Harley-Davidson FLHXST Street Glide ST (2022+) Maintenance Guide
This is the maintenance schedule and guide for the 2022+ Harley-Davidson Street Glide ST, code name FLHXST. It’s the high-performance upgrade to the Harley-Davidson FLHXS Street Glide Special.
The Street Glide ST is a new concept for Harley Davidson. It’s a touring bike with (somewhat) sporting intentions, powered by Harley-Davidson’s most powerful air/oil-cooled motor, and with a slightly sleeker look than the base model FLHX Street Glide.
The FLHXST Street Glide ST is powered by the Milwaukee-Eight 117 motor, an air/oil-cooled pushrod-operated OHV motor with hydraulic, self-adjusting lifters, and four valves per cylinder. With its 10.2:1 compression ratio, the FLHXST makes peak power of 102 hp / 76 kW at 4750 rpm, and peak torque of 125 lb-ft / 169 Nm at 3500 rpm.
The 117 is a distinct upgrade over the Milwaukee-Eight 107 in the base-model Harley-Davidson FLHX Street Glide, though the 107 was never considered to be short on torque.
The final drive is via Harley-Davidson’s six-speed “Cruise Drive” and a belt rear.
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Harley-Davidson FLHXST Street Glide ST Service Intervals
Like most Harley-Davidson motorcycles, the Harley-Davidson FLHXST Street Glide ST has 5000 mile / 8000 km or annual service intervals.
At every service, you need to 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 FLHXST has self-adjusting valves, there is no valve service interval. However, Harley-Davidson does suggest you change the spark plugs every 30000 miles / 48000 km or two years.
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 FLHXST Street Glide ST (2012+) Maintenance Schedule
Below is the maintenance schedule for the FLHXST Street Glide ST. The Street Glide ST’s maintenance schedule is that of the Milwaukee-Eight 117 motor without the twin cooling seen in some high-end Touring models.
The schedule is broken up into the standard maintenance schedule of major items and the inspection checklist of regular service items.
Maintenance Schedule
Below is the maintenance schedule for the Harley-Davidson FLHXST Street Glide ST .
Notes:
- To make the maintenance schedule more legible, we’ve cropped it at 30000 miles / 48000 km. Keep repeating it in the pattern shown, with some items only done irregularly.
- Follow the earlier of time-based or distance-based service intervals. For example, change the oil every 5000 miles or year, whichever comes sooner.
| mi x 1000 | 1 | 5 | 10 | 15 | 20 | 25 | 30 | |
|---|---|---|---|---|---|---|---|---|
| km x 1000 | 1.6 | 8 | 16 | 24 | 32 | 40 | 48 | Every |
| Inspection checklist (see below) – Perform | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | Year (some items only) |
| Engine oil – Replace | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | Year See notes below |
| Oil filter – Replace | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | Year |
| Air cleaner filter – Inspect Clean as necessary in lukewarm water with mild detergent | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | More often if riding in severe conditions. | |
| Spark plugs – Replace | ✓ | 2 years | ||||||
| (Spoked rims) Spoke tightness (front and rear) – Check | ✓ | ✓ | ✓ | More often if riding in severe conditions. | ||||
| Hand control switch housing screw torque – Tighten | ✓ | ✓ | ✓ | ✓ | Year | |||
| Front brake handlebar clamp screw torque – Tighten | ✓ | ✓ | ✓ | ✓ | Year | |||
| Steering head bearings – Lubricate | ✓ | |||||||
| Windshield bushings – Inspect | ✓ | ✓ | ✓ | |||||
| Primary chaincase lubricant – Replace | ✓ | ✓ | ✓ | ✓ | More often if riding in severe conditions. | |||
| Transmission lubricant – Replace | ✓ | ✓ | More often if riding in severe conditions. | |||||
| Brake systems – Replace (use DOT 4 fluid) | 2 years | |||||||
| (2017-2020 Hydraulic clutch models) Clutch fluid – Replace | 2 years | |||||||
| Front and rear axle nut torque – Tighten | ✓ | ✓ | ✓ | ✓ | Year | |||
| 12 battery – Check battery, terminal torque, and clean connections. Lubricate with electrical contact lubricant | Year | |||||||
| Fuel filter – Replace | 100000 mi (161000 km) |
Standard Inspection Checklist
Below is the standard inspection checklist for the Street Glide ST. Perform the items in this checklist per the schedule above.
Not all items need to be checked annually — those that have annual service requirements are marked on the right.
| Standard Inspection Checklist — Milwaukee Eight (2021+) | Annual |
|---|---|
| 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%. | |
| 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 |
Wheel / Tire Size
The Street Glide ST ships with Dunlop bias blackwall tires, custom made for Harley-Davidson.
| Wheel | Wheel size | Tire size | Tire pressure (cold) |
|---|---|---|---|
| Front | 19 x 3.5 in | 130/60B19 61H | 36 psi / 248 kPa |
| Rear | 18 x 5 in | 180/55B18 80H | 40 psi / 276 kPa |
Oil Change on the FLHXST Street Glide ST
There are three fluids that need to be changed on the Street Glide ST, as with most Harley-Davidsons.
For all of them, you can use Castrol V-Twin 20W50, a popular oil for Harley-Davidson big twins, or Mobil 1 V-twin 20W-50. You can also use Screamin’ Eagle Syn3 Synthetic 20W50, Harley-Davidson’s own in-house high-quality synthetic, which you can get from dealers.
These are the places oil needs to be changed:
- Engine oil
- Primary chaincase
- Transmission
While the standard oil change interval for the Street Glide ST is 5000 miles / 8000 km, Harley-Davidson 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 FLHXST Street Glide ST, follow the procedure below.
You need a belt tension tool (either Harley-Davidson or aftermarket one, as most belt tension tools are similar) and a ruler to measure belt deflection
- Put your bike in neutral on its stand, with the rear wheel on the ground, and nothing in the saddlebags.
- 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.
- Use the ruler to measure belt tension.
Target belt tension for the FLHXST Street Glide ST: 3/8-9/16 inch (9.5-14.3 mm)
Note that the belt tension spec for the FLHXST Street Glide ST is different from that of the standard Street Glide due to different suspension components.
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 Harley-Davidson Street Glide ST (FLHXST)
The Harley-Davidson Street Glide ST is the latest iteration of the legendary Street Glide, the Harley-Davidson touring motorcycle that’s one of its most popular models.
The core of the Street Glide ST is the 117 c.i. Milwaukee-Eight that until recently was the exclusive domain of some of the CVO models. It’s a stomper of a motor, with significantly more torque over the 114, thanks to a high-performance cam, tuned exhaust, and custom Screamin’ Eagle intake.
The Street Glide ST is a touring bike, but more specifically, it’s a performance bagger. This is an emerging class of motorcycles, one that has always been popular on the sly, but that has become more and more so thanks to the King of the Baggers racing series. It seems oxymoronic. Why would you make a racing class for a type of motorcycle designed to take luggage over long distances? For the same reason anyone creates any racing classes: because it’s fun. And because it sells bikes.
Aside from the motor, there are other aspects of the Street Glide ST that are performance oriented. At the front, Showa Dual Bending Valve forks suspend the wheel, though there’s no adjustability to them. And at the rear, Harley-Davidson has upgraded the shocks, smoothing out the ride somewhat over harsh pavement — although low suspension will always be a bit rough.
The net effect of the performance suspension is decent lean of 32 degrees to the right and 31 to the left. Of course, the Street Glide ST is so long and heavy that you really have to lean it to get it around corners, which means you drag parts quite quickly.
One differentiator over the base model tourer, the Road King Special, is that the Street Glide has quite an advanced dash. There’s a touch-screen display, and a twin speaker system (the “Boom! Box” infotainment system). There are still gauges though, for the classic motorcycling look and feel.
The Street Glide has twin 300mm rotors and 4-piston calipers, with standard ABS and linked braking.
The Street Glide ST also comes with optional advanced ride aids, Harley-Davidson’s “Cornering Rider Safety Enhancements” package, also known as Reflex Defensive Rider Systems. It’s a six-axis IMU that informs cornering ABS, traction control, and is controllable via ride modes. Only Harley-Davidson’s Touring range comes with this optional (though it’s standard on some CVO models and their modern liquid-cooled bikes), so this is a special feature.
Reference — Manual Screenshots for the Street Glide ST
The above information came largely from the manual for the Harley-Davidson Touring motorcycles, with reference to other Harley-Davidson parts and resource pages.
You can get manuals for Harley-Davidson motorcycles directly from Harley-Davidson here.
