YP100 Gear Starter Idle

⚙️ Yamaha 100 Starter Reduction Double Gear

📦 Part Number: MIYP100-5051

⚙️ Taller Double Gear · Top Speed Upgrade · Pre-Assembled

📍 Installation Position: Final Drive Box · Countershaft

✅ Taller Gear Ratio · Higher Top Speed · Pre-Assembled · Great Value

This product is a Yamaha 100 Starter Reduction Double Gear (Taller Double Gear), part number MIYP100-5051. It is a high-performance replacement double gear designed for JOG100 and GY6 series 4-stroke engine final drive systems — a cost-effective way to increase top speed.

The starter reduction double gear is a key gear component in the final drive gearbox. Installing a taller (higher tooth count) double gear reduces the overall reduction factor of the gearbox. If the engine is powerful enough to pull the taller gears, this modification will raise top speed. Unlike common gear units, this one comes pre-assembled and is available at an unbeatable price. Simply replace the old gear unit with the new one — and that's it!

• 🚀 Higher Top Speed: Taller gear ratio reduces final reduction — effectively raises top speed when engine power is sufficient.
• 🔧 Pre-Assembled: Gear comes pre-assembled — ready for direct installation without special tools.
• 🧪 High-Strength Material: Premium alloy steel construction with precision machining and heat treatment for durability and wear resistance.
• 💰 Great Value: High-quality gear at an unbeatable price — an ideal choice for drivetrain upgrades.
• 🔄 Simple Installation: Simply replace the old gear unit with the new one — no complex tools or specialized skills required.

✅ Upgrade Tips:
• This product is designed for riders seeking higher top speed. For best results, pair with power upgrades (big bore kits, transmission tuning).
• On stock engines, low-end acceleration may be slightly reduced, but mid-range and top-end speed will see noticeable improvement.
• Installation is simple — just remove the old gear unit and install the new one (pre-assembled) — no pressing required!
This is one of the simplest, most cost-effective drivetrain upgrades for boosting top speed.

✅ Installation Tips:
1. Remove the rear wheel and final drive gearbox cover.
2. Remove the old double gear unit.
3. Clean the final drive gearbox interior and inspect the mounting bore.
4. Install the new double gear unit (pre-assembled) directly into position.
5. Install the retaining plate and mounting bolts to OEM specifications.
6. Refill with the correct amount of gear oil to the specified level.
The pre-assembled design makes installation very simple — however, if you're not familiar with drivetrain work, professional installation is still recommended.

⚠️ Important Notice: This product is a Yamaha 100 Starter Reduction Double Gear, part number MIYP100-5051. This is a taller-ratio double gear that reduces the final reduction ratio — raising top speed when engine power is sufficient. Before installation, please confirm that your final drive box mounting specifications match this unit. This product comes pre-assembled and is ready for direct installation. Images are for reference only; actual product may vary.