Product Description
Restore your motorcycle’s ignition reliability with the SILMAN One-Way Sprag Clutch Assembly. This critical component acts as the bridge between your starter motor and the engine, allowing the motor to crank the crankshaft during startup and disengaging immediately once the engine fires to protect the starter from back-rotation.
Commonly referred to as the “Self-Start Gear,” this assembly is engineered using high-tensile alloy steel to handle the heavy torque loads of the 6500-series and J-series predecessor UCE engines. It is a direct-fit replacement for OEM Part No. 592593/A, designed to eliminate the loud metallic grinding or “clunking” noises caused by worn-out sprag bearings.
Key Features:
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Precision One-Way Bearing: High-grade sprag rollers ensure instant engagement without slippage, even in cold-start conditions.
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Heavy-Duty Construction: Built with wear-resistant steel gears and reinforced cages to withstand engine kick-back and high-compression stress.
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Direct OEM Fit: Fully compatible with factory mounting points in the left-hand primary case; no modifications required.
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Silent & Smooth Operation: Reduces the mechanical chatter and “free-spinning” starter motor issues typical of failing factory units.
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Comprehensive Compatibility: Designed for all electric-start UCE (Unit Construction Engine) models including Classic, Standard, Electra, and Thunderbird series.
Specifications:
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Brand: SILMAN
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Compatible Part No: 592593/A, 570153
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Machine Type: Street Motorcycle (UCE Platform)
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Material: Hardened Alloy Steel / Mild Steel (MS)
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Fitment Type: Direct Replacement











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