Harley-Davidson Dyna Super Glide Sport (FXDX Twin Cam 88) — OEM Fluid, Tire Pressure & Maintenance Specs
1,449cc Air-Cooled 45° V-Twin Twin Cam 88 (5-Speed Gearbox) · Source: Harley-Davidson Dyna Super Glide Sport (FXDX Twin Cam 88) (1999–2005) Official Owner’s Manual Maintenance Specifications
According to the Harley-Davidson Dyna Super Glide Sport (FXDX Twin Cam 88) (1999–2005) Official Owner’s Manual Maintenance Specifications, the 1999–2005 Harley-Davidson Dyna Super Glide Sport (FXDX Twin Cam 88) (chassis FXDX/FXDXT (T-Sport)) requires 2.4 L (2.54 US qt) of SAE 20W-50 (JASO MA2, H-D 360 SAE 20W-50 / SYN3) engine oil for a drain-only change and 2.8 L (2.96 US qt) with filter service (HD 63798-99A / 63731-99A (HF171C)). Standard solo cold tire pressure is 207 kPa / 2.07 bar / 30 PSI front (100/90-19 57H) and 248 kPa / 2.48 bar / 36 PSI rear (150/80B16 71H), paired with 2× HD 6R12 (32362-04A) spark plug(s) and a YTX20HL-BS / YIX30L-BS battery.
Drain only: 2.4 L (2.54 US qt)
R 248 kPa (2.48 bar)
Est. Range: ~337 km (209 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Wet Multi-Plate Manual Clutch NEVER use JASO MB |
|---|---|
| Recommended Viscosity & Grade | SAE 20W-50 · JASO MA2 · H-D 360 SAE 20W-50 / SYN3 |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 2.4 L (2.54 US qt) • With filter/strainer: 2.8 L (2.96 US qt) • Complete dry overhaul: 3.2 L (3.38 US qt) |
| OEM Oil Filter Code & Type | HD 63798-99A / 63731-99A (HF171C) |
| Correct Oil Level Check Method | At full operating temperature resting ON THE SIDESTAND (Jiffy Stand); thread dipstick in to read |
| Oil Drain Bolt Torque | 24 N·m (17.7 lb-ft / 2.45 kgf·m) — Use fresh crush washer |
| Primary Chaincase Fluid | 770 ml (0.77 L) — H-D Formula+ Primary Fluid (1,120 ml / 38 oz) |
| Separate Transmission / Gearbox Oil | 710 ml (0.71 L) — H-D Formula+ or SAE 80W-140 Gear Oil (830 ml / 28 oz) |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 100/90-19 57H · Rear: 150/80B16 71H (Tubeless) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 207 kPa / 2.07 bar / 30 PSI Rear: 248 kPa / 2.48 bar / 36 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 207 kPa / 2.07 bar / 30 PSI Rear: 276 kPa / 2.76 bar / 40 PSI |
| OEM Spark Plug & Quantity | HD 6R12 (32362-04A) × 2 (Gap: 0.97–1.09 mm) |
| OEM Battery Code & Rating | YTX20HL-BS / YIX30L-BS (12V 18–28Ah Heavy-Duty AGM) |
| Final Drive Maintenance | Carbon/Aramid Reinforced Secondary Belt — Inspect belt deflection and pulley debris |
| Brake Fluid & Coolant | DOT 5 (Silicone) · Air/Oil-Cooled Engine (No liquid coolant) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 1449 cc · 68 hp @ 5,200 rpm · 108 N·m (79.7 lb-ft) @ 3,400 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 715 mm (28.1 in) · 298 kg (657 lbs) |
| Fuel Tank & Est. Real-World Range | 18.5 L (4.9 US gal) · ~18.2 km/L → ~337 km (209 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,600 km • Engine Oil / Filter: 8,000 km / 8,000 km • Air Filter / Spark Plug: 24,000 km / 32,000 km • Valve Clearance Check: 48,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Revered as the blueprint for club-style Dynas from 1999 to 2005, the TC88 FXDX packed fully adjustable Showa suspension and dual front discs, using spring cam tensioners and DOT 5 Silicone fluid.
Oil & Clutch Mechanical Engineering Note
Inspect TC88 spring-loaded cam-chain tensioner shoes regularly, run 2.8 L of SAE 20W-50 in the 3-Hole system, and bleed brakes strictly with DOT 5 Silicone fluid.