1987 Yamaha YFM225T Moto 4 Owner's Manual (P/N LIT-11626-05-85)

This Yamaha factory owner's manual covers the YFM225T Moto 4. It is the 1st Edition, November 1986, identified as P/N LIT-11626-05-85.

The download contains a 118-page English PDF scan. The wiring diagram listed in the contents is missing from this file.

• Controls and operation: Pre-operation checks, engine break-in, high/low/reverse selection, and emergency rope starting with the decompression lever.

• Engine and final drive: Engine oil replacement, filter and strainer cleaning, cylinder-head oil-flow checks, final gear oil changes, and spark plug inspection.

• Intake and throttle: Foam air-filter servicing, idle-speed adjustment, throttle-lever free play, and guidance on carburetor work requiring specialist knowledge.

• Brakes and chassis: Front lining and rear pad inspection, brake and clutch adjustment, knuckle-shaft lubrication, shock preload adjustment, and wheel removal and installation.

• Electrical equipment: Auxiliary DC accessory connections, battery servicing, fuse replacement, circuit-breaker operation, headlight bulb replacement, and beam adjustment.

• Troubleshooting and reference: Fuel, compression, ignition and battery checks, an oil-temperature-light checking chart, periodic maintenance schedules, and torque reference tables.

This manual is written for owners learning to operate the ATV and performing preventive maintenance and minor repair work. Yamaha directs owners unfamiliar with servicing to a dealer or qualified mechanic.

Dual-Range Transmission and Operating Controls

The operating section distinguishes foot-operated gear changes from selection of high, low and reverse ranges. It explains the dual-range five-speed transmission and centrifugal automatic clutch, with separate coverage of cold starts, warm starts, choke use and the starting interlock.

Riding guidance explains the handling characteristics of rear wheels fixed to a common axle. Loading precautions address the front and rear carriers, storage box and trailer hitch, including restrictions when carrying cargo or towing.

Engine, Final Drive and Maintenance Limits

The specifications identify the air-cooled SOHC 2HT engine and shaft final drive. Oil-service illustrations identify the filter, strainer, compression spring and O-ring. The accompanying cylinder-head oil-flow check addresses the risk of engine seizure from inadequate lubrication after an oil change.

The Mikuni VM24SH carburetor section provides an idle-adjustment procedure. More involved carburetor settings and valve-clearance adjustment are referred to a Yamaha dealer or qualified mechanic. Internal engine and transmission repair procedures are outside this manual's scope.

Torque references distinguish a component table covering the spark plug, oil-service fasteners and wheel nuts from a general nut-and-bolt table. A torque wrench is required in addition to the owner's tool kit.

Brake and Suspension Adjustments

The rear brake procedure covers the pedal and hand-lever cables at the caliper, including a check for brake drag after adjustment. Front drum-brake illustrations identify the cable joint and lining wear indicator; rear disc-pad inspection is covered separately.

Suspension coverage explains spring-preload adjustment and identifies the knuckle-shaft grease points. Service of the nitrogen-charged De Carbon rear shock is referred to a Yamaha dealer.

Support the ATV securely during wheel and brake work, and follow the manual's engine-shutdown precautions for maintenance.

Auxiliary Power and Fault Isolation

For the 12V auxiliary DC terminal on the front bumper, the Max Amperage Chart relates accessory capacity to engine speed and headlight/taillight use. Together with the accessory-plug illustrations, it helps owners assess the connection and electrical load without overlooking battery discharge.

Battery illustrations show breather-pipe routing. Incorrect routing can discharge electrolyte onto the frame and cause structural and cosmetic damage. Rear-fender removal is also illustrated for access during battery and fuse servicing.

The Troubleshooting chart separates fuel, compression, ignition and battery checks for starting problems or loss of power, helping narrow down which system needs repair. The separate Oil temperature light checking method chart distinguishes warning-lamp and circuit faults from overheating.

File Format and Readability

The page total includes six preliminary pages, one maintenance-record page and two memo pages. These are already included in the 118 pages; no separate supplements are supplied.

The scan has no searchable text layer and no PDF bookmarks. Its printed contents provide section references. Text and reference charts are readable, with small chart labels clearer when enlarged.