LECTRON Billetron PRO-4 32mm 4-Stroke Carburetor Upgrade Kit for CRF150R and other Small Bore 4T Motorcycles 

Engineered specifically for the CRF150R and other small-bore 4-strokes, the PRO-SERIES 4-Stroke Kit transforms your bike’s throttle response and power delivery. Designed to eliminate jetting hassles, it delivers a smooth, torque-rich powerband that adapts automatically to changes in elevation and conditions.

Its billet aluminum construction provides exceptional strength while the chrome-plated brass slide ensures long-term durability and precise metering. Combined with the Idle Fuel Circuit, the PRO-SERIES kit gives your CRF150R crisp throttle response, consistent performance, and a broader, more controllable power curve — so you can focus on riding, not tuning.

More Power. More Pull. No Jetting.

• The Lectron PRO-SERIES 32mm carburetor is the ultimate fix for riders tired of bogging, hesitation, and endless jetting problems. Built on our proven PRO-SERIES platform, it delivers stronger acceleration, cleaner fueling, and consistent performance - without jets to clog or tune.
• Featuring a 32mm high-velocity bore and our new Xcelerator™ metering rod, this carburetor delivers a burst of fuel the instant you hit the throttle. The result? Zero bogs, zero hesitation, and explosive acceleration that transforms how the bike rides.
• The Torque Jet has been relocated to the engine side of the carburetor, functioning as an external idle screw for quick, precise idle adjustments - no tools required. Combined with an integrated Power Jet and Lectron’s adaptive fueling system, your bike runs stronger and smoother in every condition.
• Each kit includes everything needed for an effortless installation - carburetor, throttle cable, and throttle assembly - so you can spend more time riding and less time wrenching.

 Who It's For:

For riders seeking consistent, reliable fueling performance on small-bore 4-stroke engines. This setup eliminates common issues such as off-idle bogging, inconsistent jetting sensitivity, and delayed throttle response. Optimized for 4-stroke platforms like the Honda CRF150R - it delivers stable air/fuel control across a wide range of operating conditions for smoother, more predictable power delivery

Includes:

• Black anodized PRO DRZ carburetor (Color options available for a $50 upcharge)
• Xcelerator metering rod (installed)
• Chrome plated slide
• Throttle cable
• Domino throttle housing
• NOTE: Grips are no longer included with this kit and will need to be purchased separately

Finish:

• Billet Aluminum, Anodized Black

Fitment: 

• Honda CRF150R /RB 
• Many other Small-Bore motorcycles 500cc and less