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Dedicated Subsystem WorkbenchPlatform Gen: 1986–2026

2023 Harley-Davidson Heritage Classic / 114 (FLSTC / FLHC / FLHCS) Oil Capacities, Coolant & Fluid Specifications

Verified fluid capacities for 2023 Harley-Davidson Heritage Classic / 114 (FLSTC / FLHC / FLHCS): engine oil 4.70 L (5.00 US qt), viscosity H-D Screamin' Eagle SYN3 20W-50 Full Synthetic or Genuine H-D 360 20W-50, coolant Not Applicable (Air / Oil Cooled), brake fluid, and fork oil levels.

Technical PassportOEM VERIFIED
Engine
1868cc
Cooling
Air / Oil-Cooled with Dual Internal Counterbalancers
Final Drive
Belt Drive
Engine Oil
4.70 L (5.00 US qt)
Spark Plug
H-D 6R10 / 6R12
Front Tire
130/90B16 73H
Gen 1986–2026

Factory Platform Compatibility: All workshop fluid capacities, maintenance milestones, torque specifications, and consumables on this specification sheet are factory-identical across model years 1986 through 2026.

SPECS-TO-CART BUNDLESFactory Direct-Fit Maintenance Bundles Available
1-Click verified Motul engine oil service kits, race filters, spark plugs, and brake fluid pre-measured for this 2023 Harley-Davidson Heritage Classic / 114 (FLSTC / FLHC / FLHCS).
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Select Model Year:(Active: 2023)
41 Production Years (1986–2026)
Suggested Items4 Verified Workshop Consumables Available for this Job
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Fluids & Service Capacities
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Engine Oil (Drain & Filter Change)4.70 L (5.00 US qt)
Engine Oil (Drain Only)N/A
Recommended Oil ViscosityH-D Screamin' Eagle SYN3 20W-50 Full Synthetic or Genuine H-D 360 20W-50
Coolant System CapacityNot Applicable (Air / Oil Cooled)
Brake Fluid StandardNot Available
Drivetrain, Chain & Gearing
Drive Chain PitchBelt Drive
Chain Link Count133-Tooth Carbon-Fiber Reinforced (24mm width)
Front Sprocket TeethN/A
Rear Sprocket TeethN/A
Final Drive ConfigurationCarbon Belt Drive
Ignition & Electrical Specifications
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OEM Spark Plug Part NumberH-D 6R10 / 6R12
Electrode Spark Plug Gap0.8–0.9 mm (0.031–0.035 in)
OEM Battery Reference CodeYTX20HL-BS / H-D 65989-97E
Battery Output & RatingNot Available
Spark Plug Inspection IntervalN/A
Wheels, Tires & Inflation Pressures
Front Tire Dimensions130/90B16 73H
Cold Front Inflation PressureN/A
Rear Tire Dimensions150/80B16 77H
Cold Rear Inflation PressureN/A
OEM Wheel Rim Widths (F / R)3.50" / 5.50"
Verified OEM Wheel Fitment: 130/90-16 (F) + 150/80-16 (R)
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Official NHTSA Safety Recalls & Technical Bulletins

2 Active Campaigns
U.S. Department of Transportation compliance database (Title 49 U.S.C. Chapter 301).
Verify VIN on NHTSA.gov
The U.S. National Highway Traffic Safety Administration reports 2 safety recall campaigns associated with this platform. Independent repair shops and riders should confirm that authorized dealership warranty remedies have been applied.
NHTSA #25V375000SUSPENSION:REAR:SHOCK ABSORBER
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Defect Description

Harley Safety Recall 0188: 2018–2024 Heritage Classic rear shock pre-load adjuster mounting tab can fracture under vibration.

Safety Hazard / Consequence

Adjuster displacement can lead to tire contact and pressure loss.

Factory Remedy & Repair Action

Dealers install reinforced retention bracket countermeasure kit.

NHTSA #23V591000SUSPENSION:REAR:SHOCK ABSORBER
▼
OEM Workshop Archives

Official Factory Service Bulletins & Field Updates

2 Documented Bulletins
Bulletin #HD-0181Safety Recall Bulletin 0181 & 0182 / NHTSA 23V-591: Softail Rear Shock Absorber Pre-Load Fastener Rear Tire Contact
Source: RCLRPT-23V591-6615.PDF
Mandated Torques:Torque: 12–15 N·m (106–133 in-lb) (Pre-load Adjuster Bracket Mounting Screw)Torque: 95–108 N·m (70–80 lb-ft) (Upper & Lower Shock Eye Mount Bolts)Torque: 136–149 N·m (100–110 lb-ft) (Rear Axle Cone Nut)
Consumable Specs:Loctite 243 Medium Strength Blue ThreadlockerIsopropyl Alcohol Surface Cleaner
Genuine Part Numbers:102008499150010454000142
Recalls 0181 & 0188 • NHTSA 23V-591 & 25V-375

Harley-Davidson Softail Mono-Shock Pre-Load Adjuster & Tire Clearance Architecture

Fast adjuster bracket reinforcement, tire clearance inspection (≥ 10 mm), and 95–108 N·m shock mounting torques.

SOFTAIL HIDDEN MONO-SHOCK CHASSISFRONT EYE: 95-108 N·mREAR EYE: 95-108 N·mKNOB (0-5)BRACKET: 12-15 N·mLOCTITE 243 BLUE240mm REAR TIREGAP ≥ 10 mmMANDATED SERVICE & RECALL PROTOCOL:• Fastener: Retorque adjuster screw to 12–15 N·m (106–133 in-lb) with Loctite 243 Blue.• Bracket Kit: Install reinforced retention bracket (Recall 0188 countermeasure).• Clearance: Verify ≥ 10 mm air gap between adjuster knob and tire across full stroke.
Shock Mounting Bolts95–108 N·m (70–80 lb-ft)
Adjuster Bracket Screw12–15 N·m (106–133 in-lb)
Chemical ThreadlockerLoctite 243 (Medium Blue)
Dynamic Tire Clearance≥ 10.0 mm (0.39 in)
Bulletin #HD-TSB-18-09Technical Service Bulletin TSB-18-09: Softail Laced Wheel Spoke Truing, Nipple Torques & Secondary Drive Belt Deflection
Source: H-D_TSB_18-09_Laced_Spokes.pdf
Mandated Torques:Torque: 6.2 N·m (55 in-lb) (Spoke Nipples - Uniform Torque Check)Torque: 136–149 N·m (100–110 lb-ft) (Rear Axle Nut)Torque: 20–24 N·m (15–18 lb-ft) (Belt Tensioner Adjuster Jam Nuts)Torque: 102 N·m (75 lb-ft) (Front Axle Shaft)
Consumable Specs:Spoke Nipple Anti-Corrosion PenetrantAnti-Seize Lubricant (Axle Sliders)
Genuine Part Numbers:43057-084090039241500017
Workshop Procedure • Heritage & Street Bob

Harley-Davidson Heritage Classic Secondary Belt Drive Tension & Axle Alignment

Secondary belt deflection gauge procedure (9.5–12.7 mm @ 10 lbs), axle alignment notch verification, and 136–149 N·m cone nut.

32T TRANSMISSION PULLEY66T / 68T WHEEL SPROCKET10 LBSDEFLECTION: 9.5-12.7 mm(3/8 - 1/2 in COLD ON JFFY STAND)AXLE NUT: 136-149 N·mALIGNMENT NOTCH: ±0.8 mmJAM NUTS: 20-24 N·mHERITAGE SPECS:• Front Rim: 16 x 3.0 in• Rear Rim: 16 x 3.0 in• Front Tire: 130/90B16 (36 psi)• Rear Tire: 150/80B16 (40 psi)• Front Axle: 102 N·m• Rear Axle: 136–149 N·m• Belt Deflection: 9.5–12.7 mm• Adjuster Jam Nut: 20–24 N·m• Pulley Bolts: 75–88 N·m + 45°• Spoke Nipple: 6.2 N·m (55 in-lb)• Rotor Bolts: 41–47 N·m• Caliper Mounts: 38–52 N·m
Belt Deflection @ 10 lbs9.5–12.7 mm (3/8–1/2 in)
Rear Axle Cone Nut136–149 N·m (100–110 lb-ft)
Tensioner Jam Nuts20–24 N·m (15–18 lb-ft)
Laced Spoke Nipples6.2 N·m (55 in-lb)
1-Click Factory Service KitOEM Spec Fluid Capacities Matched

Workshop Maintenance Kit & Factory Fluids

Authentic factory-grade motor oil, oil filter, and high-temp brake fluid matched precisely to 2023 Harley-Davidson Heritage Classic / 114 (FLSTC / FLHC / FLHCS) capacities.

Full Kit Subtotal
$47.80
SPECS-TO-CART BUNDLESDedicated Direct-Fit Maintenance Bundles Available
Explore interactive 1-click oil change packs, brake flush kits & major tune-up bundles pre-measured for this 2023 Harley-Davidson Heritage Classic / 114 (FLSTC / FLHC / FLHCS).
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Silkolene Comp 4 4T Oil 20W-50 (1 Quart)
20W-50 Heavy-Duty Synthetic

Silkolene Comp 4 4T Oil 20W-50 (1 Quart)

1-Quart Bottles (x4 Included)
Matches factory 20W-50 spec (Oil spec: 4.70 L (5.00 US qt))
Item Price
$47.80($11.95 ea)
Factory OEM Spark Plug Spec

H-D 6R10 / 6R12

Gap: 0.8–0.9 mm (0.031–0.035 in)
Inspection milestone: Not Available. Exact factory part specification.
Authentic OEM Reference
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Complete Workshop Maintenance Package3 Essential Service Items
Includes 20W-50 Heavy-Duty Synthetic engine oil (1-Quart Bottles (x4 Included)), high-flow filter & DOT 4 fluid.
Kit Total
$47.80

Explore Other Subsystems for this 2023 Harley-Davidson Heritage Classic / 114 (FLSTC / FLHC / FLHCS)

Jump straight into dedicated factory specifications and interactive workshop diagnostic engines.

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Subsystem Guide/torques

Fastener Torques

Engine drain plug, axle spindles, caliper mounts, triple clamp pinch bolts & thread lubrication derating guide.

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Subsystem Guide/fuses-relays

Fuses & Relays

Main: N/A • Location: N/A

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Subsystem Guide/compression

Compression & Leakdown

Ratio: N/A

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Subsystem Guide/valves

Valve Clearances

Intake: N/A mm • Exhaust: N/A mm

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Subsystem Guide/fuel-delivery

Fuel Delivery & TB Sync

Idle: N/A • Rail Pressure: N/A • Vacuum: N/A

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Subsystem Guide/electrical

Charging & Battery

Battery: YTX20HL-BS / H-D 65989-97E

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Subsystem Guide/tires

Tires & Gearing

Front: 130/90B16 73H • Rear: 150/80B16 77H

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Subsystem Guide/suspension

Suspension & Sag

Front Travel: N/A • Rear Travel: N/A

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Subsystem Guide/maintenance

Maintenance Schedule

Oil: N/A • Valves: N/A • Plugs: N/A

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