Sachs MadAss 125 Service Manual (P/N FY152FMI)

• Covers the 125cc Sachs MadAss 125 equipped with the FY152FMI engine and 4-speed manual transmission
• Official OEM publication (P/N FY152FMI) featuring 107 pages of factory specifications and assembly data
• Includes 12 detailed wiring schematic diagrams, 16 torque reference tables, and over 10 engine assembly views
• Serves as the primary reference for internal engine, electrical, and chassis maintenance

Component and System Documentation

This service manual delivers the exact technical data needed to maintain the mechanical and electrical systems of the Sachs MadAss 125. You will find detailed breakdowns of the lubrication system, including oil pump and filter screen service, alongside critical fuel system parameters like carburetor settings and throttle valve adjustments. The transmission section maps out gear ratios, shift drum disassembly, and crankcase bearing replacement procedures. For top-end work, the guide details cylinder head service, valve clearance inspections, and complete disassembly steps. Electrical diagnostics are supported by full-page wiring diagrams, precise fuse ratings, charging coil resistance values, and ignition system testing protocols.

Specifications and Technical Data Preview

Inside, you get direct access to specification tables outlining wear limits and standard reference values for all major components. Valve clearance for both intake and exhaust is precisely documented at 0.05 ± 0.02 mm. Engine oil capacity is specified at 0.9 liters after a standard drain and 1.0 liters following a complete teardown. The ignition system data places the timing at 30° before top dead center (TDC) at 3,500 rpm. This factory workshop documentation equips professional technicians and experienced garage builders with the exact manufacturer values required for accurate maintenance. Always ensure a certified technician reviews any critical mechanical work prior to operating the equipment to maintain strict safety standards.