small part with a big impact on adjustment precision — a must for those who care about their carburation.