Skip to main content
Diagonal view of red-and-silver FCR fuel mixture screw adjuster with spring, threaded collar, O-ring and numbered red knobAngled view of fuel mixture screw adjuster showing hollow knob, silver shaft, spring assembly, O-ring and '2' markingVertical close-up of red-and-silver mixture screw adjuster showing needle tip, spring, threaded collar, shaft logo and numbered knob

FCR Keihin Carburetor Fuel Mixture Screw Adjuster, Red Anodized Aluminum

Premium aluminum fuel mixture adjuster for FCR Keihin carburetors with numbered dial and easy track-side tuning.

Request Quote

Description

FCR Fuel Mixture Screw Adjuster

Brief Overview

This is a direct replacement for OEM fuel mixture screws on FCR Keihin carburetors. It solves a critical pain point for mechanics and tuners: accessing and adjusting the stock fuel screw without removing the carburetor. The numbered adjustment knob eliminates guesswork and allows repeatable settings—essential for track tuning, trail adjustments, or workshop diagnostics.

Key Features

  • Red anodized aluminum construction (7075-T6 specification) for durability and corrosion resistance
  • Numbered adjustment dial (1-2 visible markings) for precise, repeatable fuel mixture settings
  • Extended shaft design makes the adjustment screw accessible without carburetor removal
  • Silver-plated central shaft for smooth, consistent actuation
  • Complete hardware kit included:
    • One compression spring (stainless steel)
    • Two thin washers/spacers for proper assembly
    • O-ring seals for weather and fuel resistance
  • Knurled multi-lobed adjustment knob provides positive grip and prevents slipping during fine adjustments

Business Advantages for Resellers

This is a high-margin accessory with consistent demand among small-engine tuners, motocross shops, and powersports dealers:

  • Repeat customer base: Mechanics return for replacements and upgrades across multiple carburetors
  • Easy cross-sell: Bundle with other carburetor maintenance tools (cleaning kits, gasket sets, float bowls)
  • Professional positioning: Position this as the "shop standard" for FCR carburetor tuning—professionals expect access tools
  • Low inventory footprint: Compact, lightweight—fits easily in display cases or tool drawers
  • Service revenue driver: Use as a value-add when selling carburetor overhaul services

Technical Specifications

Specification Detail
Material Aluminum 7075-T6, red anodized
Shaft Material Silver-plated/polished steel
Spring Type Stainless steel compression spring
Accessories Included 2 washers, O-ring seals
Carburetor Compatibility FCR Keihin (direct replacement)
Adjustment Type Fuel mixture (numbered dial)
Surface Finish Red anodized with silver plated components

Why This Matters for Your Shop

The original FCR fuel screw is recessed, cramped, and difficult to adjust on a running engine. This adjuster extends the control point, adds tactile feedback via the numbered knob, and lets your customers fine-tune fuel mixture at the track without tools or carburetor removal. It's the kind of practical upgrade that builds customer loyalty—once a tuner uses one, they'll want them on every carburetor they maintain.

Stock it. Your powersports customers will ask for it by name.