YAMAHA 4ST-15512-00-00 Starter Idle Idler Reduction Gear

( Manufacturer Part Number: 4ST-15512-00-00 ), ( Power Rating: Oem ), ( Number Of Teeth: More Than 7 ), ( Type: Starter Gear ), ( Machine Type: Off-road Motorcycle ), ( Voltage: 12 V ), ( Features: Clockwise Rotation ), ( Country/region Of Manufacture: Japan )

Review YAMAHA Starter Idle Idler Reduction Gear Oem fits TTR90E 2003–2007

Introducing the Yamaha 4ST-15512-00-00 TTR90E Starter Idler Reduction Gear, a crucial component designed to enhance the performance and longevity of your Yamaha TTR90E ATV. This idler reduction gear is specifically engineered for use on TTR90E models produced between 2003 and 2007.

The idler reduction gear is a crucial part of the drive system in your ATV. It is responsible for reducing the drive belt's rotation speed, ensuring a smooth and efficient power transmission from the engine to the wheels. In the case of the Yamaha TTR90E Starter Idler Reduction Gear, it is meticulously crafted using high-quality materials to deliver optimal performance and durability.

This idler reduction gear features a robust and durable design, with hardened steel gears that can withstand the rigors of off-road riding. The precision-machined gears ensure a perfect fit and seamless operation, while the hardened steel bearings provide smooth rotation and minimize wear and tear.

One of the primary benefits of the Yamaha 4ST-15512-00-00 TTR90E Starter Idler Reduction Gear is its ability to help reduce starter motor wear. By reducing the idler pulley's rotation speed, the starter motor does not need to work as hard when cranking the engine, which in turn helps to extend the life of the starter motor.

Installation of the Yamaha 4ST-15512-00-00 TTR90E Starter Idler Reduction Gear is straightforward and can be completed with basic hand tools. The kit includes the new idler reduction gear, as well as any necessary hardware for installation, making it a complete solution for your ATV maintenance needs.

In summary, the Yamaha 4ST-15512-00-00 TTR90E Starter Idler Reduction Gear is an essential upgrade for your Yamaha TTR90E ATV. It delivers improved performance, enhanced durability, and extended starter motor life, making it a smart investment for any off-road enthusiast.

The Yamaha TTR90E starter idle idler reduction gear is a part that can help address issues with difficult starting and idling in Yamaha TTR90E motorcycles manufactured between 2003 and 2007. Here are some potential pros and cons of buying this part:

1. Improved Starting: This part is specifically designed to help address starting issues. By reducing the load on the starter motor, it can make starting the motorcycle easier, even in cold weather conditions.

2. Better Idling: The idler reduction gear can also help improve idle stability, reducing engine vibration and improving overall engine performance.

3. OEM Part: This is an original equipment manufacturer (OEM) part, which means it is designed, manufactured, and tested by Yamaha to meet their exact specifications.

4. Wide Application: This part fits a wide range of Yamaha TTR90E models manufactured between 2003 and 2007.

5. Peace of Mind: By using an OEM part, you can have peace of mind knowing that you are using a high-quality part that is specifically designed for your motorcycle.

1. Cost: Replacing a part like the starter idle idler reduction gear can be a significant investment. The cost of this part may be higher than some aftermarket alternatives.

2. Installation: Installing the part may require some mechanical knowledge and tools. If you are not comfortable with the installation process, it may be best to have a professional mechanic do it for you.

3. Availability: Depending on your location, availability of this part may be limited. It may be more difficult to find in some areas compared to aftermarket alternatives.

The Yamaha TTR90E starter idle idler reduction gear can be a valuable investment for those experiencing starting and idling issues with their motorcycle. While the cost may be higher than some aftermarket alternatives, using an OEM part can provide peace of mind and improved performance. If you have the mechanical knowledge and tools to install the part yourself, or if you are willing to pay for professional installation, this part can be a worthwhile investment.

If you are experiencing starting or idling issues with your Yamaha TTR90E motorcycle and have confirmed that the starter idle idler reduction gear is the cause, then replacing the part with an OEM Yamaha TTR90E starter idle idler reduction gear is recommended. This part is specifically designed for your motorcycle and can provide improved starting and idling performance, as well as peace of mind knowing that you are using a high-quality part. If you are unsure about the installation process, it may be best to have a professional mechanic do it for you.

Details:

With its OEM part number and compatibility with model years 2003 -2007, this reduction gear is a reliable choice for maintaining your bikes performance functionality. Manufactured by Yamaha in Japan, this starter gear has more than 7 teeth and operates on a 12V voltage system. It features clockwise rotation and is an essential component for ensuring smooth reliable starting of your Yamaha TTR90E motorcycle. The Yamaha TTR90E Starter Idle Idler Reduction Gear OEM 03-07 is a high-quality replacement part designed specifically for off-road motorcycles.

part #: 4st155120000 price

• $38.14

specifications scostarters:

• for models: Ttr90e
• for makes: Yamaha
• for years: 2003-2007
• mpn: 4st-15512-00-00
• power rating: Oem
• number of teeth: More Than 7
• type: Starter Gear
• machine type: Off-road Motorcycle
• voltage: 12 V
• features: Clockwise Rotation
• country/region of manufacture: Japan

payments scostarters:

• credit card: Discover
• wallet: Paypal
• other

returns scostarters:

• policy: No Returns

offer scostarters:

• sold: 0
• availability: In Stock
• options: Ship-to-home
• quantity: 1
• started: July 12, 2025

shipping scostarters:

• class: Standard
• type: Fixed
• cost: $4.00
• carrier: USPS
• service: USPS Ground Advantage
• transit: 4-10 Days

seller scostarters:

• # reviews: 957
• rating: 100.0%
• city: Lutz, Florida

general scostarters:

• Motorcycle Scooter Parts Accessories > Electrical Ignition Components > Starter Motors
• condition: Used

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