YP100 Rocker Arm

Brand: Mortch Motor
Product Code: MIYP100-5017

Product Viewed: 271

Availability: Pre-Order 1-2 Weeks🔔

Weight: 0.10kg

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🔧 Yamaha 100 Rocker Arm

📦 Part Number: MIYP100-5017

⚙️ High-Performance Rocker Arm · 4-Stroke Scooter · Performance Upgrade

📍 Installation Position: Cylinder Head · Valve Train

✅ Increased Power · Smooth Operation · Durable · Direct Replacement

📋 Product Overview

This product is a Yamaha 100 Rocker Arm, part number MIYP100-5017. It is a high-performance replacement rocker arm designed for 4-stroke scooter engines — one of the most cost-effective ways to achieve real performance tuning.

The rocker arm is a key component in the valve train, responsible for converting the camshaft's rotational motion into reciprocating motion to open and close the intake and exhaust valves. 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.

✅ Quality Assurance: Manufactured from high-quality materials. Rocker arm shaft bore, contact surface profile, and mounting dimensions match OEM parts for a perfect fit and reliable operation.

📐 Specifications

🔖 Part Number: MIYP100-5017

🏷️ Product Name: Rocker Arm

🔧 Displacement: 100cc 4-Stroke

🧪 Material: High-Strength Alloy Steel

🔩 Surface Treatment: Hardened

📍 Installation: Cylinder Head · Valve Train

🏍️ Compatible Models & Engines

This Rocker Arm (MIYP100-5017) is compatible with the following models and engines:

Yamaha JOG100 · 4-Stroke
Yamaha RS100 · 4-Stroke
GY6 100cc / 125cc 4-Stroke Engines
Linhai LY149QMG Engine
Other scooters with GY6-style engines

📌 Fitment Note: This rocker arm is designed for GY6 series 4-stroke engines. Rocker arm specifications may vary across different model years or displacements. We recommend confirming your original rocker arm specifications before purchase. If your specific model is not listed, please contact us with your engine model for compatibility verification.

🚀 Performance Benefits

🏁 Increased Power · Smooth Operation

Optimized rocker arm design reduces friction loss in the valve train, improves valve opening precision and response — enhancing intake/exhaust efficiency for smoother power delivery and sharper throttle response.

🔧 Cost-Effective Upgrade

Rocker arm replacement is one of the most cost-effective ways to improve engine performance. This product enhances performance while maintaining smooth operation and durability — without affecting everyday drivability.

⚙️ Product Features

⚡ Increased Power: Optimized rocker geometry reduces friction, improves valve response, and enhances intake/exhaust efficiency.
🔄 Smooth Operation: Precision machining ensures accurate fit with the camshaft and valve stem — reducing noise and vibration.
🛡️ Durable: High-strength alloy steel construction with hardened contact surfaces for excellent wear resistance and long service life.
🔧 Direct Replacement: Mounting dimensions match OEM — directly replaces the old rocker arm without any modifications.
💰 Great Value: High-quality performance upgrade component offered at a competitive price.

✅ Typical Signs That Rocker Arm Replacement Is Needed:
• Noticeable valve tapping noise ("tick-tick") that persists even after valve adjustment.
• Power loss — poor acceleration.
• Visual inspection reveals wear grooves or pitting on the rocker contact surface.
• Worn rocker arm shaft bore causing unstable valve clearance.
• During engine overhaul, worn rocker arms should be inspected and replaced as needed.
Replacing worn rocker arms promptly restores engine power, eliminates noise, and enhances the riding experience.

✅ Installation Tips:
1. Remove the cylinder head cover and mark the positions of the rocker arms and shaft.
2. Remove the old rocker arms and inspect the rocker shaft for wear — replace if necessary.
3. Apply a small amount of engine oil to the shaft bore and contact surface before installation.
4. Install the new rocker arms and shaft in the original order.
5. After installation, adjust valve clearance to OEM specifications.
6. Start the engine and check for unusual noises — recheck valve clearance after warming up.
Professional installation by a qualified technician is recommended. Improper valve clearance adjustment may cause valve damage or power loss.

⚠️ Important Notice: This product is a Yamaha 100 Rocker Arm, part number MIYP100-5017. Suitable for 100cc 4-stroke GY6 series engines. Rocker arm specifications may vary across different model years or displacements. We recommend confirming your original rocker arm specifications before purchase. Images are for reference only; actual product may vary.

🔧 Compatibility Notice

Please verify that this part fits your specific vehicle model and year. Many vehicles share similar names but use different components depending on year or market region.
We strongly recommend cross-checking with your vehicle's owner's manual or contacting us for confirmation before placing your order.

📄 Product Disclaimer

Product images, measurements, and descriptions are for reference only. Slight variations in color or appearance may occur due to manufacturing batches or photography lighting—functional specifications remain identical to the ordered part.
Professional installation is mandatory. Mortch Motor assumes no liability for damages, injuries, or losses resulting from improper installation, misuse, unauthorized modification, or abnormal operation.

💰 Import Duties & Taxes

All listed prices EXCLUDE shipping costs, import duties, taxes, and customs clearance fees. These charges (if applicable) are determined and collected by your local customs authority and are solely the buyer's responsibility.
In case of return due to unpaid duties/taxes or refusal to clear customs, the buyer shall bear the original shipping cost, return shipping fees, and any associated administrative charges deducted from the refund.

📌 Order Confirmation: By completing your purchase, you acknowledge that you have read, understood, and agreed to all terms above. For any questions, please contact our support team prior to ordering.