MOTOKU Carburetor for Yamaha Bruin/Big Bear/Wolverine/Kodiak 250–450 — Direct-Fit Replacement, Improved Throttle Response

The MOTOKU carburetor is a direct-fit aftermarket replacement designed to restore smooth fueling and reliable throttle response on supported Yamaha Bruin, Big Bear, Wolverine, Kodiak and Grizzly 250–450 4x4 ATVs.

If your Yamaha ATV is hesitating at idle, stumbling under load, or showing uneven throttle response, a worn or clogged carburetor is often the culprit. This MOTOKU unit is built to match the fit and function of the original part for a range of Yamaha models and model years, offering a cost-effective way to get your machine back on trail without major engine work.

Which Yamaha models and years will this carburetor fit?

This MOTOKU carburetor fits a wide selection of Yamaha 4x4 ATVs across different displacements and generations. Confirm compatibility by matching your model and year to the list below before ordering.

• Big Bear 250: 2007–2009; Big Bear 400: 2000–2012
• Bruin 250: 2005–2006; Bruin 350: 2004–2006
• Grizzly 350: 2007–2014; Grizzly 400: 2007–2008; Grizzly 450: 2007–2012
• Kodiak 400: 2000–2006; Kodiak 450: 2003–2006
• Wolverine 350: 2006–2009; Wolverine 450: 2007–2010

How does this replacement carburetor improve ATV performance?

Replacing a fatigued or clogged carburetor restores consistent fuel delivery, which improves idle stability, throttle response and overall engine smoothness. The MOTOKU unit is manufactured to match OEM mounting points and fuel passages to minimize the need for modifications.

• Restores steady idle and reduces stalling
• Improves throttle response and acceleration consistency
• Maintains OEM-style fitment for easy installation

What should I check before installation to ensure a correct fit?

Before fitting the carburetor, verify your ATV model and year against the compatibility list, and inspect intake boots, gaskets and linkage for wear. Reusing damaged boots or seals can cause leaks and poor performance, so replace any worn peripheral parts during installation.

• Confirm exact model and production year
• Inspect intake boots, clamps and gaskets for damage
• Check throttle and choke linkages for smooth operation

What are the basics of servicing or tuning this carburetor after installation?

After install, start the engine and allow it to warm up, then fine-tune idle and mixture settings within small increments for best drivability. Periodic cleaning of jets and passages is advisable if the ATV sits unused or runs on old fuel.

• Warm engine before adjusting idle and mixture screws
• Use small adjustments and test throttle response between changes
• Clean jets if fuel contamination or varnish is suspected

This MOTOKU carburetor is aimed at owners and mechanics who need a reliable, affordable replacement that mirrors original equipment fit and function. It suits DIY ATV enthusiasts repairing older machines, fleet owners maintaining multiple units, and anyone replacing a leaking, corroded or failing carburetor to restore dependable operation. If you plan to keep your Yamaha ATV running smoothly without expensive shop repairs, this replacement carburetor is a practical choice—just verify model compatibility and replace any worn seals or boots during installation.