NICHE Starter Motor Assembly for Yamaha Grizzly, Rhino & Kodiak — OEM 4WV-81890-00-00, 9‑tooth High-Torque

NICHE Starter Motor Assembly is a high-torque replacement starter specifically engineered to fit Yamaha models using OEM numbers 4WV-81890-00-00 and 5KM-81890-00-00, delivering reliable cranking performance and direct-fit installation.

When your Yamaha ATV or UTV needs dependable starting power, this NICHE starter motor assembly offers a purpose-built swap that matches OEM fit and function. Designed for a range of Yamaha Grizzly, Rhino, Kodiak, and Wolverine machines from model years listed below, the unit emphasizes strong torque, durable carbon brushes, and a 9-tooth pinion for consistent engagement. It’s intended as a straightforward replacement that reduces downtime and restores starting reliability without extensive modification.

Which Yamaha models and OEM part numbers does this starter replace?

This NICHE starter is compatible with the listed Yamaha OEM numbers and a broad set of models across several years. Confirm your vehicle’s OEM part number and model year before purchasing to ensure proper fit.

• Replaces OEM part numbers: 4WV-81890-00-00 and 5KM-81890-00-00
• Fits Yamaha Grizzly 600 (1998–2001) and Grizzly 660 (2002–2008)
• Fits Grizzly 450 (2007–2010) and Grizzly 400 (2007–2008)

How does the motor perform compared with the original equipment?

The assembly is built with a high-torque motor that is engineered to meet or exceed OEM torque and operational specs. Its carbon brush design and cycle rating aim to provide a long life and consistent starts under typical riding conditions.

• High torque output rated at 2.8 Nm for strong initial cranking
• Carbon brush type for reliable electrical contact and wear resistance
• Cycle rating around 10,000 cycles to support extended service life

What mechanical details should I check before installing?

Inspect the pinion teeth count, rotational direction, and electrical connectors to ensure compatibility. Correct mechanical match prevents engagement issues and preserves starter and flywheel integrity.

• Pinion with 9 teeth for proper engagement with flywheel
• Rotational direction: counter-clockwise as specified
• Verify mounting holes, bolt pattern, and connector types against your vehicle

What vehicles beyond Grizzly does it fit and what are the practical benefits?

Beyond Grizzly models, this NICHE starter is suitable for Rhino, Kodiak, and Wolverine model ranges noted in compatibility. Buyers benefit from a direct-replacement solution that reduces install time and restores consistent starting behavior for work and recreational use.

• Rhino 660 (2004–2007) and Rhino 450 (2006–2009)
• Kodiak 400 (2000–2006) and Kodiak 450 (2003–2006, 2018–2024)
• Wolverine 450 4x4 (2006–2010) compatibility

Who is this for: This NICHE Starter Motor Assembly is aimed at owners, mechanics, and fleet managers who need a dependable, OEM-compatible replacement for Yamaha ATVs and UTVs listed above. It’s suitable for riders who prefer a direct-fit part to restore starting reliability without custom modification, and for shops that require a quality aftermarket option that aligns with OEM specifications.

Features summary:

• Compatible with Yamaha OEM part numbers 4WV-81890-00-00 and 5KM-81890-00-00
• Fits multiple Yamaha Grizzly, Rhino, Kodiak, and Wolverine years and models
• High torque motor engineered to meet or exceed OEM specifications
• Carbon brush type, 2.8 Nm torque, ~10,000 cycle rating, 9 teeth pinion, counter-clockwise rotation