1991–1993 Yamaha Enticer II 570 Snowmobile OEM Service Manual

• 442-page PDF compilation: 218 pages of R-series factory service content (PDF pages 2-219), 222 pages of T-series factory service content (pages 221-442), and two reseller cover sheets (pages 1 and 220).
• Exact model and starting frame/engine serial coverage: EX570R at 88R-000101, EX570ER at 88S-000101, EX570T at 8AV-000101, EX570ET at 8AW-000101, EX570STT at 89L-000101, and EX570SXT at 8AY-000101. The included factory identification pages do not list EX570S or EX570ES.
• Engine and cooling repair: Covers engine removal and remounting, crankcase and crankshaft service, cylinder-head, cylinder, piston, ring, and bearing inspection, oil-pump stroke adjustment and air bleeding, water-pump and thermostatic-valve service, cooling-system bleeding, and recoil-starter overhaul.
• Primary and secondary clutch work: Details sheave removal, disassembly, inspection, assembly, and installation; V-belt service; sheave distance, offset, and free-play adjustment; drive-chain housing and jackshaft repair; disc-brake overhaul; and model-specific clutch and gearing setup.
• Steering, suspension, and track procedures: Includes steering-column and linkage service, ski and runner inspection, front-suspension removal and installation, slide-rail suspension disassembly, front-axle and track work, track tension and alignment, and chassis lubrication points.
• Fuel-system and tuning coverage: Provides separate VM38 and EX570SX TM38 carburetor sections, fuel-level adjustment, fuel-pump testing, EX570SX carburetor synchronization, T.O.R.S. checks, and factory charts for carburetor, clutch, gearing, suspension, and high-altitude tuning.
• Electrical diagnosis by configuration: Covers electric-start and charging systems for the electric models, plus ignition, lighting, signal and warning circuits, grip and thumb warmers, component tests, circuit diagrams, and fault-isolation charts. The R-series section includes full EX570R and EX570ER wiring diagrams; the T-series section does not include the three full wiring sheets listed after its cable-routing chapter.

Both factory-manual sections address the liquid-cooled, twin-cylinder, piston-port two-stroke EX570 platform with Yamaha Autolube, automatic V-belt drive, chain secondary reduction, and CDI ignition. The material is suited to professional technicians and experienced owners with a properly equipped snowmobile workshop: routine inspection procedures are separated from major service work, while engine, clutch, and electrical repair assumes familiarity with precision measurement, spring-loaded clutch assemblies, and diagnostic meters.

Model-Specific Service Information

The R-series material separates the recoil-start EX570R from the electric-and-recoil EX570ER, with dedicated battery, fuse, starter-motor, rectifier, and charging-system coverage for the ER. The T-series section distinguishes the standard, electric-start, ST, and SX configurations throughout its specification tables. EX570SX receives its own TM38 carburetor removal, disassembly, synchronization, ignition/T.O.R.S., suspension, gearing, and high-altitude setup information, while EX570T, EX570ET, and EX570STT use the VM38-based carburetor procedures.

The specification chapters organize component-specific torque tables, approved lubricants and capacities, inspection limits, wear and clearance data, clutch spring and weight information, sheave settings, gearing charts, track and suspension measurements, carburetor jetting, and electrical continuity and resistance checks. These are repair-reference tables tied to the assemblies in each chapter rather than isolated tune-up figures.

Factory Tools, Diagrams, and Troubleshooting

The special-tool listings identify the Fuel Level Gauge P/N 90890-01312 / YM-01312-A, Cooling System Tester P/N 90890-01325 / YS-22460-01, Primary Sheave Holder P/N 90890-01701 / YS-01880, Clutch Spider Separator P/N 90890-01711 / YS-28890-B, and Pocket Tester P/N 90890-03112 / YU-03112, among other regional tool-number pairs.

Useful visual references include primary-sheave and V-belt exploded views, secondary-sheave section views, drive-chain housing and jackshaft exploded views, coolant-flow and cooling-line diagrams, starter-motor exploded views, and model-specific cable-routing drawings. Electrical chapters pair starting, charging, ignition, lighting, signal, and warmer-system schematics with symptom-based troubleshooting charts and component test specifications.

Important Repair Cautions and Scope

The clutch chapters flag two easy ways to damage expensive parts: locking compound must be kept off the primary-sheave bushings, and inadequate support during high-torque spider service can crack the sheaves or spider. On electric-start models, the charging-system material warns that disconnecting the battery while the generator is operating can damage the rectifier and regulator.

The PDF supplies complete full-machine wiring sheets only for EX570R and EX570ER. Its T-series table of contents names EX570/EX570SX, EX570E, and EX570ST wiring diagrams, but the scan ends at internal page 9-23 after the cable-routing drawings; those final sheets are not present. Chapter 8 still contains individual circuit diagrams and troubleshooting coverage for the T-series electrical systems.

Clutch spring loads, a raised and rotating track, hot pressurized coolant, fuel, and battery electrolyte require proper stands, isolation, protective equipment, and workshop training before major repair work is attempted.