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2018 KTM 85 SX 17/14  The riders of the junior class are not beginners. These are future champions fighting for victory, no matter if it is the AMA Amateur National Title or Junior Motocross World Championship. The 2018 KTM 85 SX is a completely new weapon for class supremacy. An all-new model from the ground up, the 85 SX boasts an engine with more power and ridability across the entire rev range and a chassis that allows the rider to use every bit of that power. There is no 85cc machine that is more READY TO RACE than the 2018 KTM 85 SX.

Highlights

2018 KTM 85 SX 
  NEW engine with improved power and torque over the entire rev range is 1.5 pounds lighter.
  NEW cylinder is designed around an all new power valve system that is adjustable and increases torque and controllability.
  NEW crankshaft is lighter than before while having more inertia for better torque. Optimized balancing reduces vibrations.
  NEW DS (Diaphram Spring) clutch is more compact with better performance than a conventional coil spring design.
  NEW crankcases are more compact with a shaft arrangement that is close as possible to the center of gravity.
  NEW lighter transmission with the same motocross-specific gear ratios.
  NEW chomoly steel frame is nearly a pound lighter with 7% more torsional rigidity and 25% less longitudinal stiffness for more agility and better bump absorption.
  NEW WP AER 43 front fork with a sophisticated air spring design and separate damping for easy adjustment to any track condition, rider weight or skill level.
  NEW WP PDS (Progressive Damping System) rear shock provides excellent bump absorption and stability.
  NEW aluminum subframe is lighter and more compact for better mass centralization.
  NEW cooling system features integrated crankcase cooling and two radiators for high performance. The newly designed system uses the shroud and grill to protect the radiator in a crash.
  NEW sharp bodywork that is based of the full-sized SX models with the same contact points and overall feel for perfect ergonomics.
  NEW airbox similar to the larger SX models allows for air filter changes in seconds without tools.
  Black coated high-end Excel rims, lightweight, CNC machined hubs and black spokes with lightweight aluminum nipples ensure the highest stability at minimum weight on the KTM 85 SX.
 

Technical Specs

2018 KTM 85 SX 
  Engine Type: Single Cylinder, 2-Stroke
  Displacement: 84.9 cc
  Bore / Stroke: 47 / 48.95 mm
  Starter: Kickstarter
  Transmission: 6 Gears
  Fuel System: Keihin PWK 28
  Lubrication: Premix 40:1
  Primary Ratio: 20:64
  Final Drive: 13:46
  Cooling: Liquid Cooling
  Clutch: Wet Multi-Disc DS Clutch, Formula Hydraulics
  Ignition: Kokusan
  Frame: Central Tube Frame, Chrome Molybdenum
  Subframe: Aluminum
  Handlebar: Tapered Aluminum Ø 28/22mm
  Front Suspension: WP USD AER 43 Ø 43 mm
  Rear Suspension: WP PDS Monoshock
  Suspension Travel Front/Rear: 280 mm / 11 in.; 305 mm / 12 in.
  Front/Rear Brakes: Disc Brake 240 mm / 210 mm
  Front/Rear Rims: 1.40 x 17"; / 1.60 x—";
  Front/Rear Tires: 70/100-17"; / 90/100-14"; MAXXIS
  Chain: 1/2 x 5/16 in.
  Silencer: Aluminum
  Steering Head Angle: 24"
  Triple Clamp Offset:— mm
  Wheelbase: 1,290 mm ± 10 mm / 50.8 in ± 0.4 in.
  Ground Clearance: 352 mm / 13.9 in.
  Seat Height: 855 mm / 33.7 in.
  Tank Capacity, Approx: 5.2 L / 1.4 gal.
  Weight (without fuel), Approx: 67 kg /—7.7 lbs.
 

Features and Benefits

Engine  Cutting-edge 2-stroke technology, combined with a precise 6-speed transmission and hydraulic clutch are the foundation of the KTM 85 SX's superiority in all junior racing competition. The new KTM 85 SX engine uses the latest technology to deliver unrivaled performance in the competitive 85cc class. With an unchanged bore and stroke, the engine is 1.5 pounds lighter and delivers improved power and rideability along the complete rev range. Key to the engine is a new power valve which allows the power delivery to be tailored simply and more effectively than before.
 
Cylinder  The new cylinder has an unchanged bore and stroke (47/48.95mm) with new ports to improve performance and response. Additionally, it is designed around an all new power valve system. This system controls both the exhaust valve and the sub exhaust port for significantly improved power, torque and controllability. As a result, the KTM 85 SX receives a significant increase in mid-range performance reducing the need to use the clutch in loamy or sandy conditions. An adjuster screw allows the opening timing of the power valve to be adjusted to suit rider preference and track conditions and by changing between different power valve springs (available in the KTM PowerParts catalog).
 
Crankshaft  The all-new crankshaft is now lighter with optimized balancing to reduce vibration and oscillating mass. Even after removing this weight, the rotational inertia of the crankshaft has increased by 1 pound, improving torque and rideability. Thanks to its perfectly sized lightweight connecting rod, the crankshaft is distinguished by minimum vibrations and maximum durability.
 
Crankcases The crankcases are manufactured using a high pressure die-cast production process keeping wall thickness to a minimum while retaining strength and durability. The design of the new cases is more compact and aims at positioning the shaft arrangements as close as possible to the center of gravity for improved handling.
 
Exhaust System The new exhaust system is perfectly suited to the engine's power characteristics and contributes to the outstanding performance and rideability. The pipe is made in a 3-dimentional stamping process by WP Performance Systems. Once the components are shaped they are robot welded to ensure the highest level of quality and durability. The new silencer is 50mm shorter, improving mass centralization.
 
Clutch The hydraulic clutch mechanism by Formula ensures an easy clutch action and well-defined modulation on the KTM 85 SX. Replacing the previous coil spring design, the KTM 85 SX features a new diaphragm spring clutch. The new design is 0.8 pounds lighter, more compact and also benefits from added durability.
 
Handlebar  The KTM 85 SX has a super strong, tapered handlebar made of high-quality aluminum alloy with a bend that's perfect for motocross requirements. They get a new throttle assembly that allows for easy free play adjustment. ODI lock-on grips on the left side make grip changes easy and do not require any wire or glue to be secured.
 
Brakes  The Formula braking system with radial calipers \x96 four pistons in front, two in the rear \x96 with lightweight wave brake discs \x96 front 240mm diameter, rear 210mm \x96 are the ultimate in terms of controlled action and braking performance.
 
Cooling System  A constant temperature balance for consistent, high performance is ensured by an intelligent cooling circuit with integrated crankcase cooling and two radiators. It routes the coolant from the cylinder head through the frame triangle, directly to aluminum radiators made by WP. Thanks to flow optimized internal circulation and CFD-calculated ventilation, the system is superbly efficient. In addition, new radiator protections improve heat dissipation. Especially in the mud. They are also integrated into the front part of the shrouds to protect the radiators in a crash.
 
Air Filter Box What is good for the bigger KTM off-road bikes cannot be bad for the 85 SX: an air filter change can be done within seconds without tools.
 
Wheels  Black coated high-end Excel rims, lightweight, CNC machined hubs and black spokes with lightweight aluminum nipples ensure the highest stability at minimum weight on the KTM 85 SX. The OEM MAXXIS tires are renowned for their perfect traction and outstanding performance.
 
Frame  Professionally crafted by WP Performance Systems, the chromium molybdenum steel frame is constructed using hydro formed tubes joined by precision robot welding to ensure the highest level of consistent quality. The frame sees a weight saving of nearly a pound and features a new geometry aimed at tailoring flex characteristics for improved handling and comfort. As a result, and in conjunction with new laterally mounted cylinder head mountings, the torsional rigidity is increased by 7% while longitudinal stiffness is reduced by 25%. This allows the frame to move in harmony with the suspension effortlessly soaking up big hits while also delivering improved agility and high speed stability. Additionally, the frame is fitted with new 'No Dirt' footpegs which prevent the build-up of dirt collected through deep ruts and muddy terrain. The simple but effective self-cleaning system ensures the footpeg returns to its original position providing complete control in all conditions. The frame is finished off in a highly durable powder coating with standard frame protectors.
 
Subframe  Made from lightweight aluminum, the new subframe features a shorter and more compact profile. It is now 75mm shorter and 0.5 lb lighter, which not only contributes to the overall weight reduction but also improves mass centralization.
 
Rear Suspension  On the rear, a specific version of the new WP Xplor PDS shock absorber is fitted to the KTM 85 SX. PDS stands for the unique progressive damping system developed by WP together with KTM which provides excellent sensitivity and at the same time outstanding bottoming resistance. Full adjustability of compression and rebound damping and preload are KTM standard.
 
Front Suspension  Up front, the WP AER 43 consists of a split fork design using a capsuled air spring in the left leg and the trusted oil damping system in the right leg. The new components offer a significant improvement in suspension performance with a reduction in weight of 2.2 pounds and an increase in wheel travel to 280mm total (+10mm). Additionally, adjustment is made simpler thanks to the single air pressure valve and supplied fork air pump for preload and easy access clickers for compression and rebound.
 
Bodywork  When scaled down to the proportions of an 85cc rider, the contact points and feeling remain the same allowing the younger riders to feel the same control and comfort found on the larger models. The improved ergonomics instill confidence while also leaving room for free and unrestricted movement thanks to the broader and flatter seat and one piece air filter box cover.
 
Graphics  The cool graphic design provides a striking look based on the big bikes. Don't be surprised when someone mistakes you for a grown-up.