Make adjusting your fuel mixture easy with this finger turn screw. KEIHIN FCR 4 STROKE CARBURETTOR FUEL SCREW FITS MOST 4 STROKES WITH KEIHIN CARBURETTORS HONDA CRF KAWASAKI KXF SUZUKI RM-Z YAMAHA YZF KTM SX-F KTM EXC-F These fuel mixture screw will fit most Keihin FCR carburettors but not all. Please check the compatibility with your OEM carburettors and original mixture screws before attempting fitting.