Comprehensive BMW K100 & K75 Owners Workshop Manual for K100, RS, RT, LT and K75, C, S, T Motorcycles (1983-1987)

BMW K100 & K75 Owners Workshop Manual (1983-1987) – The Definitive "Flying Brick" Service Guide

Maintain, repair, and restore your classic BMW K-Series motorcycle with the most comprehensive resource available. This manual covers the revolutionary liquid-cooled inline engines that redefined BMW’s legacy, providing deep technical insights for both the 987cc four-cylinder (K100) and the 740cc three-cylinder (K75) models. Whether you own the original "naked" roadster or the fully-equipped Luxury Tourer, this guide delivers the professional-grade information required to keep your machine running with German precision.

Complete Model Coverage & Production Years

This manual provides specific data for models from their introduction through the 1987 production year:

• K100 Basic (1983 on) – The original unfaired roadster.
• K100 RS (1983 on) – The iconic Sports/Touring model, including the 1986 Motorsport Limited Edition and 1987 Special.
• K100 RT (1984 on) – The dedicated long-distance touring edition.
• K100 LT (1986 on) – The flagship fully-equipped Luxury Tourer.
• K75 Basic (1987 on) – Refined three-cylinder roadster.
• K75 C (1985 on) – Standard model with cockpit fairing and rear drum brake.
• K75 S (1986 on) – Sports-orientated triple with frame-mounted fairing.
• K75 T (1986 on) – US-specific tourer with high windshield.

Strategic Technical Specifications

This guide is packed with critical data to ensure your "Brick" performs at its peak. You will find:

• Engine Dimensions: Detailed bore (67mm) and stroke (70mm) specs for all models.
• Weight & Capacities: Kerb weights ranging from 503 lbs (K75 T) to 580 lbs (K100 LT), plus precise oil and coolant capacities.
• Performance Data: Compression ratios, firing orders (3-1-2 for K75; 1-3-4-2 for K100), and claimed torque/power outputs.
• Specialized Lubricants: Exact requirements for engine (API SE/SF), gearbox (SAE 80W90 GL-5), and the specific "Staburags NBU 30 PTM" compound for splined joints.

Genuine Identification & Serial Numbers

Avoid parts-ordering errors by using the manual's identification guide. It details the exact locations for factory markings:

• Engine Serial Numbers: Stamped on the raised rectangular block at the rear right-hand side of the lower crankcase, just ahead of the bellhousing joint.
• Frame Numbers: Stamped into the right-hand frame tube connecting the rear suspension mount to the gearbox, duplicated on a riveted plate.
• Production Cycles: Explanations of BMW’s September-to-August model years to help you identify mid-year technical modifications.

Detailed Workshop Features

• Step-by-Step Rebuilds: Based on a complete strip-down and rebuild by professional mechanics using standard tools.
• Scanimet Bore Technology: Expert guidance on servicing the nickel/silicon carbide plated cylinder bores.
• Fault Diagnosis: A massive 9-page section covering everything from starter motor failure to handling instability and Bosch fuel injection issues.
• Valve Clearance Mastery: Precise instructions for measuring and adjusting clearances using shims, including the TDC (Top Dead Centre) alignment process.
• Wiring & Electrical: Full-page wiring diagrams and maintenance for the electronic ignition and charging systems.

Professional Value for the DIY Mechanic

Beyond simple repairs, this manual provides value that saves you hundreds in dealership costs. It includes blueprints for fabricating your own specialized tools, such as the clutch housing locking tool and the friction plate centering tool. With detailed torque settings for every critical fastener—from cylinder head bolts to main bearing caps—you can perform high-level engine work with absolute confidence.

Empower your garage sessions and ensure your BMW K-Series survives for decades to come with this essential workshop companion.