Universal Parts QMB139 CVT Cover Gasket - Long

QMB139 Long Case CVT Gasket

Protect your drive belt and clutch components from road grime and moisture with the Universal Parts CVT Cover Gasket. Specifically designed for "Long Case" 50cc and 80cc 4-stroke QMB139 engines, this gasket ensures a precise seal between the engine crankcase and the transmission cover. A fresh gasket is essential every time you open your CVT for maintenance to prevent debris from entering the housing, which can cause premature belt wear and clutch slippage.

Technical Performance Features

• Long Case Optimized: Measuring 17 inches in length, this gasket is the dedicated fit for larger 50cc scooters utilizing 12-inch or 13-inch rear wheels.
• 10-Bolt Precision Alignment: Features 10 accurately punched bolt holes to match factory mounting points, ensuring a wrinkle-free installation and a uniform seal.
• High-Compression Gasket Material: Manufactured from durable, oil-resistant composite paper that compresses slightly upon installation to fill minor surface imperfections in the metal casing.
• Debris & Moisture Barrier: Engineered to keep out dust, water, and road salt, preserving the life of your variator, rollers, and drive belt.

Comprehensive Fitment Guide

This gasket fits Long Case 139QMB-based 50cc / 80cc engines. If your engine code includes "QM" or "FM" and your cover is approximately 17" long, this is the correct part:

Technical Specifications

• Overall Length: 17 Inches
• Widest Point: 7 Inches
• Bolt Hole Count: 10
• Engine Compatibility: QMB139 / GY6 50cc (Long Case)

Mechanic's Note: This is for the Long Case engine only (usually found on scooters with 12" wheels). If your CVT cover is roughly 16 inches long, you need the "Short Case" version. Pro Tip: Never use RTV silicone on a CVT gasket; it makes future belt changes incredibly difficult. Check your CVT Drive Belt for cracks while the cover is off!

SKU: 151-286
MPN: 4882
Vendor: Universal Parts

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