Harley-Davidson FLHR Road King (Milwaukee-Eight 107, 2017+) Maintenance Schedule

This is the maintenance schedule for the FLHR Road King with the Milwaukee-Eight motor made from 2017 onward, sourced from the owner’s manual. It replaces the earlier Twin Cam 103 Road King, most recently the High Power Twin Cam 103 Road King.

The Harley-Davidson Road King is the stripped down bagger in the Motor Company’s touring line.

It’s powered by the smaller of the Milwaukee-Eight motors, the 107 c.i. (1746 cc) air/oil-cooled V-twin with four valves per cylinder. H-D quotes peak torque of 111 lb-ft (150 Nm) at 3250 rpm. Final drive is via a 6-speed transmission and a belt.

Harley-Davidson also makes a higher-spec FLHRXS Road King Special with the higher-spec Milwaukee Eight 114 motor (since 2019), a different sized front wheel, no windshield, and a number of cosmetic differences.

2020 Harley-Davidson FLHR Road King RHS 3-4
Harley-Davidson FLHR Road King

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Harley-Davidson FLHR Road King (2017+) Service Intervals

Like most Harley-Davidson motorcycles, the Harley-Davidson FLHR Road King (2017, with the Milwaukee-Eight engine) has 5000 mile / 8000 km or annual service intervals.

At every service, change the oil and filter, and look over the motorcycle for items needing lubrication, adjustment, or cleaning. Also check wearable items (like hoses and tires) to see if they’re still in good condition.

As the Road King (and nearly every Harley-Davidson) has self-adjusting hydraulic valve lifters, there is no valve service interval. However, Harley-Davidson does suggest you change the spark plugs every 30000 miles / 48000 km or two years. Of course, if valves become noisy, then have a mechanic look at them, as some section of the system may have failed.

As well as engine oil, you need to periodically replace both primary chaincase lubricant and transmission lubricant.

A number of items need to be done less frequently, like changing the brake fluid. See the schedule for more details.

Harley-Davidson FLHR Road King (2017+) Maintenance Schedule

Below is the maintenance schedule for the FLHR Road King. The Road King has the standard Milwaukee-Eight 107 motor, not the larger capacity variant, nor the Twin-Cooled (liquid-cooled) version seen in some of the Ultra or CVO models.

Maintenance Schedule

Below is the maintenance schedule for the Harley-Davidson FLHR Road King.


  • To keep the schedule more readable, we’ve cropped it at 30000 miles / 48000 km. Keep repeating it in the pattern shown.
  • Follow the earlier of time-based or distance-based service intervals.
mi x 1000151015202530
km x 10001.681624324048Every
Inspection checklist (see below) – PerformYear (some items only)
Engine oil – ReplaceYear
See notes below
Oil filter – ReplaceYear
Air cleaner filter – Inspect
Clean as necessary in lukewarm water with mild detergent
More often if riding in severe conditions.
Spark plugs – Replace2 years
(Spoked rims) Spoke tightness (front and rear) – CheckMore often if riding in severe conditions.
Hand control switch housing screw torque – TightenYear
Front brake handlebar clamp screw torque – TightenYear
Steering head bearings – Lubricate
Windshield bushings – Inspect
Primary chaincase lubricant – ReplaceMore often if riding in severe conditions.
Transmission lubricant – ReplaceMore often if riding in severe conditions.
Brake systems – Replace (use DOT 4 fluid)2 years
(2017-2020 Hydraulic clutch models) Clutch fluid – Replace2 years
Front and rear axle nut torque – TightenYear
12 battery – Check battery, terminal torque, and clean connections. Lubricate with electrical contact lubricantYear
Fuel filter – Replace100000 mi (161000 km)
Harley-Davidson Milwaukee-Eight (Air/Oil-cooled) Touring Maintenance Schedule

Standard Inspection Checklist

Below is the standard inspection checklist for the Road King (Milwaukee Eight). Do these items per the schedule above.

Not all items need to be checked annually — those that are are marked on the right.

Note that from 2017-2020, the Road King and other Tourers had a hydraulic clutch (The Road King didn’t get the Project Rushmore hydraulic clutch in the Twin Cam generation, unlike other Tourers). Harley-Davidson went back to a cable clutch from 2021.

Standard Inspection Checklist — Milwaukee EightAnnual
Drive belt and sprockets – Inspect
Drive belt – Check / Adjust tension
Rear sprocket isolators – Inspect at every tire change
Electrical equipment and switches – Inspect
Tire pressure and tread (front and rear) – Check
Brake and clutch controls – Lubricate
Brake pads (front and rear) – Wear check
Minimum thickness: 0.4 mm / 0.016 in
Brake fluid level (front and rear) – Inspect level (fluid drops as pads wear), and check moisture content. Replace if moisture over 3%.
2017-2020: Clutch fluid level – Inspect level and check moisture content. Replace if moisture over 3%.
2021+: Clutch cable – Adjust and check for leaks, contact, or abrasion. Lubricate cable with Harley-Davidson lubricant
Oil cooler – Clean
Oil and brake lines – Inspect
Jiffy stand – Lubricate
Exhaust system, fasteners, and shields – Inspect
Fuel door hinge and latch – Lubricate
Component and system function – Road test
Standard Annual Service (Harley-Davidson Milwaukee Eight, Air/Oil-Cooled)

Wheel / Tire Size

The FLHR Road King ships with Dunlop bias blackwall tires, custom-made for Harley-Davidson.

In 2020, Harley-Davidson changed the standard tire sizes for the base model FLHR Road King. See the two tables below.

2017-2019 Road King tire sizes:

WheelWheel sizeTire sizeTire pressure (cold)
Front17 x 3 in130/80B17 65H36 psi / 248 kPa
Rear16 x 5 in180/65B16 81H36 psi / 248 kPa
Tire sizes and pressures – 2017-2019 Road king

2020+ Road King tire sizes:

WheelWheel sizeTire sizeTire pressure (cold)
Front18 x 3.5 in130/80B18 63H36 psi / 248 kPa
Rear18 x 5 in180/55B18 80H40 psi / 276 kPa
Tire sizes and pressures – 2020+ Road king

Oil Change on the FLHR Road King

There are three fluids that need to be changed on the Road King.

For all of them, you can use Castrol V-Twin 20W50, a popular oil for Harley-Davidson motorcycles.

  • Engine oil (See below table)
  • Primary chaincase lubricant (1L of Formula+ Transmission and Primary Chaincase Lubricant OR Screamin’ Eagle Syn3 Synthetic 20W50)
  • Transmission lubricant (1L of Formula+ Transmission and Primary Chaincase Lubricant OR Screamin’ Eagle Syn3 Synthetic 20W50)

For engine oil, use any of the following oils. Generally one of the first two is appropriate for most people.

Lowest ambient temperatureOil brandWeight
30 F / -1 CScreamin’ Eagle SYN3 SyntheticSAE 20W50
40 F / 4 CHarley-Davidson H-D 360SAE 20W50
60 F / 16 CHarley-Davidson H-D 360SAE 50
80 F / 27 CHarley-Davidson H-D 360SAE 60
Oil recommendations — Harley-Davidson Milwaukee-Eight

While the standard oil change interval is 5000 miles / 8000 km, H-D recommends you change the oil every 1500 mi / 2400 km if you frequently ride the motorcycle short distances (less than 15 mi / 24 km) in ambient temperatures below 60 degrees F / 16 C. For example, if you’re regularly riding in winter in most of the northern hemisphere, you’ll want to change the oil more often.

Belt Tension Check / Adjustment

To check the belt tension on your FLHR Road King, follow the procedure below.

You need a belt tension tool and a ruler.

  1. Put the motorcycle in neutral on its stand, with the rear wheel on the ground, and nothing in the saddlebags.
  2. Push up on the middle of the bottom half of the belt until the belt tension gauge registers 10 lb (4.5 kg) of pressure.
  3. Use the ruler to measure belt tension

Target belt tension for the FLHR Road King: 3/18-9/16 in / 9.5-14.3 mm

If the belt tension is out of spec, you can either adjust it yourself if you’re familiar with how, or take it to a dealer.

About the 2017+ Harley-Davidson FLHR Road King

2022 FLHR Harley-Davidson Road King static rhs
2022 Harley-Davidson FLHR Road King

The Harley-Davidson FLHR Road King has been a mainstay of Harley-Davidson’s line-up since the 90’s. It’s part of the touring line, and is designed for long-distance travel — in style.

The FLHR Road King is a stripped-back bagger. It doesn’t have a fairing or a rear seat, but it does have bags and a windshield. The core of the Road King is the base 107 c.i. Milwaukee-Eight motor that has been the core engine in the Harley-Davidson tourer line-up since 2017 when it was introduced, replacing the Twin Cam motor of the last generation.

As a premium motorcycle, you might wonder how anyone can call the Road King “stripped back”. How exactly is anything named “king” a modest motorcycle? Well, it becomes more apparent when you compare the Road King with its higher-end stablemates. It doesn’t have a TFT display, it doesn’t have a sound system, and doesn’t have a rear seat for a passenger. Even the fairing is just a windshield, as iconic as it is. The Road King has everything you need for a trip, and nothing more.

The Milwaukee-Eight motor deserves special mention. It’s a long-awaited update to the Twin Cam motor, and brings with it a few welcome improvements that has almost universal praise from the Harley-Davidson riding community. It has all the character of the earlier motor but without the crazy shakiness (thanks to a counter-balancer shaft), and is tuned to be able to make power all the way through the rev range, making for a very rewarding ride.

Riding any motorcycle with the new M8 motor is very rewarding. There’s a big rumble down low, as you’d expect, and a huge wave of torque that is rewarding to rev to 5000 rpm without needing to short-shift as aggressively. As always, there’s passing power in abundance without having to downshift.

The front brakes on the Road King sound impressive — Brembo calipers on twin 300 mm rotors. But these aren’t the same Brembos you’ll find on sport bikes. They work well, but you do need to put effort into them. ABS is optional in the US, though standard in others, and always comes with linked brakes.

Harley-Davidson improved the suspension on their Touring range for 2017 onward. It’s still a Showa dual bending valve unit, but it’s of an improved design that responds much better than the old version, reacting well to big bumps without bottoming out as easily. The new suspension also comes with a remote preload adjuster on the left hand side.

You might also recognise the FLHR as a police motorcycle. It’s a popular choice as a police bike in the USA, ideal as it’s comfortable for all-day riding.

Harley-Davidson also makes the FLHRXS Road King Special, which from 2019 has had a Milwaukee-Eight 114 motor, and has a larger front tire, and slightly different maintenance specs.

Reference — Manual for the Harley-Davidson FLHR Road King (2017+)

The above information came mainly from the maintenance section of the Harley-Davidson Touring manual, with specific adaptations for the Road King (for example, omitting the section about “coolant” — the Road King isn’t liquid-cooled).

You can see the manual for yourself online here (subscription required).

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