09/06/2005
The Harley-Davidson Street Glide ST, or FLHXST, represents a compelling evolution in the touring motorcycle segment, blending classic touring comfort with a dash of sporting intent. Powered by Harley-Davidson's potent Milwaukee-Eight 117 engine, this model offers a significant performance upgrade over its brethren. If you own one of these magnificent machines, understanding its maintenance requirements is crucial to ensuring its longevity and optimal performance. This guide delves into the essential maintenance schedule and practices for your 2022 and onwards Street Glide ST.
- Understanding the Milwaukee-Eight 117 Engine
- Harley-Davidson FLHXST Street Glide ST Service Intervals
- Comprehensive Maintenance Schedule Breakdown
- Standard Inspection Checklist
- Tyre Specifications and Care
- Engine Oil, Primary, and Transmission Lubricants
- Checking and Adjusting Belt Tension
- Performance and Technology Features
- Frequently Asked Questions (FAQs)
Understanding the Milwaukee-Eight 117 Engine
At the heart of the Street Glide ST lies the Milwaukee-Eight 117 motor. This air/oil-cooled, pushrod-operated OHV engine is renowned for its robust power delivery. It features hydraulic, self-adjusting lifters and four valves per cylinder, contributing to its impressive output. With a 10.2:1 compression ratio, the FLHXST produces a formidable 102 hp / 76 kW at 4750 rpm, and a substantial 125 lb-ft / 169 Nm of torque at just 3500 rpm. This represents a notable step up from the Milwaukee-Eight 107 found in the standard Street Glide, offering riders a more exhilarating experience, especially in terms of torque.
The power is transferred to the rear wheel via Harley-Davidson's six-speed "Cruise Drive" transmission, coupled with a reliable belt final drive. This combination ensures smooth gear changes and efficient power transfer, ideal for both highway cruising and spirited riding.
Harley-Davidson FLHXST Street Glide ST Service Intervals
Harley-Davidson motorcycles are known for their relatively straightforward maintenance schedules, and the Street Glide ST is no exception. The general service interval for the FLHXST is every 5,000 miles (8,000 km) or annually, whichever comes first. At each of these service intervals, a series of critical checks and replacements are recommended to keep your bike in peak condition.
These essential tasks include changing the engine oil and filter, inspecting the motorcycle for any components requiring lubrication, adjustment, or cleaning. It's also vital to check wearable items such as hoses and tyres for any signs of degradation or damage.
One of the advantages of the Milwaukee-Eight engine is its self-adjusting valves, which means there's no specific valve adjustment interval. However, Harley-Davidson does recommend replacing the spark plugs every 30,000 miles (48,000 km) or every two years, whichever milestone is reached first. Beyond engine oil, it's crucial to periodically replace the primary chaincase lubricant and the transmission lubricant. Less frequent, but equally important, tasks include changing the brake fluid, typically recommended every two years.
Comprehensive Maintenance Schedule Breakdown
The maintenance schedule for the FLHXST Street Glide ST is designed to cover all essential aspects of the Milwaukee-Eight 117 engine and the motorcycle's overall systems. While the full schedule extends beyond 30,000 miles, the pattern of maintenance items generally repeats. It's important to adhere to the earlier of the time-based or distance-based service intervals. For instance, if you ride less than 5,000 miles in a year, you should still perform the annual service.
Key Maintenance Tasks and Intervals
Here's a detailed look at some of the key maintenance tasks and their recommended intervals:
| Service Item | Interval (Miles) | Interval (Kilometers) | Notes |
|---|---|---|---|
| Every Inspection Checklist | All | All | Refer to Standard Inspection Checklist below |
| Engine Oil & Filter Replacement | 5,000 | 8,000 | Annually, or every 1,500 miles if short trips in cold weather |
| Air Cleaner Filter Inspection | 5,000 | 8,000 | Clean as necessary, more often in severe conditions |
| Spark Plugs Replacement | 30,000 | 48,000 | Every 2 years |
| Spoke Tightness Check (Spoked Rims) | 5,000 | 8,000 | More often in severe conditions |
| Primary Chaincase Lubricant Replacement | 5,000 | 8,000 | More often in severe conditions |
| Transmission Lubricant Replacement | 10,000 | 16,000 | More often in severe conditions |
| Brake Fluid Replacement | N/A | N/A | Every 2 years (DOT 4 fluid) |
| Clutch Fluid Replacement (Hydraulic Clutch Models) | N/A | N/A | Every 2 years (2017-2020 models) |
| Battery Check & Terminal Cleaning | 10,000 | 16,000 | Annually, lubricate terminals |
| Fuel Filter Replacement | 100,000 | 161,000 |
Standard Inspection Checklist
In addition to the scheduled replacements, a thorough inspection is vital. The standard inspection checklist for the Milwaukee-Eight models, including your Street Glide ST, covers a wide range of components to ensure everything is functioning correctly and safely.
This checklist includes items such as:
- Drive belt and sprockets: Inspect for wear and damage.
- Drive belt tension: Check and adjust as necessary.
- Rear sprocket isolators: Inspect at every tyre change.
- Electrical equipment and switches: Verify proper function.
- Tyre pressure and tread (front and rear): Crucial for safety and handling.
- Brake and clutch controls: Lubricate for smooth operation.
- Brake pads: Check for wear; minimum thickness is 0.4 mm / 0.016 in.
- Brake fluid level and moisture content: Inspect level and replace if moisture exceeds 3%.
- Clutch cable: Adjust and check for leaks or abrasion; lubricate as needed.
- Oil cooler: Clean to maintain efficient cooling.
- Oil and brake lines: Inspect for any leaks or damage.
- Jiffy stand: Lubricate for smooth operation.
- Exhaust system, fasteners, and shields: Check for tightness and integrity.
- Fuel door hinge and latch: Lubricate.
- Component and system function: A road test to confirm overall performance.
Tyre Specifications and Care
The Street Glide ST typically comes equipped with custom-made Dunlop bias blackwall tyres. Maintaining the correct tyre pressure is paramount for safety, handling, and tyre longevity. For the FLHXST, the recommended cold tyre pressures are:
| Wheel | Tyre Size | Tyre 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 |
Regularly check your tyre pressure, especially before long rides. Inspect tyres for wear, damage, and proper tread depth.
Engine Oil, Primary, and Transmission Lubricants
As mentioned, there are three key fluid reservoirs to manage on your Street Glide ST:
- Engine Oil: The standard interval is 5,000 miles, but Harley-Davidson advises changing it every 1,500 miles if you frequently undertake short trips (under 15 miles) in temperatures below 60°F (16°C). This is particularly relevant for riders in cooler climates or those using their bike for commuting in colder months.
- Primary Chaincase Lubricant: This protects the clutch and primary drive components.
- Transmission Lubricant: Ensures smooth gear changes and protects the gearbox.
For all these fluids, recommended lubricants include Castrol V-Twin 20W50, Mobil 1 V-twin 20W-50, or Harley-Davidson's own Screamin' Eagle Syn3 Synthetic 20W50. Always consult your owner's manual for the precise specifications and capacities.
Checking and Adjusting Belt Tension
The drive belt tension is critical for the longevity of the belt, sprockets, and wheel bearings. To check the belt tension on your FLHXST:
- Ensure the motorcycle is in neutral, on its stand, with the rear wheel on the ground and no weight in the saddlebags.
- Using a belt tension gauge and a ruler, apply 10 lb (4.5 kg) of pressure to the middle of the bottom run of the belt.
- Measure the belt deflection. The target belt tension for the FLHXST Street Glide ST is between 3/8-9/16 inch (9.5-14.3 mm).
It's important to note that the belt tension specification for the FLHXST may differ from other Harley-Davidson models due to variations in suspension components. If the belt tension is outside the specified range, it should be adjusted by a qualified technician or by following the procedure in your owner's manual if you are comfortable performing the task.
Performance and Technology Features
The Street Glide ST is more than just a powerful touring machine; it's a performance bagger equipped with advanced technology. The Showa Dual Bending Valve forks at the front and upgraded rear shocks contribute to a more refined ride. The bike offers a decent lean angle of 32 degrees to the right and 31 degrees to the left, though its length and weight mean that leaning it aggressively can lead to components touching down.
The dash features a modern touch-screen display integrated with the "Boom! Box" infotainment system and a twin-speaker setup, alongside classic analogue gauges. The braking system comprises twin 300mm rotors with 4-piston calipers, featuring standard ABS and linked braking.
A significant technological advantage is the optional "Cornering Rider Safety Enhancements" package, also known as Reflex Defensive Rider Systems. This suite, utilizing a six-axis IMU, enhances cornering ABS, traction control, and allows for control via ride modes, providing an extra layer of safety and confidence when riding.
Frequently Asked Questions (FAQs)
Q1: How often should I change the oil on my Street Glide ST?
A1: The standard interval is every 5,000 miles or annually. However, for frequent short trips in cold weather (below 60°F), Harley-Davidson recommends changing it every 1,500 miles.
Q2: What type of oil should I use?
A2: You can use Harley-Davidson's recommended 20W-50 oils, such as Castrol V-Twin 20W50, Mobil 1 V-twin 20W-50, or Screamin' Eagle Syn3 Synthetic 20W50. Always refer to your owner's manual for the exact specifications.
Q3: What is the correct belt tension for my Street Glide ST?
A3: The correct belt tension is between 3/8-9/16 inch (9.5-14.3 mm) deflection when 10 lb of pressure is applied to the middle of the lower belt run.
Q4: Do I need to adjust the valves on my bike?
A4: No, the Milwaukee-Eight engine features self-adjusting valves, so manual adjustment is not required.
Regular and diligent maintenance is key to enjoying your Harley-Davidson Street Glide ST for years to come. By following this guide and consulting your owner's manual, you can ensure your ride remains a powerful and reliable companion on all your journeys.
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