1980–1985 Yamaha SS440, SS440D, SS440E, SS440H Snowmobile Service Manual Set (P/N LIT-12618-00)

This Yamaha SS440 service manual set combines the SS440D base manual with SS440E and SS440H supplements for the 1980–1985 snowmobiles. The supplements supply model-specific changes and are used alongside the base manual.

• Engine repair: Engine removal, crankcase separation, crankshaft and piston inspection, cylinder measurements, and reassembly torque sequences.

• Lubrication and cooling: Autolube pump checks, cable adjustment and bleeding, plus cooling-fan, fan-belt, and recoil-starter service.

• Carburetion: Keihin carburetor overhaul, symptom-based troubleshooting, intake reed-valve inspection, fuel-pump checks, and altitude-dependent main-jet charts.

• Clutch and chain drive: Primary and secondary sheave service, spring-setting charts, chain-housing overhaul, front-axle work, and V-belt shim information.

• Brakes and chassis: Floating disc brake service, slide rail suspension adjustment, drive-track replacement and alignment, steering linkage, and ski inspection.

• Electrical diagnosis: Ignition troubleshooting charts, coil tests, lighting-system checks, wiring diagrams, and wire and pipe routing diagrams.

Suited to mechanics familiar with two-stroke engine repair and clutch service, with access to the pullers and measuring tools specified in the procedures.

Engine Repair, Autolube and Cooling

The engine chapter covers bearing and oil-seal work, crankshaft runout and connecting-rod checks, piston-ring measurements, and cylinder inspection. Crankcase and cylinder-head assembly instructions include tightening sequences and component-specific torque values.

Autolube coverage includes pump-stroke checks, cable settings, and bleeding after service. The oil pump itself is treated as a precision assembly that must not be internally disassembled.

Cooling-fan service includes belt adjustment with shims and model-specific pulley fasteners. The recoil hand starter section covers the rope, return spring, and drive-pawl assembly.

Carburetor Diagnosis and Altitude Tuning

The troubleshooting tables connect hard starting, poor idle, high-speed power loss, and overflow with specific carburetor circuits and fuel-supply checks. Main jet setting charts provide temperature and altitude combinations for selecting the appropriate setup.

The air-silencer warning explains how operation or tuning without the box can create a lean mixture and severe engine damage. The SS440E supplement also addresses the reinforced silencer joint and its effect on balanced intake operation.

Sheaves, Chain Housing and Running Gear

The SS440H supplement adds revised primary-sheave procedures, slider and roller-bushing inspections, match-mark guidance, and V-belt shim information. Its left-hand-threaded spider uses Loctite #648; the removal notes explain the risk of cracking the sheaves or spider during improperly supported service.

Special-tool references include Clutch Spider Separator YS-28890-A and Clutch Separator Adaptor YS-34480. The supplement distinguishes this assembly from the earlier clutch procedures.

Secondary spring setting charts and sprocket ratio and chain link charts support clutch and gearing choices for different snow and riding conditions. Chain-housing and front-axle procedures address bearings, seals, sprocket positioning, and alignment.

Slide rail suspension sections explain stopper-band and rear-spring settings, shock inspection, and track alignment. Steering and ski coverage includes linkage adjustment, toe-out, wear plates, and leaf-spring inspection.

Always verify the snowmobile is fully secured and the engine is cool before inspecting these mechanical systems to prevent injury.

Electrical Fault Tracing and Routing Diagrams

Ignition troubleshooting charts address weak or missing spark and poor engine pickup through connection checks, spark-gap testing, and individual coil measurements. The supplements provide different ignition-system test data, helping mechanics select the correct reference before condemning a component.

C.D.I. diagnosis follows checks of the surrounding ignition system. Lighting coverage includes the source coil, voltage regulator, headlight adjustment, and oil caution switch circuit.

Illustrations include the Ignition System Circuit Diagram, Lighting System Circuit Diagram, Wiring Diagram, Wire and Pipe Routing Diagram, and separate oil-tank and fuel-tank piping diagrams.

A Preview of Oil-Pump and Sheave Inspection Data

As a small sample of the service specifications, the SS440D oil-pump section gives a minimum pump stroke of 0.20–0.25 mm for its checking and adjustment procedure.

The SS440H primary-sheave section specifies 0.1–0.35 mm standard clearance between the slider and spider, with a 1.0 mm wear limit. These measurements accompany slider inspection and replacement guidance.

PDF Search, Bookmarks and Included Manuals

Search and diagram detail: OCR text search is available through most of the file, with occasional recognition errors. The secondary-sheave assembly sheet on PDF p. 91 has no searchable text. Chapter and supplement bookmarks are included, although the “Keyword Search” entry has no destination. Small wiring labels are best read with zoom.

Supplied in English as one printable, 128-page PDF containing three publications:

The opening section index and both supplement contents sheets are already included in these page counts.