2001 Buell M2/M2L Cyclone Factory Service Manual (P/N 99491-01Y)

This factory service manual covers the 2001 Buell M2 and M2L Cyclone, identified by P/N 99491-01Y, with seven service sections and supporting appendices.

• Engine repair: Engine removal, cylinder-head and valve service, cylinder and piston inspection, hydraulic lifter work, crankcase separation, and bearing fitting.

• Fuel delivery: Keihin CV carburetor troubleshooting and overhaul, float-level adjustment, intake-manifold service, and California evaporative-emissions checks.

• Drive and transmission: Primary-chain adjustment, clutch-pack inspection, gearshaft and bearing service, transmission installation, and shifter-pawl adjustment.

• Chassis and brakes: Front-fork seal and bushing replacement, wheel and steering-head bearings, master-cylinder and caliper service, brake bleeding, and suspension setup.

• Starting and electrical diagnosis: Starter current-draw and voltage-drop tests, ignition and charging checks, V.O.E.S. testing, and starter-interlock fault tracing.

• Workshop references: Component-specific torque tables, new-component specifications, service wear limits, exploded assembly views, wiring diagrams, and tool identification.

Suited to experienced mechanics equipped for precision measurements and electrical testing; Buell specifically recommends qualified technicians for brake repairs.

Thunderstorm Engine Teardown and Cam-Gear Matching

Compression and cylinder leak-down diagnosis accompany the internal engine repair procedures. Valve Seat Angles views and Internal Engine Passages diagrams show the valve geometry and lubrication routing.

The crankcase chapter covers flywheel end-play checks and bearing selection, but specifies factory service or replacement of the flywheel/connecting-rod assembly as a unit.

Gearcase service addresses high-contact-ratio cam gears supplied with camshafts as matched sets. A pre-2000 gearcase cover gasket can obstruct the oil gallery and damage the engine.

M2/M2L Suspension Differences and Brake Service

The M2L uses a shorter front fork with the same repair procedures as the M2. Separate spring wear limits and oil-level specifications help prevent applying standard-fork inspection data to the shorter assembly.

Rear-shock coverage addresses replacement, preload, and rebound/compression damping adjustment. The rear shock and front-fork damper assemblies have no user-serviceable internal parts.

Brake procedures extend to master-cylinder and caliper inspection, seal replacement, and bleeding. The manual specifies black banjo washers because older silver washers can lose their seal with D.O.T. 4 fluid.

Engine and chassis work requires secure lifting and support.

Clutch, Gearbox, and Drive-Belt Work

The drivetrain chapter details clutch-spring compression, plate inspection, shift-fork and drum inspection, and mainshaft/countershaft assembly. Drive Belt Wear Patterns and Recommended Actions illustrations support belt-condition assessment.

The transmission sprocket nut has left-hand threads and a separate torque-turn specification. Tool references identify clutch spring compressor HD-38515-A and mainshaft locknut wrench HD-94660-37B.

Carburetor and Electrical Fault Tracing

Keihin CV troubleshooting separates overflow, poor idling, acceleration, and vacuum-piston faults. California emissions coverage includes the vapor canister, tank venting, and hose connections.

Starting System Diagnosis flowcharts and the Electric Starting System Circuit drawing connect test results with battery, relay, solenoid, and interlock faults, helping isolate a starting problem before replacing the starter.

Ignition coverage includes static and dynamic timing checks and adjustment. Wiring references identify both 12-place Deutsch ignition-module connectors, while the appendix explains Deutsch and AMP Multilock terminal service. Metric conversion tables supplement the component-specific references.

A Preview of Chassis Torque and Fluid-Capacity Data

Chassis torque tables list the rear axle nut at 66–73 ft-lbs (90–99 Nm) and front brake caliper mounting screws at 22–25 ft-lbs (30–34 Nm), with red LOCTITE 271 specified for the caliper screws.

Fluid-capacity data specifies 2.0 quarts (1.89 liters) for the engine oil tank with a filter change, and 1.0 quart (0.95 liter) for the primary drive/transmission. These maintenance figures accompany the relevant fluid-level guidance.

Searchable Service Text, Bookmarks, and PDF Contents

Search, navigation, and wiring detail: Service text and appendices contain searchable PDF text, but many diagram labels are not searchable. Embedded bookmarks navigate service topics and appendices. Small labels in the large wiring diagrams require zooming, and the circuit lines are light.

Supplied as one printable English PDF with 395 pages, including the opening contents page, all three appendices, nine blank or placeholder pages, eight notes pages, and the closing appendix contents page.