1996–1999 Yamaha TDM850 Service Manual Set (P/N 4TX-AE1)

The 1996–1999 Yamaha TDM850 Service Manual Set combines the 4TX1 Service Manual (4TX-AE1) with the 4TX4 Supplementary Service Manual (4TX-AE3). The supplement provides revised specifications and selected service procedures alongside the main workshop manual.

• Engine repair: Engine removal, cylinder-head and valve service, crankshaft inspection, balancer installation, clutch repair, and transmission disassembly.

• Periodic maintenance: Valve-clearance adjustment and shim selection, compression testing, dry-sump oil service, and cooling-system checks.

• Carburetion and TPS: Carburetor disassembly, fuel-level adjustment, synchronization, and throttle position sensor inspection and tachometer-based adjustment.

• Brakes and chassis: Hydraulic brake bleeding, master-cylinder and caliper repair, fork-seal replacement, steering-head service, and swingarm inspection.

• Electrical troubleshooting: T.C.I. ignition, starting and charging tests, cooling-fan diagnosis, TPS self-diagnosis, and system-specific circuit diagrams.

• Supplement coverage: Revised clutch information, electric fuel-pump testing, fuel-sender and speed-sensor diagnosis, and combination-meter functions.

These publications were written primarily for Yamaha dealers and qualified mechanics and assume a working knowledge of motorcycle repair.

Engine Inspection and Internal Repair

Exploded assembly views and job charts accompany the removal and disassembly sections. Internal inspection covers piston and ring measurements, valve guides, camshaft clearances, and crankshaft bearing selection using identification markings and bearing color codes.

Separate procedures address the A.C. magneto and starter-wheel gear, oil-pump clearances, and balancer-shaft alignment. Transmission inspection includes shift forks, shift-cam grooves, gear engagement, and shaft runout.

Component-specific torque data include crankcase tightening sequences. The camshaft section warns that uneven loading of the cap bolts can damage the cylinder head, camshaft caps, or camshafts.

Clutch and gearing differences: The supplement supplies revised transmission ratios and clutch specifications. It also distinguishes the first and last friction plates from the remaining plates by material and appearance, helping identify the correct plate arrangement during clutch work.

Carburetor Service and Fuel-System Differences

The main manual’s carburetor disassembly and fuel-level procedures describe its BDST38 setup. For 4TX4, the supplement provides revised carburetor specifications and synchronization information.

Fuel-pump data distinguish the main manual’s vacuum-operated system from the supplement’s electric system. The added troubleshooting charts separate relay, pump, wiring, and ignitor checks, helping narrow a fuel-delivery fault before selecting replacement components.

TPS adjustment and diagnosis: The documentation distinguishes the tachometer-based adjustment mode from the TPS self-diagnosis display. Sensor resistance and harness continuity checks support fault isolation. The electrical procedures identify pocket tester 90890-03112.

Lubrication, Cooling, and Chassis Service

The dry-sump oil-service instructions distinguish routine oil changes, filter changes, and total engine capacity. Oil-level inspection includes the required warm-up and settling conditions.

Cooling-system coverage includes radiator-cap pressure testing, thermostat checks, and leak inspection. Water-pump removal and installation are documented, with Yamaha specifying replacement of the complete pump unit.

Fork service includes damper-rod inspection and seal installation, with fork-seal driver 90890-01367 and adapter 90890-01374 identified. Steering-head bearing checks, suspension linkage lubrication, and swingarm inspection complement the brake repair sections.

Brake hydraulics and the nitrogen-charged rear shock require the handling precautions described in the manual.

Wiring Diagrams and Electrical Fault Tracing

The electrical sections provide meter settings, test connections, and continuity charts for system diagnosis. Starter-motor inspection and ignition-timing checks are included.

Illustrations include lubrication diagrams, cable-routing drawings, the Electric Starting System circuit diagram, TPS Self Diagnosis charts, the Fuel Pump System circuit diagram, and separate full-sheet wiring diagrams for the two configurations. The supplement also documents fuel-gauge, hazard-circuit, and speed-sensor checks.

A Preview of Valve-Clearance and Idle Specifications

The following values are a small sample of the 4TX1 maintenance data in the main manual.

For cold-engine valve checks, intake clearance is 0.15–0.20 mm and exhaust clearance is 0.25–0.30 mm. Shim-selection charts relate the measured clearance to the replacement pad.

The warm-engine idle-speed check specifies 1,050–1,250 r/min. The accompanying procedures identify the tachometer requirements and provide separate synchronization and intake-vacuum data.

Text Search, Wiring Detail, and PDF Contents

Search and navigation: Body text is searchable, although cover lettering and some diagram labels are not. Embedded bookmarks provide chapter access, but several nested entries are inactive or lead only to the supplement’s contents page. Small labels in the full-sheet wiring diagrams are clear when enlarged.

One printable, English-language PDF contains 363 pages across two publications:

These counts already include six preliminary pages in the main manual and five in the supplement, including both covers. The main manual’s thirteen largely blank divider or layout pages are also included in the total.