1984 Yamaha ET250 / Enticer 250 Snowmobile Service Manual

Wiring diagrams, specifications, and repair sequences for your 1984 Yamaha ET250 & Enticer 250 snowmobiles. Get detailed maintenance and troubleshooting procedures for engine, power train, and chassis systems. Publication part number B8V-21771-00.

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Document Details

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Document Number / Seller:
25724 / Joseph Gonzalez
File Size:
16.91 MB
File Type:
PDF
Language:
English
Pages:
199
Printable:
Yes
Category:
Snowmobile
Last updated / verified
Jan 1, 2026

Models Covered & Key Technical Specifications

Yamaha ET250 / Enticer 250 (1984) (B8V-21771-00) – 1984 Tactical Repository for Technical Procedures | Suite

  • Nominal Installation Footprint: 381 mm width for the drive track establishes the spatial requirements.
  • Prescribed Maximum Resolution: For optimal engine function, 11 mm defines the spark plug gap measurement.
  • System Twist Specifications: The primary drive V-belt has a width of 31.6 mm, serving as a crucial component.
  • Technical Deviation Limits: The brake disc pad wear limit is 1.0 mm to ensure safety functionality.
  • Standard Operating Temps: The engine operates within a normal range, with specific values detailed for various conditions.
  • Defined Gross Dimensions: The suspension travel reaches up to 120 mm for the front and 80 mm for the rear.

Professional Workshop Service Manual & Technical Specifications

Precision Maintenance Field Manual: Snowmobile Yamaha ET250 & Enticer 250 (1984) Snowmobile Service Manual: Comprehensive Maintenance, Repair, and Parts Guide Powertrain-Manual

Reference-Category: Snowmobile / Powertrain Logic // Component-Focus: Engine, Chassis, Electrical, and Drive System // Specification-Class: Technical Data and Procedures.

Repair information is provided for the Yamaha ET250 and Enticer 250 snowmobiles. The document includes coverage of engine overhaul, power train components, chassis adjustments, and electrical system diagnostics. Rigorous maintenance procedures are outlined to ensure optimal performance and longevity.

Engine Systems

This manual meticulously documents engine systems, including detailed procedures for disassembly, inspection, and repair of critical components such as the cylinder head, piston, crankshaft, and oil pump. It provides essential information for maintaining the heart of your snowmobile.

Power Train Procedures

Power train procedures are extensively covered, detailing the removal, inspection, and assembly of the primary and secondary sheaves, chain housing, and drive components. Understanding these procedures is key to efficient power transfer.

Chassis and Suspension

Chassis and suspension systems receive thorough attention, with sections dedicated to ski and front suspension adjustments, steering mechanisms, and oil tank inspections. Proper chassis setup is vital for stability and control.

Electrical Diagnostics

Electrical diagnostics are clearly explained, covering ignition system troubleshooting, lighting system checks, and various switch tests. This ensures all electrical components function as intended.

Technical documentation covers a wide range of systems and procedures, offering a complete overview of maintenance and repair tasks. The document includes coverage of all major components and systems.

This manual documents torque specifications for critical engine and chassis components to ensure proper thermal expansion compensation.

Service sections detail the complete maintenance, repair, and parts guide for your snowmobile.

Metric Value Architecture
Engine Type Two-stroke, 5-port Logic
Displacement 27.9 cm³ (1.70 cu.in) Parameters
Primary Drive Ratio 3.5 : 1 ~ 1 : 1 Configuration
Track Width 381 mm (15 in) Framework
Track Length on Ground 1,330 mm (52.4 in) Baseline
Front Suspension Type Leaf spring, oil damper Requirements
Ignition System C.D.I. Baseline
Voltage Regulator TR12-50/SHINDENGEN Parameters

Specifications are presented in a clear and organized manner, including general specifications and maintenance-specific data for the engine and its components.

FAQ

Determine the **specific** torque specifications for the engine mounting bolts. keyboard_arrow_down

30 N·m (3.0 m·kg, 22 ft-lb) is the specified torque for the engine mounting bolts (front) and 30 N·m (3.0 m·kg, 22 ft-lb) for the engine mounting nuts (rear).

What **designated** safety precautions should be followed during track tension adjustment? keyboard_arrow_down

WARNING: Broken track, track fittings, or debris dangerous to an operator or bystanders. Observe the following precautions: Do not allow anyone to stand directly behind the snowmobile when starting forward. When the engine is running and the track is engaged with the snowmobile on its side, do not allow anyone to stand behind or on the track side of the snowmobile. The operator must stay on the seat (near the machine front).

Check the **critical** lubrication requirements for the drive chain housing. keyboard_arrow_down

Gear oil API GL-3 or SAE #75 ~ #80 is recommended for the drive chain housing. The oil capacity is 0.3 L (0.26 Imp qt, 0.32 US qt).

What does the **required** testing parameters for the ignition coil resistance indicate? keyboard_arrow_down

Primary Coil Resistance: 0.12Ω ± 10% at 20°C (68°F) [TOYO DENSO] and 0.15Ω ± 10% at 20°C (68°F) [HITACHI]. Secondary Coil Resistance: 4.0 kΩ ± 20% at 20°C (68°F) [TOYO DENSO] and 3.5 kΩ ± 20% at 20°C (68°F) [HITACHI].

Reference the **specified** diagnostic procedures for the lighting system. keyboard_arrow_down

Lighting Voltage: 11.8V at 3,000 r/min at 80°C (176°F) indicates the proper output for the lighting system. If other than specified, replace the lighting coil.

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Reviews (5)

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This manual is a must-have for anyone owning a Yamaha snowmobile. The detailed sections and easy navigation made my maintenance tasks a breeze!
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I was impressed by the smooth download process. The support team was quick to respond to my questions, making the whole experience seamless!
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This manual covers everything you need to know about maintaining your snowmobile. The tips on seasonal preparation are especially valuable.
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The layout and diagrams in this manual are fantastic! It's perfect for both beginners and experienced mechanics. Highly recommended!
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The download link was sent promptly, and the customer service was incredibly helpful. This manual has saved me a lot of time!