1985–1986 Suzuki GV1200GL, Madura 1200 Service Manual (P/N 99500-39041-03E)

• Document identity and coverage: Reproduces the Suzuki Motor Corporation factory service manual for the 1985 GV1200GLF and 1986 GV1200GLG Madura, presented as a 358-page PDF. Publication P/N 99500-39041-03E, 2nd Edition, October 1990.
• Engine repair procedures: Covers compression testing, engine removal and reinstallation, complete teardown, cylinder-head and valve work, lower-end inspection, clutch and oil-pump service, transmission-gear checks, valve timing, and final reassembly.
• Shaft-drive overhaul: Details the secondary and final bevel-gear assemblies, propeller shaft, bearing inspection, preload setup, shim selection, backlash measurement, tooth-contact checks, final assembly, and the related breather circuits.
• Fuel, lubrication, and cooling work: Documents the fuel cock, pump and relay; four Mikuni BDS36SS carburetors; carburetor balancing and fuel-level checks; oil-pressure testing and the lubrication chart; plus cooling-system testing through the radiator, thermostat, water pump, fan controls, and temperature gauge.
• Chassis and hydraulic service: Covers front and rear wheels, twin front and single rear hydraulic disc brakes, front fork, steering stem, swingarm and Full-Floater rear suspension, clutch master and release cylinders, brake and clutch bleeding, hose routing, and a numbered chassis-fastener torque chart.
• Electrical diagnosis and diagrams: Includes charging, transistorized ignition, starter, combination meter/check panel, temperature and fuel-level circuits, lamps, switches, turn-signal self-canceling, system troubleshooting, full wiring diagrams, and cable, harness, and hose routing views.

Engine and Chassis Coverage

The main powertrain chapters are built around Suzuki’s water-cooled, DOHC, 82-degree V-four with TSCC combustion chambers, a six-speed constant-mesh transmission, hydraulic wet multi-plate clutch, and shaft final drive. This goes well beyond tune-up information. The manual identifies which engine components can be serviced with the engine still in the frame, then follows the larger repair jobs through removal, crankcase separation, inspection, bearing selection, transmission checks, valve timing, and final installation.

Cylinder-head work covers valves, guides, seats, springs, camshafts, cam-chain tensioners, hydraulic lash adjusters, and cam followers. The lower-end material addresses pistons and rings, connecting rods, crankshaft journals and thrust bearings, oil jets, the oil pump, starter pinion, and internal transmission. Related factory tables provide inspection standards, service limits, clearances, and component-specific tightening data without forcing the technician to piece specifications together from unrelated chapters.

Chassis repair coverage is equally specific. Front and rear wheel service, wheel and steering bearings, fork disassembly and oil-level setup, swingarm bearings, Full-Floater linkage, brake calipers and master cylinders, and clutch hydraulics each receive dedicated procedures. Brake and clutch work calls for fresh glycol-based DOT 3 or DOT 4 fluid, correct bleeding, and the documented hose routing; contaminated fluid, trapped air, or a twisted hose can compromise operation.

Model-Year, Carburetor, and Emissions Scope

The main chapters apply to the GV1200GLF. A dedicated GV1200GLG change section covers the 1986 model’s revised secondary gearbox assembly and propeller shaft, along with changed service data, torque entries, special tools, wiring diagram, and emission-control carburetor information. It contains only the work that differs from the F model; unchanged repair procedures are referenced back to the main chapters.

This is a carbureted motorcycle manual, not an electronic fuel-injection manual. Fuel-system coverage centers on four Mikuni BDS36SS carburetors and explains the diaphragm/piston, slow, transient-enrichment, main, starter, and float systems before moving into disassembly, inspection, float adjustment, fuel-level testing, and synchronization. Carburetor data is separated by I.D. numbers 05A10, 05A20 for the California model, and 05A30 for the G model. The emission-control pages also identify close-tolerance jets and factory-sealed pilot screws that must not be treated like standard adjustable carburetor parts.

California-only pages add the charcoal-canister evaporative-emission system, model-specific specifications and maintenance schedule, vapor-hose routing, and correct-versus-incorrect hose placement.

Specification Highlights

The reference section consolidates engine data for valves and guides, camshafts and cylinder heads, cylinders and pistons, connecting rods and crankshaft, pumps, clutch, and transmission. Separate tables cover shaft drive, carburetors, electrical components, brakes and wheels, suspension, tires, approved fluids, capacities, and adjustment data. Torque specifications are divided into engine, shaft-drive, and chassis groups. The periodic-maintenance chapter also supplies 29 numbered chassis bolt and nut locations with matching tightening specifications.

Suzuki tool numbers are identified throughout the procedures and in a dedicated catalog. Useful examples include the 09912-34510 cylinder disassembling tool, 09913-13121 carburetor balancer, and 09924-34510 backlash measuring tool; the G-model section adds the 09924-52410 secondary bevel-gear nut socket and 09924-52420 secondary driven-gear holder.

Useful drawing sets include the lubrication-system chart, secondary and final bevel-gear construction and tooth-contact patterns, cooling-fan control diagrams, charging and ignition circuits, the complete motorcycle wiring diagram, and cable, harness, brake, clutch, and cooling-hose routing views. The manual also flags repair traps that matter during a rebuild: loosening a connecting-rod big-end stud can disturb cap alignment, while installing a bevel-gear housing in the wrong orientation or finalizing the seals before backlash and tooth contact are checked can leave the gear setup incorrect and put the bevel set at risk.