Quick Analysis
Harley Davidson Fat Boy
22.0 pts
Unweighted: 19 advantages
EnginePerformanceDimensionsBrakesTyresFeaturesOther
KTM 85 SX
10.0 pts
Unweighted: 4 advantages
EnginePerformanceDimensionsBrakesTyresFeaturesOther
| Specification | ||
|---|---|---|
Engine Specifications |
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| Cooling System | Air-cooled | Liquid Cooled |
| Displacement | 1,923 cc | 84.9 cc |
| Engine Type | Milwaukee-Eight™ 117 Custom | 1-cylinder, 2-stroke engine |
| Power | 103 HP / 77 kW @ 5020 rpm | 15.5 bhp @ 11500 rpm |
| Torque | 168 Nm @ 3000 rpm | 14 Nm @ 8500 rpm |
Performance & Efficiency |
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| Fuel Tank Capacity | 18.9 litres | 5.2 L |
| Mileage | 18.18 Kmpl | 25 kmpl |
Dimensions & Weight |
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| Kerb Weight | 315 | approx. 67 kg (without fuel) |
| Seat Height | 675 | 865 mm |
Brakes & Suspension |
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| ABS | Dual-channel ABS | — |
| Front Brake | Disc | Disc 240 mm |
| Front Suspension | Dual-bending valve 49 mm telescopic with aluminum fork triple clamps, dual rate spring | XACT 43 WP Upside-Down fork, Ø 43 mm |
| Rear Brake | Disc | Disc 220 mm |
| Rear Suspension | Hidden, free piston, coil-over monoshock; 43mm stroke, hydraulic preload adjustment | XACT WP PDS mono shock |
Tyres & Wheels |
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| Front Tyre | 160/60 R18 | 70/100 - 17 |
| Rear Tyre | 240/40 R18 | 90/100 - 14 |
| Tyre Type | Tubeless | Tubed |
| Wheel Type | Cast aluminum (Lakester) | Spoke |
Features & Technology |
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| Headlight | LED | — |
Other Specifications |
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| Bike Image 1 | https://motoautiv.com/wp-content/uploads/2025/06/Blue.avif | — |
| Bike Image 2 | https://motoautiv.com/wp-content/uploads/2025/06/Grey.avif | — |
| Bike Image 3 | https://motoautiv.com/wp-content/uploads/2025/06/Whiskey-fire.avif | — |
| Cluster | Analog with LCD | — |
| Color Options | Billiard Gray | #6B7074 Vivid Black | #0F0F10 Blue Burst | #1E4D8C Whiskey Fire / Vivid Black | #7A2D1B, #0F0F10 | Orange | #F2771A |
| Cons | The Weight Is Impossible to Ignore – Parking, reversing, or making tight U-turns requires more effort than on most motorcycles. The bike feels considerably lighter once moving, but the weight is always present at low speeds. Not a Motorcycle That Enjoys Tight Corners – The Fat Boy is happiest on flowing roads. When the road becomes tight and twisty, its size and geometry become more noticeable. Wind Hits You Directly at Highway Speeds – Without a fairing or windscreen, long highway rides can become tiring because the rider takes the full force of the wind. Can Feel Warm in Traffic – Sitting in slow-moving traffic on a hot day makes the large V-twin's heat more noticeable around the legs. Passenger Comfort Is Average – The stock setup feels more focused on the rider. For frequent two-up riding, many owners look at accessory seats and backrests. Not Built Around Practicality – There is no meaningful storage space, and carrying luggage usually requires additional accessories. Running Costs Are Higher Than Average – Tyres, servicing, insurance, and genuine accessories can all add up compared to smaller motorcycles. Requires Some Experience to Get the Best Out of It – The combination of weight, engine size, and physical dimensions can feel intimidating for riders who are new to large-capacity cruisers. Floorboards Touch Down Earlier Than You Might Expect – Riders who push harder through corners will eventually find the limits of the cruiser-style setup. | Not road legal and suitable only for off-road tracks. High maintenance due to 2-stroke engine rebuilds. Kick-start only, no electric start option. Relatively expensive compared to other youth dirt bikes. Small fuel tank limits long riding sessions. |
| Detailed Overview | Even among Harley-Davidson’s own motorcycles, the Fat Boy has always been difficult to mistake for anything else. The solid-disc Lakester wheels, broad fuel tank, chunky tyres, and low stance give it a silhouette that looks substantial from every angle. While many cruisers rely on chrome and visual complexity to create an impression, the Fat Boy’s design is built around simple, oversized elements that have remained part of its identity for decades. The motorcycle is based on Harley-Davidson’s Softail platform, which uses a hidden rear suspension arrangement beneath the seat area. From the side, the frame still resembles the rigid hardtail cruisers that inspired it, but underneath there is a modern monoshock setup responsible for absorbing road imperfections. The front suspension uses telescopic forks designed to support the motorcycle’s considerable weight while maintaining stability over varying road surfaces. A 1,923cc Milwaukee-Eight 117 V-twin engine sits prominently in the center of the motorcycle. Rather than encouraging riders to explore the upper reaches of the rev range, the engine develops much of its performance lower down, which influences how the Fat Boy behaves in everyday riding. The motorcycle can accelerate with relatively little throttle input, and the six-speed gearbox allows the engine to remain relaxed during highway travel. The large displacement and V-twin configuration are also major contributors to the motorcycle’s mechanical character and riding feel. Dimensionally, the Fat Boy is a substantial machine. Wide tyres at both ends, a long wheelbase, and a low seat height all contribute to its proportions. The low seating position places the rider close to the ground, while forward-mounted foot controls create the stretched riding posture commonly associated with large American cruisers. Combined with the wide handlebar, the rider’s position is very different from what would be experienced on a roadster or sport motorcycle. The Lakester wheels remain one of the defining visual features of the Fat Boy. Unlike conventional alloy wheels, their solid-disc-inspired design creates a unique appearance that has become closely associated with the model over the years. Alongside the broad tyres and muscular bodywork, these wheels play a significant role in shaping the motorcycle’s overall identity. Technology is present, although it is integrated more discreetly than on Harley-Davidson’s touring motorcycles. Modern versions include selectable riding modes, traction control, and ABS, with certain markets also receiving cornering-sensitive rider-assistance systems. Instead of a large touchscreen display, the Fat Boy uses a compact instrument setup focused primarily on essential riding information. An 18.9-litre fuel tank sits above the engine and forms one of the largest visual elements of the motorcycle. Lighting throughout the motorcycle uses LED technology, while the overall design remains intentionally uncluttered. There are few body panels, minimal visual distractions, and a clear emphasis on exposing the mechanical components that define the motorcycle. The Fat Boy’s specifications reveal a motorcycle shaped around traditional cruiser principles: a large-capacity V-twin engine, long-wheelbase chassis, low seating position, and substantial physical presence. Although modern electronics and engineering have been incorporated over time, the underlying layout remains closely tied to the formula that has defined the model for decades. | The KTM 85 SX is one of the most popular and respected youth motocross bikes in the world, designed specifically for young riders who are ready to take the next big step toward competitive racing. More than just a beginner’s off-road bike, the 85 SX brings true race-bred DNA from KTM’s full-size SX lineup, giving upcoming racers the opportunity to experience high-level performance at an early age. With its sharp power delivery, lightweight design, and premium components, the bike is built to help young riders improve skills and confidently tackle motocross tracks. At the heart of the KTM 85 SX lies its 84.9cc 2-stroke, liquid-cooled engine, which is known for delivering punchy power and rapid acceleration. The powervalve system ensures that the engine produces strong torque across the rev range, making the bike easier to control while still offering impressive performance. Whether riders are attacking tight corners or hitting long straights, the engine responds crisply and delivers the thrilling character 2-strokes are known for. Paired with a 6-speed gearbox, the bike offers smooth shifting and plenty of flexibility for both beginners and experienced youth racers. One of the standout features of the 85 SX is its lightweight chassis, made with high-strength chromoly steel. This frame not only enhances stability but also ensures precise handling, allowing riders to maneuver confidently through jumps, whoops, and rough terrain. The ergonomics are thoughtfully designed to fit young riders, offering a slim body that allows easy movement, better grip, and improved control during aggressive riding. Suspension is another area where KTM excels, and the 85 SX is no exception. It comes equipped with WP XACT suspension, featuring an AER air fork at the front and a fully adjustable shock absorber at the rear. This setup provides excellent damping, great response on jumps, and impressive support on uneven surfaces. Riders can also fine-tune the suspension to match their weight, riding style, and track conditions — something rarely seen in youth motocross bikes. The bike also features powerful disc brakes on both ends, giving young riders the confidence to brake hard into corners. The wave-style discs help with heat dissipation, which is especially important during long practice sessions or competitive races. Lightweight wheels, grippy motocross tyres, and a race-focused design further enhance the overall performance package. In terms of ergonomics, the KTM 85 SX is designed to feel like a miniature version of the bigger SX bikes. The seat height, handlebar position, and narrow bodywork all work together to provide comfort while promoting proper riding posture. This allows young riders to develop good habits early in their riding journey. Overall, the KTM 85 SX is a bike built for serious young racers who want real performance, durability, and race-ready features. With its responsive engine, excellent suspension, strong brakes, and lightweight build, it stands out as one of the top choices in the youth motocross segment. Whether used for training or competition, the 85 SX gives riders a true taste of professional motocross performance. |
| Expert Review | The Fat Boy has always been a motorcycle that prioritizes presence as much as performance. Even by cruiser standards, it feels substantial, whether you're looking at it parked or riding it down the road. The Milwaukee-Eight 117 engine suits the character of the bike perfectly, producing the kind of effortless torque that allows you to ride without constantly thinking about gear selection or engine speed. What stands out most is how planted the motorcycle feels once it's moving. The wide tyres, long wheelbase, and considerable weight create a sense of stability that encourages a relaxed riding style rather than an aggressive one. At the same time, those same traits mean the Fat Boy asks for a bit more effort in slow-speed situations and doesn't feel particularly eager when the road becomes tight and technical. The riding experience is less about chasing performance figures and more about the way the motorcycle delivers its power, carries its weight, and settles into a steady rhythm on open roads. Modern electronics have improved safety and usability, but they remain secondary to the traditional cruiser character that continues to define the Fat Boy., 4.4, MotoAutiv Team | The KTM 85 SX is a small motocross bike built mainly for young riders who are moving up from smaller machines. It uses an 85cc two-stroke engine that feels quick and lively, especially in the mid to high rev range, but it does require regular gear shifting to keep it in the power band. The lightweight frame and compact size make it easy to handle on dirt tracks, and it feels agile while taking corners or jumps. The suspension setup is firm and designed for racing conditions, so it works well on rough tracks but can feel a bit stiff on slower or uneven surfaces. Braking performance is sharp and responsive, which helps in controlling speed during aggressive riding. Since it is a performance-focused dirt bike, it needs frequent maintenance compared to regular bikes, especially because of the two-stroke engine. Overall, the KTM 85 SX is focused on track use, with a strong emphasis on performance, handling, and control for riders who are still developing their skills., 4.0, MotoAutiv Team |
| FAQ (Manual Override) | Q: What type of motorcycle is the Harley-Davidson Fat Boy? A: The Fat Boy is classified as a heavyweight cruiser motorcycle, designed around relaxed riding ergonomics, a large V-twin engine, and long-distance road comfort. Q: Which engine powers the Fat Boy? A: The latest model uses the Milwaukee-Eight 117 V-twin engine paired with a 6-speed gearbox. Q: Is the Fat Boy suitable for long-distance rides? A: Yes. The relaxed ergonomics and torque-rich engine make it capable of covering long distances, although many owners add touring accessories for greater comfort. Q: What is the seat height of the Fat Boy? A: The seat height is approximately 675 mm, making it accessible to a wide range of riders. Q: Does the Fat Boy have cruise control? A: Availability depends on market and model year. Some versions include cruise control, while others may offer it as an accessory. Q: What is the fuel tank capacity of the Fat Boy? A: The motorcycle is equipped with an 18.9-litre fuel tank. Q: Does the Fat Boy have riding modes? A: Yes. Modern versions include selectable riding modes and electronic rider-assistance systems. Q: Is the Fat Boy comfortable for a passenger? A: Occasional two-up riding is possible, but the stock setup is more rider-focused than dedicated touring motorcycles. Q: How is the Fat Boy different from the Breakout? A: The Fat Boy focuses on a broad, muscular cruiser character with solid-disc wheels, while the Breakout adopts a stretched custom-cruiser design with a much wider rear tyre. Q: Does the Fat Boy have traction control and ABS? A: Yes. Modern versions include ABS, traction control, and other rider-assistance technologies. Q: What is the kerb weight of the Harley-Davidson Fat Boy? A: The motorcycle weighs approximately 315 kg in running condition, depending on market specification. Q: Is the Fat Boy beginner-friendly? A: The low seat height helps with accessibility, but the weight, engine size, and overall dimensions make it better suited to riders with some experience. Q: Does the Fat Boy support smartphone connectivity? A: The Fat Boy uses a relatively simple instrumentation setup compared to Harley's touring models, so smartphone integration is limited. Q: What body type does the Fat Boy belong to? A: It is categorized as a cruiser motorcycle, specifically a heavyweight cruiser designed around comfort, torque delivery, and road presence. | Q: What is the mileage? A: The mileage is around 18–20 kmpl (may vary as it’s an off-road motocross bike). Q: Is the KTM 85 SX road legal? A: No, it is a pure motocross bike meant only for off-road track use and cannot be registered for road riding. Q: What type of engine does the KTM 85 SX have? A: It uses an 85cc, liquid-cooled, two-stroke engine. Q: Is the KTM 85 SX suitable for beginners? A: It is better suited for young riders who already have some riding experience, as the power delivery can feel aggressive for complete beginners. Q: Does the KTM 85 SX require high maintenance? A: Yes, like most two-stroke motocross bikes, it requires frequent maintenance such as piston checks, air filter cleaning, and regular servicing. Q: What is the fuel type used in KTM 85 SX? A: It runs on petrol mixed with two-stroke oil, not plain petrol. Q: How many gears does the KTM 85 SX have? A: It comes with a 6-speed gearbox. Q: Can the KTM 85 SX be used for daily commuting? A: No, it is not designed for daily use, comfort, or long rides, and lacks features needed for regular road riding. Q: What age group is the KTM 85 SX designed for? A: It is typically designed for young riders, usually between 11 to 15 years old, depending on height and experience. Q: Does it have electric start? A: No, it uses a kick-start mechanism. Q: What kind of riding is the KTM 85 SX best for? A: It is best suited for motocross tracks, jumps, and competitive off-road riding rather than trails or city roads. |
| Fuel System | Fuel Injection | Keihin PWK 28 |
| Price Variants | STD | 2803000 | STD | 669000 |
| Pros | Instantly Recognizable Design – Few motorcycles are as easy to identify from a distance as the Fat Boy. The solid-disc wheels, wide stance, and muscular proportions give it a presence that stands out even among other cruisers. Torque-Rich Engine Character – The Milwaukee-Eight 117 doesn't need to be revved hard to make progress. A small twist of the throttle is usually enough to get the bike moving with very little effort. Relaxed Riding Position – The low seat, wide handlebar, and stretched-out foot controls create a laid-back riding posture that suits cruising and long hours in the saddle. Feels Stable on Open Roads – Once the bike is moving, its weight starts working in its favour. It feels planted at highway speeds and doesn't get unsettled easily. High-Quality Finish – From the paintwork to the chrome detailing and metal components, the overall fit and finish reflects the premium nature of the motorcycle. Low Seat Height Helps at Stops – Despite being a large motorcycle, the low seat makes it easier for many riders to place both feet firmly on the ground. Modern Electronics Without Changing the Character – Features such as ABS, traction control, and riding modes work in the background without taking away from the traditional cruiser feel. Comfortable Engine for Cruising – The engine settles into a relaxed rhythm at highway speeds and rarely feels stressed during normal riding. | Powerful 2-stroke engine with strong mid-range performance. Lightweight chassis for excellent handling on tracks. Premium WP suspension for smooth jumps and rough terrain. Strong disc brakes offering sharp stopping power. Race-ready ergonomics designed for young motocross riders. |
| Starter | Electric | Kickstarter |
| Transmission | 6-speed manual | 6 Speed Manual |
