1-10 Fit 1990-2000 Yamaha RT100 Fuel On/Off Valve Gas Engine Tank Petcock Switch
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Item specifics
1-10 Fit 1990-2000 Yamaha RT100 Fuel On/Off Valve Gas Engine Tank Petcock Switch
Product Overview
The fuel petcock is the gateway between your Yamaha’s gas tank and the carburetor. When it fails — often due to aged rubber, corrosion, or a stuck internal plunger — you may experience fuel leaks, hard starting, erratic idle, or even an engine that won’t run at all. A faulty petcock can also leave you stranded if the reserve function no longer works. Replacing it with a reliable, purpose‑built unit restores proper fuel flow and peace of mind.
This aftermarket petcock is precision‑engineered to meet or exceed OEM specifications for the popular Yamaha RT100 and dozens of other two‑stroke and four‑stroke models. It features a durable aluminum alloy body that resists corrosion and vibration, plus three clearly marked positions — ON for normal riding, OFF to stop fuel flow when parked or trailering, and RESERVE to access the last 10‑15% of fuel in the tank. The 34 mm center‑to‑center mounting hole pattern and 6‑7 mm (1/4″) fuel line diameter ensure a direct bolt‑on fit on compatible Yamahas.
Whether you’re restoring a 1990 RT100, upgrading an older YZ, or simply replacing a worn part on your daily rider, this petcock offers a cost‑effective, high‑quality solution. Installation is straightforward with basic hand tools, and the included 3‑year warranty gives you extra confidence. Say goodbye to messy fuel leaks and unreliable fuel delivery — this valve is built to last.
Key Features & Benefits
Product Specifications
Vehicle Fitment & Compatibility
Yamaha
* List includes all confirmed Yamaha applications. If your model is not listed, please verify physical dimensions.
Installation Guide
Replacing the fuel petcock is a simple job that can be completed in about 20 minutes with basic hand tools. Difficulty: Easy. Tools needed: flathead screwdriver, 8 mm or 10 mm socket (depending on bike), pliers (to pinch fuel line), and a rag to catch any drips.
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Return Process
To return merchandise, please use one of the following methods:
Within 30 Days of Purchase
Please contact our Customer Service team to obtain a Pre-Paid Return Label within 30 days of your purchase. No postage is required for your shipment with this label. A return shipping charge will be deducted from your refund on returns of items that are not the result of a US85.com error.
Upon receiving, your return will be processed within 2-3 business days. You will receive a notification when your return has been processed.
After 30 Days of Purchase
If your purchase date is over 30 days and you are still not satisfied with your purchase, you will need to use your own shipping methods to return the item. US85 does not provide a pre-paid return label for returns over 60 days. We are unable to offer refunds on purchases over 30 days old.
Please allow approximately 2-3 business days for processing. You will receive a notification when your return has been processed.
Refund Process
For your safety, we will issue a refund to the card that was used to pay for your purchase. Normally it takes about 2-3 business days after we receive the package for your return to be processed. If you paid with store credit, that credit will be put back on your US85 account. There is no restocking fee applied to any returned goods. We will do our best to keep you informed throughout the process via email. If you have any questions please don’t hesitate to give us a call at (650) 267-4452