1993 Yamaha MM600D MM700D Snowmobile Service Manual (P/N LIT-12618-02-12, 8EJ-28197-10)

• Exact model coverage: Yamaha MM600D and MM700D snowmobiles; the specification tables identify the MM600 as model code 8EJ and the MM700 as model code 8ED.
• Engine and fuel-system work: engine removal and installation, cylinder-head and cylinder service, piston and reed-valve inspection, crankcase and crankshaft work, oil-pump bleeding, carburetor synchronization, fuel-level adjustment, and fuel-pump testing.
• Clutch and driveline repair: primary- and secondary-sheave removal, disassembly, inspection, assembly, and adjustment, plus drive-belt setup, chaincase and jackshaft service, gear selection, and high-altitude clutch tuning.
• Chassis and brake procedures: steering and ski service, spindle-camber and ski-alignment adjustment, front and slide-rail suspension repair, track installation and tensioning, and hydraulic caliper, master-cylinder, pad, and bleeding procedures.
• Cooling-system coverage: coolant replacement and air bleeding, leak and filler-cap pressure testing, and removal, inspection, and installation of the heat exchangers, water pump, and thermostatic-valve components.
• Electrical diagnosis: ignition, lighting, signal, and grip-warmer circuit diagrams with fault-isolation charts, component resistance and continuity tests, a full MM600/MM700 wiring diagram, and detailed cable, hose, and harness routing views.

This 213-page factory service manual PDF carries Yamaha identifiers LIT-12618-02-12 and 8EJ-28197-10 on the cover. It is the first edition, published in June 1999. Yamaha wrote it primarily for its dealers and qualified mechanics, and it assumes a working knowledge of snowmobile mechanical concepts and repair procedures rather than teaching basic shop practice.

Exact Model and System Scope

Both covered machines use liquid-cooled, crankcase-reed, forward-inclined parallel three-cylinder two-stroke engines with Yamaha Autolube. The MM600 uses the 593 cc engine and three TM31 Mikuni carburetors; the MM700 uses the 698 cc engine and three TM33 units. The specification section identifies an automatic centrifugal V-belt clutch, chain secondary drive, CDI ignition, recoil starting, and no reverse system. Frame and engine serial-number locations are shown for machine identification.

Repair Depth and Reference Data

The engine chapters go beyond routine maintenance. They provide the removal sequence, exploded assembly views, inspection points, wear limits, and reassembly information for the exhaust, complete engine assembly, cylinders, pistons, reed valves, crankcase, crankshaft, CDI magneto, and recoil starter. Separate cooling and carburetion chapters cover the water pump, heat exchangers, triple-carburetor rack, float system, and diaphragm fuel pump.

Power-train coverage includes clutch bushings, weights, rollers, springs, torque cam, drive chain and sprockets, chaincase bearings and seals, brake disc and jackshaft, slide-rail suspension, front axle, and track. Component-specific torque tables, lubrication requirements, clearances, wear limits, capacities, and installation notes are placed with the repair procedures, with consolidated engine, power-train, chassis, and electrical specifications in Chapter 9.

Tuning, Troubleshooting, and Diagrams

Model-specific high-altitude tables coordinate carburetor jetting, needle position, gearing, clutch weights, springs, and secondary-spring setup across temperature and elevation ranges. The manual also covers sheave distance and offset, engagement and shift-speed checks, T.O.R.S. testing, carburetor troubleshooting, suspension settings, ski toe-out, and spindle camber.

Electrical support includes the ignition-system, lighting-system, signal-system, and grip-warmer circuit diagrams, each paired with troubleshooting logic and meter checks. A complete wiring diagram and several pages of connector, harness, cable, and hose routing drawings help verify the final installation after engine, carburetor, steering, or electrical work.

Factory Tools and Repair Cautions

The special-tool section gives Yamaha part numbers and intended uses. Examples include sheave gauge YS-42421-1, clutch spider separator YS-28890-B, YXR clutch bushing jig kit YS-39752, piston-pin puller YU-01304, cooling-system tester YU-24460-01, Mity Vac YB-35956, and pocket tester YU-03112; European equivalents are listed where applicable.

The clutch chapter flags the primary-sheave spider's left-hand thread and warns that poor support during high-torque separation can crack the sheaves or spider. The chaincase section also requires its spacers to return to their original positions; incorrect placement can bind the brake disc and jackshaft. Spring-loaded clutch work, hydraulic brake repair, pressurized cooling-system checks, and any procedure requiring the track to run off the ground call for the specified tools, secure support, and the manual's safety precautions.