Quick Analysis
KTM 85 SX
13.0 pts
Unweighted: 7 advantages
EnginePerformanceDimensionsBrakesTyresFeaturesOther
KTM 350 EXC-F SIX DAYS
21.5 pts
Unweighted: 15 advantages
EnginePerformanceDimensionsBrakesTyresFeaturesOther
| Specification | ||
|---|---|---|
Engine Specifications |
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| Cooling System | Liquid cooling (0.8L) | — |
| Displacement | 84.9 cc | 349.7 cc |
| Engine Type | 1-cylinder, 2-stroke engine | 1-cylinder, 4-stroke engine |
| Power | 15.5 bhp @ 11500 rpm | 44.3 bhp @ 9500 rpm |
| Torque | 14 Nm @ 8500 rpm | 36 Nm @ 7000 rpm |
Performance & Efficiency |
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| Fuel Tank Capacity | 5.2 L | 8.5 L |
| Mileage | 25 kmpl | 25 kmpl |
Dimensions & Weight |
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| Kerb Weight | approx. 67 kg (without fuel) | 107 kg |
| Seat Height | 865 mm | 963 mm |
Brakes & Suspension |
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| ABS | — | Dual Channel ABS |
| Front Brake | Disc 240 mm | Disc 220 mm |
| Front Suspension | XACT 43 WP Upside-Down fork, Ø 43 mm | WP XACT-USD, Ø 48 mm |
| Rear Brake | Disc 220 mm | Disc 220 mm |
| Rear Suspension | XACT WP PDS mono shock | WP XPLOR shock absorber with PDS |
Tyres & Wheels |
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| Front Tyre | 70/100 - 17 | 90/90 - 21 |
| Rear Tyre | 90/100 - 14 | 140/80 - 18 |
| Tyre Type | Tubed | Tubed |
| Wheel Type | Spoke | Spoke |
Features & Technology |
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| Headlight | — | LED headlight |
Other Specifications |
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| Battery | — | 12.8V 2Ah |
| Color Options | Orange | Metallic Whhite |
| Cons | 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. | High purchase cost: As a premium “Six Days” edition, it’s more expensive than standard enduro bikes. Tall seat height: Around 963 mm, which can be difficult for shorter or less‑experienced riders. Small-ish fuel tank (~8.5 L), which may limit range in very long or remote enduro rides. Maintenance-intensive: High-performance components (valves, clutch, engine) need frequent checks and servicing. Can feel “stiff” for casual riders: The race-tuned suspension and aggressive setup may not be comfortable for easy trail riding. Reliability concerns: Some users report fueling issues (lean running), and need for aftermarket ECU or tuning. > “Bad fueling – running too lean … Most people … want a fuel tuner or aftermarket ECU.” Battery dependency: Electric start depends on the lightweight battery — if it fails, starting could be problematic. |
| Detailed Overview | 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. | The KTM 350 EXC-F Six Days is a premium, race-oriented version of KTM’s 350cc enduro bike, designed to deliver top-tier performance for serious off-road riders who demand both power and endurance. Constructed with high-quality components and Six Days–specific upgrades, this model embodies KTM’s racing legacy while remaining practical enough for hard enduro, cross-country, and competition-style riding. At its heart, the Six Days version uses a 349.7 cc single-cylinder, 4-stroke, DOHC engine. The engine features a Keihin EFI system with a 42 mm throttle body for precise fuel delivery and efficient performance. A wet, multi-disc DDS clutch with Brembo hydraulics gives smooth yet reliable clutch control, while the 6-speed gearbox offers a wide range of ratios to tackle technical terrain and high-speed sections. Powerplant design also focuses on minimizing friction and centralizing mass — the engine is slightly tilted backward for a low center of gravity and better balance. For starting, the bike uses an electric starter powered by a lightweight 2 Ah lithium-ion battery. This setup ensures reliable starts and helps reduce overall weight. The wiring harness is smartly tucked under the seat to keep things clean and accessible. The chassis is built from 25CrMo4 chromoly steel in a double-cradle design, giving it the right mix of strength and flex for rugged terrain. The sub-frame is a two-part construction made from reinforced aluminum and polyamide, designed to flex under stress instead of breaking. To maintain stability, the Six Days has CNC-machined triple clamps and a forged steering head — these contribute to strong rigidity and precise handling, even at high speed or on demanding trails. Suspension is a standout: up front, there’s a 48 mm WP XACT upside-down fork with fully adjustable compression and rebound. At the back, a WP XPLOR PDS shock offers tool-free hand-adjustable dual compression clickers, making it easy to tune on the fly. Suspension travel is generous — 300 mm at the front and 310 mm at the rear — helping the bike soak up big hits, jumps, and rough terrain. The Six Days edition also comes fitted with GIANT alloy wheels (1.60×21″ front, 2.15×18″ rear) and high-traction Metzeler 6 Days Extreme tires, tailored for grippy performance in a variety of off-road conditions. Braking is handled by large discs — 260 mm at the front and 220 mm at the rear — providing reliable stopping power. In terms of ergonomics, the seat height is 963 mm, which suits taller or more experienced riders, and ground clearance is a generous 347 mm, helping clear obstacles easily. The fuel tank has a capacity of about 8.5 liters, made from transparent XPE material so you can easily see fuel level, and it’s designed for durability and low weight. KTM has also included modern rider aids: there’s a Map Select switch which lets riders toggle between different engine maps for varied terrain, and traction control (MTC) helps maintain grip when things get slippery. Optionally, there’s also a quick-shifter for clutchless upshifts (2nd to 6th gear), which is particularly useful for racing or long enduro stages. Durability is a big focus. The Six Days version includes factory protection like reinforced plastics, and the frame and subframe are built to resist stress and flex intelligently. The exhaust is compact and routed close to the engine for better mass centralization and protection. Overall, the KTM 350 EXC-F Six Days blends race-grade performance with thoughtful off-road capability. It’s a bike built for enduro warriors who want a powerful, agile, and durable machine — perfect for demanding multi-day events or serious trail riding. |
| Expert Review | MotoAutiv Team | MotoAutiv Team |
| FAQ (Manual Override) | Q: What is the mileage? A: The mileage is around 18–20 kmpl (may vary as it’s an off-road motocross bike). Q: What is the engine capacity? A: The KTM 85 SX comes with an 84.9 cc 2-stroke engine. Q: What is the seat height? A: The seat height is approximately 850 mm. Q: What is the top speed? A: The top speed is around 110 km/h, depending on rider and terrain. Q: Does the KTM 85 SX have electric start? A: No, it comes with a kick-start mechanism. Q: What is the fuel tank capacity? A: The fuel tank capacity is 5.2 liters. Q: Is the KTM 85 SX road legal? A: No, it is not road legal as it is designed specifically for motocross/off-road racing. Q: What type of brakes does it have? A: It features disc brakes at both front and rear. Q: Is the KTM 85 SX suitable for beginners? A: It is ideal for youth riders transitioning to higher-powered bikes, but not recommended for complete beginners. Q: What is the weight of the bike? A: The bike weighs approximately 68 kg (dry weight). | Q: What engine does the KTM 350 EXC‑F SIX DAYS have? A: It has a 349.7 cc, single-cylinder, 4-stroke engine. Q: What type of fuel injection does it use? A: It uses Keihin EFI with a 42 mm throttle body. Q: What is the transmission setup? A: The bike has a 6-speed gearbox. Q: What kind of clutch does it have? A: It uses a wet, multi‑disc DDS clutch with Brembo hydraulics. Q: Is it electric start or kick start? A: It has an electric starter powered by a lightweight 2 Ah lithium‑ion battery. Q: What suspension does it use? A: • Front: WP XACT upside-down fork (48 mm) • Rear: WP XPLOR shock with PDS design Q: What is the seat height? A: The seat height is 963 mm. Q: What is the ground clearance? A: Ground clearance is 347 mm according to KTM specs. Q: What is the fuel tank capacity? A: It holds about 8.5 liters of fuel. Q: What is the weight (without fuel)? A: The kerb / dry weight is around 107 kg. Q: What brakes does it have? A: • Front: Disc brake • Rear: Disc brake Q: Does it have any rider aids? A: Yes — it comes with traction control (MTC). Also, it has a quick-shifter for upshifts, which is standard on the Six Days version. Q: Can you change the fuel mapping? A: Yes — there is a map‑select switch that lets you toggle between maps. Q: What’s special about the Six Days edition? A: Some Six Days‑specific features include: CNC-machined orange triple clamps Six Days-branded parts and graphics Metzeler 6 DAYS Extreme tires for off-road grip. Q: How easy is it to adjust the suspension? A: Very easy — both front and rear suspension have tool-free adjustment: Rear PDS uses hand‑adjustable dual compression clickers Front forks have clickers on top and bottom for compression and rebound tuning. |
| Price Variants | | 669000 | | 1295800 |
| Pros | 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. | Very good power-to-weight ratio — compact 350 cc engine + light chassis gives strong performance. Highly adjustable suspension: 48 mm WP XACT fork + WP XPLOR PDS shock, both with tool-free tuning. High-end factory parts: CNC-machined triple clamps, Six Days‑specific styling and components. Electric start with a lightweight lithium-ion battery makes it easier to start in remote locations. Quickshifter included for clutchless upshifts (2nd–6th gear) — great for racing or long enduro stages. Map switch / traction control: Lets the rider change engine mapping on the go for different terrain. Durable and race‑ready: Built to ISDE (Six Days) spec, with strong frame and race-focused components. Good ergonomics: Rider-focused design, with good grip, balanced weight distribution, and flat seat profile. |
| Starter | Kickstarter | — |
| Transmission | 6 Speed Manual | 6 Speed Manual |
