YP100 Starter Clutch

⚡ Yamaha 100 Overrunning Clutch

📦 Part Number: MIYP100-5015

⚙️ Overrunning Clutch · 4-Stroke Scooter · Improved Torque

📍 Installation Position: Drivetrain · Crank Side

✅ Higher Torque · Stronger Acceleration · Easy Fit · Direct Replacement

This product is a Yamaha 100 Overrunning Clutch, part number MIYP100-5015. It is a high-performance replacement overrunning clutch (one-way clutch) designed for 4-stroke scooter drivetrains — one of the most cost-effective ways to achieve real performance tuning.

The overrunning clutch (also known as a one-way clutch or starter clutch) is a key component in the drivetrain, responsible for transferring crankshaft power to the starter mechanism during starting, and automatically disengaging once the engine is running. Working closely together with various 4-stroke scooter manufacturers, we have managed to increase engine performance and running smoothness. The result does not affect everyday drivability while still offering smooth running and durability. Its strongest point is that it provides higher torque which translates into better acceleration. Fitting is much easier and quicker than replacing the complete cylinder. The overrunning clutch can, of course, be used with original (restricted) engines.

• ⚡ Higher Torque Output: Optimized overrunning clutch design delivers greater torque transfer capability, significantly improving starting and acceleration performance.
• 🔄 Smooth & Durable: Enhances performance while maintaining smooth operation and durability — does not affect everyday drivability.
• 🔧 Easy Installation: No complex modifications required — direct replacement of the original part, much quicker than replacing the complete cylinder.
• 🛡️ Compatible with Stock Engines: Can be used with original (restricted) engines — one of the most cost-effective performance upgrades available.
• 🔩 Precision Machined: Gears are precision-cut with accurate tooth profiles for smooth engagement and low operating noise.

✅ Typical Signs That Overrunning Clutch Replacement Is Needed:
• Sharp metallic grinding or slipping noise during starting.
• Starter motor spins freely without engaging the crankshaft.
• Unusual noises or hesitation from the drivetrain during acceleration.
• Clutch slipping, causing rough power delivery.
Replacing a worn overrunning clutch promptly restores starting performance and acceleration response, enhancing the riding experience.

✅ Installation Tips:
1. Remove the transmission cover and take out the old overrunning clutch.
2. Clean the crankshaft mounting surface to remove oil and burrs.
3. When installing the new clutch, pay attention to the one-way rotation direction.
4. Tighten the retaining bolts to OEM torque specifications.
5. After installation, manually rotate the crankshaft to verify proper clutch operation.
Professional installation by a qualified technician is recommended. Improper installation may cause starter system failure or drivetrain damage.

⚠️ Important Notice: This product is a Yamaha 100 Overrunning Clutch, part number MIYP100-5015. Specifications: Main Shaft 15 Teeth, Gear O.D. 119mm, Gear 77 Teeth. Suitable for 4-stroke 100cc/125cc GY6 series engines. Tooth count and outer diameter may vary across different model years and versions. We recommend confirming your original clutch specifications before purchase. Images are for reference only; actual product may vary.