Honda XR600 & XR650 Mikuni TM40-6 Flatslide Pumper Carb KIT

Mikuni TM40-6 Pumper Carb Kit – Honda XR600 / XR650

Going fast has never been so easy. Say goodbye to hard starting, hesitation, and flat spots with the Mikuni TM40-6 Pumper Carburetor Kit, precision-engineered for the Honda XR600 and XR650. This complete kit is a direct-fit upgrade, providing instant throttle response, smoother acceleration, and substantial gains in horsepower and torque.

Complete Kit Includes:

• Genuine Mikuni TM40-6 flatslide pumper carburetor

• Pre-installed silver anodized airbox adapter

• Pre-installed engine outlet spigot adapter

• 1/4-turn quick action throttle and throttle cables

• Cable choke installed, plus optional knob choke included

• Main and pilot jets installed, with a range of extra jets included for fine tuning

Built for Easy Installation & Custom Tuning

These Mikuni carbs are properly sized and pre-fitted with adapters to match your XR’s airbox and intake flange. No fabrication needed—just bolt on and go. The included jetting kit makes tuning straightforward, accounting for variables like:

• Climate and elevation

• Fuel octane and density

• Aftermarket cams, exhaust systems, and head porting

We include a range of jets to help you dial in the perfect setup for your specific riding conditions and build.

Proven Performance Gains

Dyno tests have demonstrated power increases of 25% or more when fitted to stock Honda XR600/XR650 engines. Riders report:

• Faster throttle response

• Stronger low- and mid-range power

• Improved rideability across the rev range

• Elimination of bogging, stalling, and flat spots

Upgrade Your XR Today

Whether you’re racing, trail riding, or just want more power and control, the Mikuni TM40 Pumper Carb Kit delivers modern performance to your legendary XR platform.