Map Select Switch, Traction and Launch Control
Designed for easy and intuitive operation, the Map Select Switch comes as standard. It activates Traction and Launch Control, selects between two engine maps (aggressive/smooth), and activates the Quickshifter on 4-stroke models. Map 1 (white) is the standard map for linear, predictable power, while Map 2 (green) is an aggressive map for added throttle response and a more explosive power output.
The Quickshifter can be activated or deactivated via the Map Select Switch. The function works only when upshifting, interrupting the ignition for a fraction of a second. This allows for smooth gear changes, even with the throttle fully open and without using the clutch. The Quickshifter works by a sensor on the shift drum registering the force from the shift lever and sending a signal to the ECU to interrupt the ignition timing. To prevent unintended shifts and false neutrals, the function is only active from second to fifth gears.
With the engine at idle, Launch Control is engaged by pressing the Traction Control and Quickshifter buttons simultaneously. Both symbols will start flashing to indicate that Launch Control is active. This function limits the amount of power to the rear wheel, improving traction, and preventing loss of control under hard acceleration. Once the rider shifts up a gear, the Launch Control will deactivate automatically. Additionally, the Quickshift function is deactivated while Launch Control mode is engaged.
Traction Control on 4-stroke models is engaged by a switch marked ‘TC’ and functions by analysing throttle input from the rider and the rate at which engine RPM increases. If the RPM increases too quickly, the Engine Management System (EMS) registers a loss of grip and reduces the amount of power to the rear wheel for maximum traction. This is a distinct advantage in wet or muddy conditions.
- Handlebar Map Select Switch → alters engine characteristics according to conditions and rider preference
- Quickshift function → clutch-free upshifting
- Traction Control → optimal traction in all conditions
- Launch Control → maximum traction for perfect starts
The combined start/stop switch on right side of handlebar allows for easy, intuitive starting and stopping of the engine.
Engine Management System (EMS)
The Keihin EMS is specifically designed to be small, light, and fast at processing data. It integrates Launch Control for perfect starts, selectable engine maps via the Traction Control switch on the handlebar, as well as the Quickshift function. Combined with the gear sensor, power delivery is tailored for each gear.
A Rollover Sensor (ROS) cuts the ignition in the event of extreme crashes, adding another level of safety to the Husqvarna motocross machines. Additionally, the hour meter comes with an integrated FI status LED and a fuel level indicator.
- Keihin EMS → small, light and fast at processing engine data for more efficient engine management
- Rollover Sensor (ROS) → automatic cuts the ignition during extreme crashes
- Hour meter with integrated FI status LED and fuel level indicator
- Gear sensor → specific engine maps for each gear
Keihin throttle body
The 4-stroke range features a 44 mm Keihin throttle body while the 2-stroke range features a 39 mm throttle body. The injectors are positioned to ensure the most efficient flow into the combustion chamber. To ensure optimal throttle response, the throttle cable is mounted directly without a linkage to provide a more immediate throttle response and feel.
On the 2-stroke models, the 39 mm Keihin throttle body features dual injectors which are positioned for optimal flow and a more immediate throttle response thanks to the direct cable mounting. Idle is controlled over the throttle valve (not over a bypass system as on Transfer Port Injection) with a dual injector setup – one low load injector and one “top-feed” oriented injector for maximum performance before the throttle valve.
In summary, this provides much better idle control, more stable idle behaviour, and a much better fuel/air mixture. The results are more power, more response, and a larger possible fuel/air operation window in comparison to TPI. Therefore, it is less prone to engine cut-outs or hesitations, and less sensitive to different ambient conditions (e.g. temperature, altitude, humidity).
- 4-stroke throttle body → 44 mm, injector positioned for optimal flow, more immediate throttle response thanks to direct cable mounting
- 2-stroke throttle body → 39 mm with two injectors positioned for optimal flow and more immediate throttle response thanks to direct cable mounting