Stator / Magneto Flywheel Rotor by Yamaha

Yamaha UTV/ATV & Side by Side Stator / Magneto Flywheels - Available at buywitchdoctors.com

Product Specifications: Genuine OEM Yamaha Stator / Magneto Flywheel Rotor, Part # 3B4-81450-00-00.

Keep your machine running like new with genuine Yamaha Stator / Magneto Flywheels paired with premium maintenance parts from buywitchdoctors.com. The flywheel, also called the magneto rotor, bolts to the end of the crankshaft and carries a ring of permanent magnets that spin around the stator coils to generate electrical power, while on many engines it also carries the trigger or timing reference for the ignition and adds rotating mass that smooths the engine. Because it spins with the crank at full engine speed, its condition directly affects charging output, spark timing, and engine smoothness. Riders most often replace a stator / magneto flywheel after a battery that will not charge, weak or inconsistent spark, a damaged or weakened magnet ring, magnets that have come loose, a cracked or damaged hub, a worn or damaged keyway or taper, a flywheel that has spun on the crank, metal debris collected on the magnets, a rubbing or scraped surface from a failed stator or bearing, or damage from water ingestion, overheating, or a hard trail impact.

Why Choose Genuine OEM Yamaha Parts?

Choosing original equipment manufacturer (OEM) parts ensures your vehicle maintains its factory-standard performance, reliability, and fuel efficiency. Genuine parts eliminate the guesswork of aftermarket alternatives, offering a seamless integration with your engine's configuration.

• Exact-Fit Design: Matched to Yamaha's original bolt patterns, sealing surfaces, and dimensions for a leak-resistant fit.
• Factory-Spec Quality: Built to the same standards as the parts installed on your machine at the factory.
• Peace of Mind: Skip the trial and error of universal or aftermarket parts that may not seal or align correctly.

Premium Materials & Precision Engineering

Crafted to strict factory tolerances, these components utilize high-grade alloys and chemical-resistant seals. This specialized engineering withstands harsh off-road vibrations, extreme temperatures, and modern fuel additives, preventing premature wear and leaks. The flywheel is made from strong, precisely balanced steel with a machined taper and keyway, securely bonded high-strength magnets, and accurate timing features, so it spins true, delivers consistent magnetic output, and holds its balance through high RPM, heat cycles, and constant vibration.

Comprehensive Model Fitment (2015-Current)

This genuine OEM part is engineered for a wide range of Yamaha side-by-side (SxS) and all-terrain vehicles (ATV) built from 2015 to the current model year. Please verify your series matches below:

Utility Task Vehicles (UTVs / Side-by-Sides)

• Viking Series: Viking 700 EPS, Viking 700 Ranch Edition, Viking VI EPS
• Wolverine Series: Wolverine R-Spec, Wolverine X2 850, Wolverine X4 850, Wolverine X2 1000, Wolverine RMAX2 1000 (Sport, XT-R, Limited), Wolverine RMAX4 1000
• YXZ Series: YXZ1000R, YXZ1000R SS

All-Terrain Vehicles (ATVs)

• YFZ Series: YFZ50, YFZ450R, YFZ450R SE
• Raptor Series: Raptor 90, Raptor 110, Raptor 700, Raptor 700R, Raptor 700R SE
• Grizzly Series: Grizzly 90, Grizzly 110, Grizzly 700 EPS, Grizzly 700 SE, Grizzly 700 XT-R
• Kodiak Series: Kodiak 450, Kodiak 450 EPS, Kodiak 700, Kodiak 700 EPS, Kodiak 700 SE

⚠️ IMPORTANT DISCLAIMER: Fitment can vary by production date and sub-model trim. Always verify your exact original equipment part number from your vehicle's schematic or consult a certified technician before finalizing your purchase to guarantee flawless compatibility.

Other Popular Parts & Secondary Accessories

• Stators: The stator is the coil assembly the flywheel's magnets spin around to make power. If your flywheel shows scraping, burn marks, or metal debris, inspect the stator windings at the same time, since the two wear and fail together.
• Stator Cover Gaskets: The stator cover gasket seals the cover that protects the stator and flywheel from oil, water, and dirt. Replace it any time the cover comes off so the charging components stay sealed and leak-free.
• Regulators & Rectifiers: The regulator / rectifier converts the stator's output and limits voltage for the battery. If your battery will not charge, test the stator and flywheel output along with the regulator / rectifier to find the real cause.
• Battery: The battery stores the power the charging system makes and supplies starting current. A weak or damaged battery can mimic a charging problem, so check its condition and replace it if it will not hold a charge.
• Fuses: Fuses protect the wiring that carries charging current. Check the charging circuit fuse whenever you chase a charging problem, and if a fuse blows right away, look for a short instead of simply replacing it.

Frequently Asked Questions (FAQs)

Q: How do I know when my Yamaha stator / magneto flywheel needs to be replaced, and how do I confirm the right one for my machine?
A: Look for a battery that will not charge, weak or inconsistent spark, damaged, loose, or weakened magnets, a cracked hub, a worn keyway or taper, a flywheel that has shifted on the crank, scraped or burned surfaces, and metal debris stuck to the magnets. Before replacing it, test the stator, regulator / rectifier, battery, and wiring, and inspect the crank taper and key, since these can cause similar symptoms or damage a new flywheel. Because flywheels vary by model, model year, and engine, confirm the correct part and the proper removal and installation procedure, including any special tools, using your Yamaha service manual or factory schematic, or contact us with your model and VIN and we will help you match it.

Q: How do mud, water, sand, and heat affect a stator / magneto flywheel on the trail?
A: The flywheel lives under a sealed cover, so harsh conditions affect it indirectly. Water or mud that gets past a worn cover gasket can corrode the magnets and stator and let debris collect on the rotor, while heat and old or low oil can stress the bearings and windings behind it. After a wet or muddy ride, check the cover and gasket for seepage or damage, keep breather lines clear, and watch for new noises or charging problems. Follow your Yamaha service manual for correct installation, sealing, and water-crossing guidance.

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Are You Looking to Find Great Places & Adventurous Trails to Ride Your UTV, Side by Side or ATV? Check out these highly recommended places:

• Northern Outdoors
• Imperial Sand Dunes
• Johnson Valley OHV Area
• Gypsum City OHV Park
• Leatherwood Off-Road Park