1983-1986 Yamaha YTM200EK / YTM225DXK Service Manual

Yamaha YTM200EK and YTM225DXK Technical Scope

• Covers 1983–1985 Yamaha YTM200K-N and 1983–1986 YTM225K-S Tri-Moto all-terrain vehicles, including shaft-drive variants and air-cooled 4-stroke engine configurations
• Official Yamaha service publication P/N LIT-11616-05-33, first edition September 1985
• Contains 47 detailed exploded-view diagrams and 39 technical torque specification tables for engine, chassis, and drivetrain components
• Accessible from your device as soon as the order is placed
• OCR text layer lets you jump to a torque spec by keyword
• Re-download the file any time, no expiration
• Suitable for printing individual sections for shop-floor use
• This 1st edition September 1985 manual provides the factory-authorized procedures for all 1983–1986 YTM200 and YTM225 Tri-Moto models manufactured by Yamaha Motor Corporation

Mechanical Coverage Overview

This factory publication documents the full mechanical disassembly and reassembly process for the Yamaha Tri-Moto line. The content structure guides the user through complete engine overhauls, covering cylinder head, piston, crankshaft, and balancer shaft removal, alongside detailed transmission and secondary clutch maintenance. The technical chapters detail specific procedures for carburetor tuning, air cleaner system maintenance, and shaft-drive gear lash measurement to ensure long-term drivetrain reliability.

Specification and Reference Data

Technical data is presented throughout the document to support accurate mechanical work. Torque values are provided for every major assembly, such as the 50 Nm cylinder head bolt specification and 43 Nm drain plug torque. Reference values for electrical systems, including what an OEM service publication covers, include stator resistance ranges and battery maintenance requirements for the 12V charging system. Intake valve clearance for the Yamaha YTM200EK is listed at 0.05–0.09 mm in the engine specification table. Compression pressure for the engine is documented at 883 kPa under standard sea-level conditions. Exhaust valve clearance for the 1983–1986 YTM200EK and YTM225DXK is specified at 0.11–0.15 mm. All service data shown here is for reference only — qualified technicians and the original OEM documentation remain the authoritative source for any hands-on work. This official 100-page Yamaha OEM service manual covers the 1983–1986 YTM200EK and YTM225DXK, documenting engine, chassis, electrical, and carburetor specifications for the Tri-Moto off-road vehicle line.