2018 HUSQVARNA MX FOUR-STROKE MODELS

HUSQVARNA FC250

Husqvarna ‘s 2018 four-stroke MX bikes are here! For the information on the two-stroke MX bikes, click here. What follows is the official information blast, straight from Husky:

FC 250

Engine 

All major components and shaft arrangements are carefully designed and placed in specific positions that best suit the performance and handling characteristics of the overall package. The 250cc engine is not only light at 57.5 lbs (26.1 kg) but also remarkably powerful, offering an overall power output of 46 hp at the output shaft.

  • Engine design → light and compact for optimized mass-centralization
  • Outstanding performance → 46 hp peak power and 14,000 rpm rev-limit

Cylinder head 

The DOHC cylinder head features finger followers with a DLC (Diamond Like Carbon) coating, resulting in minimal friction and optimal performance. These actuate large titanium valves (32.5 mm intake, 26.5 mm exhaust) that open and close multiple times each second introducing fuel/air mixture to the carefully designed combustion chamber for efficient and optimal power throughout the rev-range.

  • Large titanium valves (32.5 mm intake, 26.5 mm exhaust) → optimal gas flow
  • Finger followers with DLC coating → reduced friction, better performance
  • Carefully designed combustion chamber → optimal power throughout the rev-range

Cylinder and piston 

The 78 mm bore cylinder houses a forged bridged-box-type piston made by CP. Both the cylinder and piston are professionally engineered from high strength aluminum resulting in outstanding performance and reliability. The compression ratio is 14.4:1.

  • Large 78 mm bore and large diameter valves → high-revving, quick response
  • Forged box-type → high performance and reliability

Crankshaft 

The crankshaft is designed to offer the best possible performance while being placed in the perfect position to centralize oscillating masses for optimal handling. The plain big end bearing features two force-fitted bearing shells, ensuring maximum reliability and durability and guaranteeing long service intervals of 100 hours.

  • Plain big end bearing with force-fitted bearing shells → increased durability and service intervals

Crankcases 

All Husqvarna motocross motors are designed with mass centralization and weight reduction as main criteria. As a result, the crankcases have been designed to house the internal components of the engine in the perfect position to achieve the ideal center of gravity while adding the least possible weight. The casings are manufactured using a high-pressure die-cast production process. The result is thin wall thickness and exceptional reliability. The iconic Husqvarna logo adorns the bronze finished crankcase covers.

  • Crankcases → light and compact; optimized mass-centralization
  • High pressure die cast production process → thin walls for reduced weight, while maintaining strength

Gearbox 

The 5-speed gearbox is designed to be extremely light and durable while featuring motocross-specific ratios. The shifting fork has a low-friction coating for smoother shifting, while the gear lever is designed to prevent dirt build-up and ensure perfect gear selection in all conditions. An advanced gear sensor allows for specific engine maps, delivering the best possible performance in each gear.

  • New lighter 5-speed gearbox → increased durability and improved shifting
  • Integrated gear sensor → specific engine maps for each gear

CSS clutch 

The 250cc and 350cc engines feature a CSS (Coil Spring Steel) clutch with Magura hydraulics. The CSS clutch has six coil springs, seven clutch plates and a one-piece CNC machined steel clutch basket.

  • CSS clutch → lightweight and reliable
  • Magura hydraulic system → high quality, perfect clutch modulation
2018 Husqvarna FC250

 

2018 Husqvarna FC350

FC 350

Engine 

The 350cc DOHC engine weighs in at only 60 lbs (27.2 kg) and has a maximum power output of 58 hp. The engine is specifically designed with performance, weight and mass centralization as key criteria. As a result, all shaft arrangements have been positioned to allow oscillating masses to occupy the ideal center of gravity while all parts are engineered to offer the best possible performance while adding the least possible weight.

  • Performance, weight, mass centralization → 58 hp and only 60 lbs
  • Shaft arrangements → oscillating masses at ideal center of gravity

Cylinder head 

The FC 350 features a DOHC design with polished camshafts and DLC coated finger followers reducing friction and improving overall performance. Added to the design are large titanium valves (36.3 mm intake and 29.1 mm exhaust) that allow the engine to rev freely to the 13,400 rpm ceiling.

  • Large titanium valves → 36.3 mm intake and 29.1 mm exhaust
  • Polished camshafts, Finger followers with DLC coating → reduced friction, better performance

Cylinder and piston 

The 88 mm bore and 57.5 mm stroke cylinder features a large diameter and lightweight forged bridged-box-type piston by CP. As a result, the relatively low oscillating masses deliver exceptional power, high revs and a very wide power band. The compression ratio is 14:1.

  • Lightweight 88 mm diameter piston → reduces oscillating masses
  • Forged bridged-box-type piston → high performance and reliability

Crankshaft 

A top quality crankshaft is at the heart of the high output, high-revving FC 350 engine. The plain big end bearing features two force-fitted bearing shells to ensure maximum reliability and durability, guaranteeing long service intervals of 100 hours.

  • Plain big end bearing → increased durability and service intervals

Crankcases 

The FC 350 features an engine design with mass-centralization and weight reduction as the main goals. All the major components have been positioned to achieve the best possible center of gravity. As a result, the motorcycle benefits from superb handling while ensuring a light and compact engine design.

High-pressure die-cast production processes keep the overall weight to a minimum, resulting in a thin wall thickness while retaining reliability. The iconic Husqvarna logo adorns the bronze finished crankcase covers.

  • Crankcases → mass-centralization
  • High pressure die cast production process → thin walls for reduced weight, while maintaining strength

Gearbox 

The compact 5-speed gearbox features a low-friction coating on the shifting fork, ensuring smooth and precise shifting. The gear lever features a design that prevents dirt build-up for easy operation in the toughest conditions. An advanced gear sensor allows for specific engine maps in each gear.

  • 5-speed gearbox → smooth and precise shifting
  • Integrated gear sensor → specific engine maps for each gear

CSS clutch 

The 250cc and 350cc engines feature CSS (Coil Spring Steel) clutches with Magura hydraulics and lever. The CSS clutch has six coil springs, seven clutch plates and a one-piece CNC machined steel clutch basket.

  • CSS clutch → lighter with more consistent clutch action
  • Magura hydraulic system → German-made precision and quality

 

2018 Husqvarna FC450

 

FC 450

Engine 

The SOHC engine is the perfect example of the advanced engineering techniques used by Husqvarna Motorcycles. It offers a peak power of 63 hp at an overall weight of just 61.3 lbs (27.8 kg). Mass-centralization is key in the engine design, enabling chassis engineers to position the engine closer to the center of gravity for greatly improved handling and maneuverability.

  • Mass centralization → improved handling and reliability
  • Performance → 63 hp and only 61.3 lbs

Cylinder head 

The compact SOHC cylinder head has been designed to offer the maximum performance at the minimum possible weight. The camshaft actuates four lightweight titanium valves that weigh only 32 g on the intake side and 28 g on the exhaust. The diameter of the intake valves is 40 mm, while on the exhaust it is 33 mm. Low-friction DLC coating on the rocker arm and low-friction chain guides offer optimum efficiency and reliability.

  • SOHC → compact engine design
  • Titanium valves → low weight, only 32 g on intake and 28 g on exhaust
  • DLC coating & optimized chain guides → reduced friction

Cylinder and piston 

The lightweight aluminum cylinder is an engineering masterpiece. Featuring a 95 mm bore and a CP bridge-box-type piston that weighs only 320 g. The compression ratio is 12.6:1 for an amazing peak output of 63 hp.

  • Lightweight aluminum cylinder → 95 mm bore
  • Lightweight CP forged bridged-box-type piston → high performance, reduced oscillating masses

Crankshaft 

The inertia produced by the crankshaft is carefully calculated to deliver optimal traction and ride-ability from the powerful 450cc plant. The crankshaft is specifically positioned to harness the rotating mass in the ideal center of gravity, resulting in a lightweight and agile handling feel. A plain big end bearing comprising of two force-fitted bearing shells ensure maximum reliability and durability, guaranteeing long service intervals of 100 hours.

  • Crankshaft position → ideal center of gravity, improved handling
  • Plain big end bearing and force-fitted bearing shells → increased durability and service intervals

Crankcases 

The crankcases are designed to house the shaft arrangements and internals of the engine in the position that offers the best possible handling. Additionally, the position of the clutch shaft keeps the clutch above the oil level resulting in decreased friction and increased efficiency.

High-pressure die-cast production processes keep the overall weight to a minimum, resulting in thin wall thickness while retaining reliability. The historic Husqvarna logo adorns the bronze finished crankcase covers.

  • Design → optimized mass-centralization, increased efficiency
  • High pressure die cast production process → thin walls for reduced weight, while maintaining strength

Gearbox 

The lightweight 5-speed gearbox has a low-friction coating on the shifting fork guaranteeing smooth and precise shifting. The gear lever features a design that prevents dirt build-up and keeps the lever tip in its original position even in the toughest conditions. An advanced gear sensor allows for specific engine maps in each gear.

  • 5-speed gearbox → smooth and precise shifting
  • Integrated gear sensor → specific engine maps for each gear

DDS clutch 

The FC 450 features a DDS (Dampened Diaphragm Steel) clutch. The exclusive characteristics of this system include a single diaphragm steel pressure plate instead of traditional coil springs. It integrates a damping system for better traction and durability.

The clutch basket is a single-piece CNC-machined steel component that allows the use of thin steel liners and contributes to the compact design of the engine.

  • DDS clutch → lighter with better modulation and improved durability
  • Magura hydraulic system → perfect clutch modulation

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