Mikuni TM38-86 Flat Slide Carburetor 38mm Bore 43mm Spigot Mount

The Mikuni TM38-86 is a high-performance flat slide carburetor from Mikuni's renowned TM Series, engineered to deliver superior throttle response and fuel metering over conventional round slide carburetors. With a 38mm bore and 43mm spigot mount, this carburetor is a popular upgrade for off-road motorcycles and powersports applications demanding precise, responsive fuel delivery.

The TM Series flat slide design creates a smooth bore effect that allows air to flow faster and more efficiently through the venturi and jet blocks. This increased air velocity generates a stronger vacuum signal at the needle jet, resulting in more accurate fuel metering across the entire RPM range and noticeably improved throttle response compared to older round slide units.

Key Features:

• Bore: 38mm flat slide design for smooth, unrestricted airflow
• Spigot Mount: 43mm for secure, leak-free engine fitment
• Main Jet: 230
• Pilot Jet: 22.5 for precise low-speed fuel delivery
• Needle Jet: 389 Q-2
• Throttle Valve: 4.0
• Jet Needle: 6FJ41
• Flat slide construction creates smooth bore venturi effect
• High-velocity airflow improves vacuum signal at needle jet
• Direct replacement or performance upgrade over OEM round slide carburetors

The Mikuni TM Series is a trusted choice among powersports enthusiasts and professional tuners for its tunability, reliability, and measurable performance gains. All jets and needle specifications are factory-set and fully adjustable to suit a wide range of engine configurations and riding conditions.