Parts Unlimited Starter Motor – Suzuki LT80 (1987‑2006) / Kawasaki KFX80 & KSF80 (2003‑2006)

OVERVIEW

Reverting your quad to proper engine turnover speeds requires a starter that engages instantly under load, which is why this Parts Unlimited starter motor was engineered as a direct factory replacement for aging Suzuki and Kawasaki engines. Designed specifically for the Suzuki LT80 and Kawasaki KFX80/KSF80 platforms, the unit rebuilds reliability into small-frame ATVs through precision-manufactured internal components and fully enclosed hardware. Sealed mechanisms and specialized metallic housings protect the drive system from mud, debris, and moisture during aggressive trail use.

ENGINEERING & PERFORMANCE

This starter relies on robust copper-to-bronze bearing interfaces that maintain precise shaft clearance throughout heavy rotation cycles, preventing premature wear under ignition strain. The inclusion of an insulated armature and comprehensive rubber sealing at both top and bottom housings ensures that electrolyte exposure and track grit do not compromise electrical continuity or mechanical movement. Built to meet or exceed original equipment dimensions, the assembly bolts directly into the existing transmission case interface without requiring modification. The hardened contact surfaces and corrosion-resistant finishes allow consistent torque transfer while maintaining tight internal tolerances over thousands of cranking events.

KEY FEATURES

• Direct Replacement: Replaces O.E.M. part numbers 21163S003, 31100-40B00, 31100-40B01, LT80CS90, and SM10230.
• Insulated Armature: Prevents ground faults and stops rust buildup along the coil windings.
• Dual-End Rubber Seals: Gaskets on the top and bottom sections keep moisture and dust away from internal drives.
• Copper Bushings: Constructed with durable 90/10 copper alloy bearings designed to extend overall service life.
• Corrosion-Resistant Build: External components utilize protective coatings to survive prolonged exposure to humid and wet riding conditions.
• Matched Engineering Standards: Manufactured to satisfy or surpass the original equipment manufacturer dimensional specifications.
• Precision Gear Interface: Teeth and pinion spacing match factory flywheel geometry for clean engagement.
• Platform-Specific Design: Optimized mounting flange and shaft length for Kawasaki KFX80, KSF80, and Suzuki LT80 frames.
• Long-Term Durability: Heavy-gauge casing supports vibration resistance typical of high-torque quad sport usage.

TECHNICAL SPECIFICATIONS

• Brand: Parts Unlimited
• Part Name: Starter Motor
• Component Type: Starter
• Bearing Material: 90/10 Copper Bushings
• Sealing Type: Rubber Top and Bottom Seals
• Armature Feature: Insulated Coils
• Filial Compatibility: Kawasaki KFX80, Kawasaki KSF80, Suzuki LT80 QuadSport
• Supported Years: 1987–2006 (Suzuki), 2003–2006 (Kawasaki)
• Equivalent Part Numbers: 21163S003, 31100-40B00, 31100-40B01, LT80CS90, SM10230

FITMENT

• Suzuki LT80 QuadSport (1987–2006)
• Kawasaki KFX80 (2003–2006)
• Kawasaki KSF80 (2003–2006)

WHY RIDERS CHOOSE THIS

Riders select this specific Parts Unlimited starter because it solves the common issue of sluggish turning or intermittent clicks found in aged factory units. The addition of highly conductive copper bushings paired with sealed housing designs ensures the motor continues delivering full torque even after months of dusty field operations. By matching exact O.E.M. bolt patterns and shaft depths, mechanics bypass the guesswork and wiring complications that often accompany aftermarket generic replacements. This restoration piece reinstates confident cold starts and prevents unnecessary battery drain while preserving the original architecture of the Suzuki LT80 and Kawasaki KFX80/KSF80 platforms.