Yamaha TDM850 Service Manual Set | 1992–1993, 1996–1997 & 1999 (P/N LIT-11616-TD-85)

Use the E/EC supplement with the D/DC base manual for updated identification, specifications, and cable routing. Use the 1997 supplement with the 1996 base manual, and consult both for the work covered by the 1999 update.

The 1997 supplement identifies 5AR1 for Switzerland and Austria (CH, A). The full wiring diagram covers 4TX2, the other 1997 configuration.

PDF Files, Search, and Wiring Detail

Text search and navigation: The 1996, 1997, and 1999 PDFs have searchable service text. Search in the D/DC and E/EC file reaches only the outer cover. The early file and the 1996 manual have chapter bookmarks. The 1997 supplement has no bookmarks, and the usable section bookmarks in the 1999 supplement lead to its contents page.

Small connector labels and wire-color codes are easier to read at higher zoom. The early full wiring diagram is sideways on the page. In the 1996 manual, parts of the cable-routing drawing (PDF pp. 47–48) and one rear balancer holder illustration (PDF p. 171) are cut off. The accompanying text is readable.

The ZIP contains 751 pages across four printable PDFs. The first file combines the D/DC manual and E/EC supplement. The total includes the additional Yamaha cover, the publication covers, and blank and divider pages.

Engine Overhaul, Chassis Service, and Electrical Diagnosis

The list highlights selected workshop topics. The base manuals also cover steering-head adjustment and static wheel balancing.

• Engine overhaul: Step-by-step procedures cover engine removal, cylinder-head and camshaft work, valve and piston inspection, timing-chain and balancer indexing, oil pump service, and reassembly.

• Clutch and transmission: Clutch-pack inspection, transmission disassembly, and checks for gears and shift forks.

• Brakes and chassis: Brake disc inspection, master cylinder and caliper repair, hydraulic bleeding, front fork and seal service, and rear shock, relay arm, swingarm, and drive chain inspection.

• Cooling system: Radiator cap pressure testing, thermostatic valve checks, water pump service, and cooling-fan troubleshooting.

• Fuel and emissions: Carburetor synchronization and overhaul, float-chamber fuel-level checks, fuel pump testing, and California canister and emission hose inspection.

• Electrical troubleshooting: Switch continuity tests, ignition and starting fault isolation, charging tests, and lighting and signal diagnosis.

• Assembly references: Exploded views and job instruction charts accompany the procedures. Reference tables give torque values, fluid capacities, wear limits, adjustments, and electrical test values.

Yamaha wrote these manuals primarily for its dealers and qualified mechanics, assuming a working knowledge of motorcycle repair.

Crankshaft, Clutch, and Front Fork

The engine sections cover valve-shim selection, compression and oil pressure testing, and crankshaft and connecting rod oil clearances. Mixing up bearing shells during inspection can change oil clearance and damage the engine. The 1999 update identifies the first and last clutch friction plates by their different material and black surfaces. It also lists revised transmission and final-drive ratios.

Excessive force during fork separation can damage the oil seal and bushings, and bottoming the inner tube can damage the oil-lock piece. The damper rod procedure identifies Yamaha's 90890-01326 T-handle and 90890-01465 holder. Valve work calls out the 90890-04019 spring compressor and 90890-04108 attachment.

Carburetor and Electrical Changes

The 4TX1 uses paired Mikuni BDST38 carburetors (BDST38/2). The 1997 supplement lists the CH/A carburetor ID mark and jetting specifications. The 4TX4 uses BDSR38/2 carburetors and an ignitor-controlled electric fuel pump. The 1999 fuel pump circuit and operation diagrams help distinguish relay or wiring faults from a failed pump.

The 1999 supplement explains the combination meter's odometer, twin trip meters, and clock. Its signal-system tests cover the fuel sender and help separate a speedometer fault from a front-wheel speed sensor or wiring fault.

Wiring and Routing References

The D/DC circuit diagram, electric starting circuit operation chart, 1996 ignition circuit diagram, and throttle position sensor (TPS) self-diagnosis diagram show how the electrical checks tie back to individual circuits. Routing drawings map California canister hoses on the early models and throttle and clutch cables, brake hoses, fuel and carburetor heater hoses, the speed sensor lead, and the main harness on later models.

Follow Yamaha's precautions for engine support, hot coolant, brake hydraulic work, fuel testing, and the gas-charged rear shock.

Sample Radiator, Carburetor, and Clutch Specifications

The 1996 manual gives a radiator cap opening pressure of 75–105 kPa and identifies tester 90890-01325 with adapter 90890-01352.

The 1997 supplement specifies a carburetor fuel level of 15.8–16.8 mm below the Mikuni mark with the carburetors upright. It identifies fuel-level gauge 90890-01312.

For the 1999 4TX4 clutch, Yamaha lists a 50 mm standard spring free length and a 48 mm service limit.