Yamaha IT200S Owner's & Service Manual, 1986 (P/N LIT-11626-05-15)

Yamaha’s factory Owner’s Manual and Service covers the 1986 IT200S, model code 1TY. Publication P/N LIT-11626-05-15, First Edition, October 1985, combines operating guidance with engine, chassis, and electrical repair procedures for this competition off-road motorcycle.

PDF Search, Bookmarks, and Diagram Detail

Navigation and small labels: PDF text search is not available. Embedded bookmarks cover the chapters and many service sections, although some entries open one page past the section’s beginning. Small wiring color codes and connector labels require zooming for comfortable reading.

The ZIP download contains one printable, 125-page English PDF. This total includes the original front matter, chapter dividers, warranty and noise-regulation pages, and two largely blank pages.

Engine, Chassis, and Electrical Service

The following selected service topics show the manual’s coverage rather than its complete contents. Other sections address cleaning, storage, and break-in after component replacement.

• Operation and maintenance: Controls, premix and transmission-oil requirements, pre-operation checks, starting, lubrication schedules, air-filter care, and routine cable, brake, chain, and steering adjustments.

• Top-end and induction repair: VM34SS Mikuni carburetor disassembly and float inspection, Y.E.I.S. checks, reed-valve inspection, muffler maintenance, and cylinder-head, cylinder, piston, and ring service.

• Clutch and bottom-end work: Clutch-pack inspection and mechanism adjustment, primary drive and kick-starter service, engine removal, crankcase separation, transmission inspection, crankshaft checks, and reassembly.

• Brakes and wheels: Front-disc caliper and master-cylinder repair, hydraulic bleeding, rear-drum inspection, wheel removal and installation, and sprocket, chain, axle, and rim checks.

• Suspension and steering: Front-fork disassembly, damper-rod and guide-bushing inspection, seal installation, steering-head bearing service, Monocross shock removal, and swingarm-linkage inspection.

• Electrical diagnosis: No-spark and weak-spark fault isolation, CDI magneto and ignition-coil tests, engine-stop-switch checks, lighting-output measurements, and regulator troubleshooting.

• Workshop references: Exploded assembly views, wiring and cable-routing diagrams, torque tables, capacities, wear limits, suspension data, and engine, drivetrain, brake, steering, and wheel troubleshooting charts.

Owners can use the operating and maintenance guidance; internal repair work is suited to experienced owners and working mechanics who can use precision measuring equipment and model-specific service tools.

Engine Inspection and Reassembly

The engine chapters provide step-by-step procedures for major service work, with measurement criteria for cylinder-head warpage, cylinder condition, piston clearance, ring gaps, and piston-pin and small-end condition. These criteria support decisions about worn parts before reassembly.

Carburetor coverage identifies standard and optional jets and their Yamaha part numbers. The Carburetor exploded view shows component relationships, while the Y.E.I.S. section addresses the air chamber, hose, and connections.

Internal drivetrain checks: The Clutch and Transmission and Shifter exploded views support inspection of plates, springs, push rod, gears, shift forks, guide bars, shift cam, shafts, bearings, and seals. Crankshaft removal, measurement, and installation are included; repair beyond the specified tolerances is referred to a Yamaha dealer.

Tools and assembly cautions: Named equipment includes the YU-01135 crankcase separator and YU-90058/YU-90060/YU-90063 crankshaft installer set. Rotor and clutch holding tools are also specified. The crankcase section warns that forcing uneven separation or striking gasket surfaces can damage the case halves and sealing faces, and calls for transmission-operation checks before the case screws are tightened.

Brake, Wheel, and Suspension Detail

The hydraulic front-disc section covers pad replacement, piston and seal service, master-cylinder inspection, disc checks, and fluid-handling precautions. Rear-brake coverage addresses shoes, drum condition, and the brake cam.

Wheel service includes spoke tension, rim runout, wheel-bearing inspection, and speedometer-drive engagement during installation. Wheel-bearing replacement is referred to a Yamaha dealer.

Fork and linkage work: The Front Fork exploded view accompanies oil replacement, spring options, oil-level and air-pressure data, and complete fork service. The manual identifies YM-33962/YM-01326 fork-cylinder tools and dedicated seal drivers. It warns that bottoming the inner tube during guide-bushing removal can damage the oil-lock piece.

Steering-head service includes bearing and race inspection. Swingarm coverage extends to relay arms, connecting rods, collars, bushings, bearings, seals, and lubrication points.

Electrical Fault Isolation

Ignition test charts distinguish spark-plug, stop-switch, source-coil, pickup-coil, ignition-coil, connection, and CDI-unit faults. Lighting diagnosis follows bulb and switch checks through magneto-output and lighting-coil tests to regulator assessment.

The Wiring Diagram supplies component references and wire color codes; the Cable Routing Diagram locates cables, hoses, and electrical leads. These references support fault tracing and reassembly. Electrical measurements use the specified YU-03112 Yamaha Pocket Tester.

Race-Tuning and Rear-Shock Limits

Detailed carburetor and suspension tuning is referred to the separate Race Preparation and Tuning Manual, which is not included.

The De Carbon Monocross section covers settings, handling, removal, spring removal, and installation, but not internal shock overhaul or nitrogen charging. Because its remote reservoir is pressurized, Yamaha prohibits disassembly of the cylinder, tank, hose fittings, and related fasteners and assigns disposal of a worn or damaged unit to a Yamaha dealer.

Yamaha identifies the IT200S as a competition-only machine, not a street-use model.

A Preview of Piston and Clutch Inspection Values

For top-end inspection, specified piston-to-cylinder clearance is 0.050–0.055 mm, with a 0.1 mm service limit. The measurement section distinguishes cylinder bore from piston outside diameter when assessing this clearance.

Clutch inspection includes a minimum spring free length of 34.0 mm. The manual pairs this specification with spring measurement and replacement criteria.