1996–1999 Yamaha TDM850 Service Manual
Yamaha Models Covered & Key Technical Specifications
Models: Yamaha TDM850
Sub-models / Variants: 4TX1, 4TX4
Model Years: 1996–1999
Technical Data:
- Engine Displacement: 849 cc
- Engine Type: Liquid-cooled 4-stroke, DOHC, 5-valve, forward-inclined parallel 2-cylinder
- Bore and Stroke: 89.5 mm × 67.5 mm
- Compression Ratio: 10.5:1
- Transmission: Constant mesh 5-speed
- Clutch Type: Wet, multiple-disc
- Fuel System: MIKUNI BDST38/2 carburetors
- Starter System: Electric
Yamaha Manual Features & Content Preview
The 363-page OEM workshop manual for the 1996–1999 Yamaha TDM850 (4TX-series) provides technicians and DIY mechanics with unfiltered access to factory-level specifications. Rather than generic overviews, this documentation dives straight into the hard numbers required for the 849 cc parallel-twin engine. It details exact valve clearance settings, carburetor synchronization parameters, and compression pressure benchmarks. While this publication serves as a highly detailed reference for chassis geometry and electrical diagnostics, anyone performing maintenance should possess the necessary mechanical training to handle high-pressure systems, fluid handling, and heavy components safely.
1996–1999 Yamaha TDM850: Technical Data Preview
Mechanics will find the maintenance tables particularly useful for bench work. Engine internal specifications are laid out clearly and without ambiguity. For instance, intake valve clearance is strictly set at 0.15–0.20 mm, while the exhaust clearance stands at 0.25–0.30 mm. The fuel delivery system relies on twin Mikuni BDST38 carburetors. You will find complete idling speed ranges dialed in between 1,050 and 1,250 r/min. Fastener torque is another critical area covered in depth. The documentation maps out exact torque values for over 60 specific chassis and engine bolts, including the mandatory tightening sequence for crankcase assembly to guarantee structural integrity.
Quick-reference fluid capacities are fully documented, calling for a 3.5 L engine oil volume and a 1.7 L total coolant capacity. On the electrical side, diagnostics revolve around a 12 V 10 AH battery configuration. T.C.I. ignition timing is specified at 10° at 1,150 r/min. The manual wraps up with exhaustive cable routing charts to ensure wiring harnesses are routed correctly and safely away from engine heat sources.
- Covers 1996–1999 Yamaha TDM850 4TX models, encompassing both 4TX1 and 4TX4 variants equipped with the 849 cc liquid-cooled parallel-twin engine.
- Official Yamaha publication P/N 4TX-AE1, 1996 first edition.
- Contains 47 exploded-view assembly diagrams for parts identification and teardown reference.
- Includes 18 dedicated wiring-relevant cable routing charts for exact factory harness placement.
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