Moose Racing 1003-1863 Carburetor Repair Kit 2019-2025 Yamaha YZ85 / YZ85LW

Restore Factory Performance and Precision Tuning

Modern ethanol-blended fuels are the primary enemy of high-performance two-stroke carburetors. Over time, standard gaskets swell and crack, leading to air leaks, erratic idling, and lean conditions that can put your engine at risk. The Moose Racing Carburetor Repair Kit is the definitive solution for riders seeing a loss in throttle response or inconsistent fueling on their Yamaha YZ85. At Moto-House MX, we specialize in keeping late-model race bikes at peak performance, and this OEM Replacement kit provides everything you need to return your carb to its original Racing Performance standards.

Every component in this kit is engineered for the rigors of competitive off-road riding. The O-rings and gaskets are manufactured from high-grade NBR rubber, a Heavy Duty material specifically designed to withstand the corrosive effects of ethanol found in modern pump gas. This kit is exceptionally comprehensive, including the needle, seat, float bowl screws, and mixture screw, along with OEM-sized jets to ensure your YZ85 or YZ85LW runs exactly as the engineers intended. Precision-machined for a perfect fit, these components eliminate the variables that lead to tuning headaches on race day.

Top Features: Moose Racing Carburetor Repair Kit

• Ethanol-Resistant NBR Rubber: Superior gasket and O-ring material that prevents swelling and degradation from modern fuel additives.
• Complete Rebuild Components: Includes all necessary O-rings, gaskets, jets, needle, mixture screw, and float bowl screws.
• OEM Standard Jetting: Supplied with factory-spec jet sizes to restore the original, crisp power delivery of your Yamaha.
• Float Valve Needle & Seat: Includes precision-ground needle and seat to prevent fuel overflow and ensure consistent float levels.
• Broad Late-Model Fitment: Specifically tailored for the updated 2019-2025 Yamaha YZ85 and YZ85LW (Big Wheel) models.

Pro-Tip: When rebuilding your carb, use a dedicated carburetor cleaner and ensure all internal passageways are bone-dry before installing these new NBR rubber seals to avoid premature wear.

Fitment List

Year Range	Vehicle Brand	Vehicle Model & Size
2019 - 2025	Yamaha	YZ85
2022 - 2025	Yamaha	YZ85LW (Big Wheel)

Frequently Asked Questions

Q: Does this kit work for the Big Wheel (LW) version of the YZ85?
A: Yes, this kit covers both the standard and the Large Wheel (LW) models for the specified year ranges.

Q: Are the jets included the same as the ones that came from the factory?
A: Yes, Moose Racing includes OEM-sized jets to ensure your bike maintains its stock tuning profile.

Q: Why is NBR rubber important for this kit?
A: NBR is highly resistant to ethanol; standard rubber seals often fail prematurely when exposed to modern pump gas, leading to leaks and poor performance.

Recommended Pairings: Moose Racing Throttle Cable, Performance Fuel Line Kit.

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