1985-1988 Yamaha YFM80 Badger 80 Service Repair Workshop Manual

This is the COMPLETE Service and Repair Manual for the 1985-1988 Yamaha YFM80 Badger 80 Service Repair Workshop Manual. It covers every single detail.

Yamaha YFM80 Badger 80 Service Repair Workshop Manual (1985-1988) VEHICLE/EQUIPMENT INTRODUCTION: The Yamaha Badger 80 introduced in the mid-1980s was one of the first youth-oriented all-terrain vehicles from a major Japanese manufacturer. Designed with young riders in mind, the Badger 80s 79cc two-stroke engine provided manageable power levels while teaching proper ATV operation on a machine that was mechanically simple and forgiving. The YFM80 became the go-to first ATV for a generation of young outdoor enthusiasts. Built around a compact steel tube chassis with a reliable centrifugal clutch automatic transmission, the Badger required no gear shifting allowing young riders to focus on steering and throttle control. The engine featured an oil injection system that eliminated pre-mixing of fuel and oil a major convenience factor for families. With three forward speeds automatic clutch engagement, and a simple pull-start mechanism, the Badger 80 was purpose-built as a learner vehicle. The model ran from 1985 through 1988 with only minor changes each production year including decal updates and small improvements to the carburetor settings. Yamahas reputation for reliability built into the YFM80 meant these machines endured years of use by young riders, and many continue operating today decades later. The Badger 80 holds a special place in ATV history as a safe well-engineered introductory quad that grew up an entire generation of riders. SERVICE & REPAIR SCOPE: - 79cc two-stroke engine piston ring cylinder bore inspection - Cylinder head removal and cylinder extraction - Carburetor cleaning pilot jet idle screw adjustment - Clutch shoe replacement and engagement spring service - Three-speed automatic transmission gear inspection - Pull starter rewind spring rope replacement - Front and rear drum brake shoe and cable adjustment - Front suspension A-arm bushing replacement - Steering stem bearing inspection and adjustment - Oil injection pump cable adjustment reservoir fill - Throttle cable routing and free play setting - Electrical CDI igniter coil and spark plug cap testing TECHNICAL SPECIFICATIONS: - Engine: 79cc air-cooled two-stroke single cylinder - Transmission: 3-speed automatic centrifugal clutch - Starter: Recoil pull start - Front Suspension: Independent wishbone - Rear Suspension: Swingarm with single shock - Front Brake: Mechanical drum - Rear Brake: Mechanical drum - Seat Height: 710 mm - Dry Weight: 77 kg DIAGNOSTIC INFORMATION: - Compression test procedure for two-stroke engine - Spark plug heat range and gap specifications - Carburetor pilot screw setting from factory - Clutch engagement RPM check and shoe thickness measurement - Ignition spark verification with plug tester - Throttle cable adjustment range specifications ILLUSTRATIONS & DIAGRAMS INCLUDED: - Engine exploded component views - Transmission and clutch assembly diagrams - Wiring and CDI ignition system layout - Brake assembly and linkage illustrations - Suspension compon

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