Gates 78G3640 Automatic Continuously Variable Transmission (CVT) Belt - Drive Belt

Gates G-Force CVT Belt 78G3640 Overview

The Gates G-Force CVT Belt 78G3640 is a Power Sport CVT belt built for automatic continuously variable transmissions in smaller-displacement vehicles under 800cc. It uses an aramid cord, chloroprene belt material, and a notched construction to support consistent belt tracking in demanding riding and work conditions.

For owners searching for a Gates CVT belt for Yamaha-style powersport applications, the 78G3640 is part of the G-Force WorkHorse line and is engineered around OE performance expectations. It is a direct replacement option for select CVT systems that call for a 20 mm top width and 946 mm outside circumference.

Key Features

• Gates G-Force WorkHorse CVT belt for power sport automatic transmissions
• Part number 78G3640 for accurate ordering and cross-reference lookup
• 20 mm top width and 946 mm outside circumference
• Aramid cord material for strength and belt stability
• Chloroprene belt material with notched construction
• Black finish with fabric bottom
• OE performance rating

Product Details

The Gates G-Force WorkHorse line focuses on CVT belt service in vehicles that see hard use on trails, job sites, and mixed terrain. This belt uses a 28-degree angle, RVS-R section designation, and a notched profile to help maintain proper engagement in the transmission. If you are replacing a worn CVT belt on a Yamaha or another select powersport application, 78G3640 provides the dimensional match needed for the correct CVT setup. This part cross-references Yamaha OEM numbers 3FA-17641-00 and 3FA-17641-00-00 for the same application.

Common Problems This Belt Can Address

• Slipping or inconsistent CVT engagement
• Loss of drive response under load
• Noise caused by a worn or glazed belt
• Reduced belt tracking from age or heat cycling
• Service replacement for a stretched or damaged CVT belt

Installation Notes and Tips

Verify the required top width, outside circumference, and section designation before installation. Confirm the transmission calls for a 20 mm x 946 mm belt with an RVS-R profile, and inspect the clutch faces and pulleys for wear before fitting the new belt. For fitment-based searches, this Gates CVT belt 78G3640 is commonly referenced for Yamaha powersport CVT applications and other select small-engine models that use the same specification.

Quality Assurance

Gates manufactures the G-Force CVT Belt line to OE performance standards for powersport transmission service. The 78G3640 is built with aramid reinforcement and a notched design to support dependable operation in demanding CVT applications.