Market Position:
The 1985 Harley-Davidson FXSB Low Rider was a significant model in the cruiser segment, offering a blend of classic Harley styling with an emphasis on rider comfort and a more accessible riding position than previous models. It appealed to riders seeking a versatile cruiser for both short rides and longer journeys.
Competitors:
Competed against other large-displacement V-twin cruisers from American and emerging Japanese manufacturers, though its distinct styling and brand heritage gave it a unique market presence.
Key Features:
Distinctive 'low rider' styling, comfortable riding position with forward controls and pullback handlebars, reliable Shovelhead engine (transitioning from earlier evolutions), robust Shovelhead-era chassis.
Value Proposition:
Provides comprehensive factory-level diagnostic, repair, and maintenance information essential for preserving the performance and longevity of this classic Harley-Davidson motorcycle.
Engine:
Complete overhaul, tuning, carburetor systems (Keihin butterfly style, linkages, jetting), ignition system (points, coil, spark plugs), oil pump, lubrication, cooling (air-cooled specific details).
Transmission:
4-speed constant mesh, clutch operation and adjustment, gearbox disassembly and reassembly, shift mechanism, primary drive chain adjustment and inspection.
Chassis:
Frame inspection and repair, front fork (Show/Stroked leading axle), steering head bearings, rear shock absorbers and mounting, wheel bearings, swingarm pivot.
Electrical:
Wiring diagrams, battery maintenance, charging system (alternator, regulator/rectifier), lighting (headlight, taillight, turn signals), starter system, ignition switch, horn.
Brakes:
Front disc brake system (caliper, master cylinder, hydraulic lines, pad replacement), rear drum brake system (shoe replacement, adjustment, linkage).
Fuel System:
Fuel tank removal and installation, fuel lines, fuel filter replacement, carburetor troubleshooting and adjustment.
Bodywork:
Fender removal and installation, seat mounting, fuel tank mounting, handlebar removal and installation, control cable routing and adjustment.
Maintenance:
Routine servicing (oil changes, filter replacement, spark plug checks), chain lubrication and adjustment, brake inspection, tire pressure checks, battery conditioning.
Troubleshooting:
Diagnostic charts for common engine starting issues, running problems, electrical faults, braking inefficiencies, and transmission quirks.
Repair:
Step-by-step instructions for component disassembly, cleaning, inspection, repair, and reassembly of all major motorcycle systems.
Rebuild:
Detailed procedures for engine overhaul (top-end and bottom-end), transmission rebuild, and brake system overhaul.
Adjustment:
Carburetor idle and mixture adjustments, clutch and throttle cable adjustments, ignition timing adjustments, brake lever and pedal free play adjustments.
Installation:
Component replacement instructions for wear items and upgrades, including electrical components, brake pads, and suspension parts.
Depth:
Comprehensive coverage from basic user maintenance to advanced mechanical and electrical diagnostics and repairs. Suitable for DIY mechanics and professional technicians.
Engine Type:
Air-cooled, 45-degree V-twin, OHV (Overhead Valve)
Engine Family:
Shovelhead
Displacement:
1339 cc (82 cubic inches)
Bore X Stroke:
3.4375 in x 4.25 in (87.3 mm x 108 mm)
Compression Ratio:
8.0:1 (Typical)
Horsepower:
Approx. 60-65 HP (Est.)
Torque:
Approx. 70-75 ft-lbs (Est.)
Carburetor:
Keihin butterfly type (e.g., Keihin CV or similar era specific)
Fuel Type:
Unleaded gasoline (87 octane minimum recommended)
Ignition Type:
Contact breaker points and coil ignition system
Oil System:
Dry sump lubrication system with oil tank separate from crankcase.
Oil Type Spec:
Refer to manual for specific Harley-Davidson approved oils (e.g., SAE 20W-50 motorcycle specific oil).
Cooling Method:
Air cooling via finned cylinders and heads, and directed airflow.
Transmission Type:
4-speed, constant mesh, foot shift, hand clutch
Primary Drive:
Multi-plate dry clutch, chain driven
Secondary Drive:
Belt drive
Gear Ratios:
Specific ratios would be detailed in the manual, but typical for this era's 4-speed would have a reduction in each gear.
Transmission Fluid:
Refer to manual for specific Harley-Davidson transmission lubricant (often heavier weight gear oil or specific Harley-Davidson formulation).
Oil Change Interval:
Typically every 2,000-3,000 miles or annually, whichever comes first. Refer to manual for exact specifications.
Primary Chain Adjustment:
Check and adjust as needed, typically every 5,000 miles or if slack exceeds specifications. Refer to manual for precise interval and procedure.
Spark Plug Replacement:
Typically every 5,000-10,000 miles. Refer to manual for exact interval and recommended spark plug type (e.g., Champion or NGK).
Engine Oil Capacity:
Approx. 3 US quarts (2.8 liters) including filter. Refer to manual for exact capacity and dipstick procedure.
Transmission Oil Capacity:
Refer to manual for specific capacity (typically around 1 quart or 1 liter).
Brake Fluid:
DOT 4 or DOT 5 (silicone-based) depending on original specification and brake system components. Manual is crucial for determining correct type.
Common Issues:
Shovelhead engines can be prone to oil leaks if seals are not maintained. Carburetor tuning can be sensitive to altitude and temperature. Electrical connections can corrode over time. Clutch adjustment is critical for smooth shifting. Primary chain tensioner wear.
Wear Items:
Clutch plates, brake pads, wheel bearings, steering head bearings, fork seals, drive belt, tires.
Brand Heritage:
Harley-Davidson boasts a rich heritage dating back to 1903, synonymous with American motorcycle culture, V-twin engines, and a distinctive riding experience.
Model Lineage:
The FXSB Low Rider is part of the FX series, which historically represented the 'super-glide' and custom styling. It evolved from earlier FXR and FX models, incorporating styling cues and chassis developments to meet rider demand for a more comfortable, custom-look cruiser.
Production Years:
The FXSB model was produced for a limited period, with the 1985 model being a specific iteration. Harley-Davidson has a long history of model variations and updates.
Manufacturing Location:
United States
