Yamaha Tri-Moto 200 & 225 Factory Service Manual (P/N LIT-11616-03-82)

Use the base manual for shared service procedures and the applicable supplements for changes to the drivetrain, chassis, electrical system, and specifications.

Missing original pages: The base manual omits printed pages 3-4 and 3-44; the DRN supplement omits pages 44, 47, 57, and 62; and the DRS supplement omits page 7. These gaps interrupt engine-removal, clutch-cover, electrical, and fork-assembly procedures.

PDF Access, Bookmarks, and Diagram Detail

Search and section access: Text search is available only on the opening navigation guide, not throughout the manual pages. Embedded bookmarks reach the main sections, but several ERN supplement subentries return to the first page. Small wiring-diagram labels require zooming.

One printable 380-page PDF, including the one-page navigation guide and the publications listed above.

Engine Overhaul, Shaft Drive, and Electrical Service

These selected repair topics are part of a wider reference that also includes fuel-cock inspection and headlight-beam adjustment.

• Engine overhaul: Step-by-step cylinder-head, piston, crankshaft, and oil-pump inspection and repair, with balancer-shaft assembly and recoil-starter service.

• Routine maintenance: Inspection and lubrication charts, valve and cam-chain adjustment, clutch adjustment, ignition-timing checks, and compression testing.

• Carburetion: Carburetor disassembly, jet and float-valve inspection, fuel-level adjustment, and a sectional view of the fuel-metering components.

• Shaft drive and reverse: Middle-gear disassembly, shim selection, backlash measurement, final-drive service, and variant-specific reverse-gear procedures.

• Brakes and suspension: Front drum and rear disc brake service, wheel-bearing replacement, steering-head inspection, and the applicable fork and rear-suspension procedures.

• Electrical diagnosis: Starter-motor repair, starting-circuit cut-off tests, CDI ignition checks, charging and lighting diagnosis, and neutral/reverse indicator troubleshooting.

Suited to mechanics familiar with engine teardown and electrical testing, with access to the special tools and measuring equipment specified in the manual.

Engine Inspection and Reassembly References

The engine overhaul chapter covers valve-guide replacement, valve-seat cutting and lapping, cylinder and piston inspection, and crankshaft/connecting-rod checks. Primary and secondary clutch sections distinguish shoe wear, friction-plate thickness, plate warpage, and spring inspection.

Transmission inspection covers shift forks, guide bars, shift-cam grooves, shaft runout, and gear engagement. Balancer assembly illustrations identify the alignment marks on the buffer boss, drive gear, and driven gear.

The appendices bring together component-specific torque tables, wear limits, exploded assembly views, and lubrication diagrams. These references support inspection and reassembly decisions during bench work.

Carburetor and Preventive Maintenance Coverage

The carburetor sectional view identifies the throttle valve, jet needle, needle jet, float valve, and main jet. Inspection instructions address contamination, needle wear, float condition, and fuel-level checking.

The air-cleaner and crankcase-ventilation layout complements the maintenance charts. Compression-test guidance explains how the results can help distinguish piston-ring leakage from other sealing problems.

Middle Gears, Reverse Drive, and Final-Drive Setup

The ERN and DRN supplements describe the reverse-drive dog clutch, forward and reverse gears, and their shim arrangements. DRN coverage also includes middle-driven-shaft positioning and thrust-play measurement.

Variant-specific measurement illustrations help match the correct checking point and tool to the assembly being serviced. The shaft-drive troubleshooting chart relates rumble, whine, jerky movement, and loss of drive to possible bearing, gear, or coupling faults.

The factory cautions explain that insufficient gear lash can damage gear teeth. Middle-gear adjustment coverage also identifies the collapsible collar as a component that can be damaged by excessive tightening.

Tool references include Universal Joint Holder YM-04062, attachment YM-33291, and Dial Indicator YU-03097.

Chassis Differences and Suspension Service

The 200-series specifications describe a rigid rear layout; the 225DX/DR material covers Monocross rear suspension, swingarm bearings, and the rear shock absorber. The shock section includes removal, spring-preload adjustment, and leak inspection, with replacement of the complete shock absorber specified for damper leakage.

The DRS supplement supplies revised front-fork procedures and specifications. Its tool list identifies T-handle YM-013