Header Rider

How it works

KessTech Racestart

It opens the flap for the starting process and lets you hear the full sound of the bike at the first breath.
Afterwards, the system switches to OFF mode as usual and closes the flap. 
In addition, the ESE now saves the desired start variant, ie you can choose for yourself whether with or without Racestart!

This change can be made as often as you like and remains stored on the ESE! 
For safety reasons, this only works when stationary at 0km/h.

This is how it works:

If you press the handlebar button for 5 seconds while stationary, the ESE switches between the features and activates or deactivates the Racestart. This is indicated by:


Blue Heartbeat

Racestart active


Green Heartbeat

Silentstart active

KessTech Racestart

On 'Play' external media is loaded and YouTube sends you some cookies!
Accept & PlayAccept for All Videos & Play
KessTech Exhaust System

Take it Easy!

ESE (Electronic Sound Experience) enables the biker an unique driving experience with Full-Volume Sound. In addition to the OFF and ON mode, ESE is equipped with a third mode MEDIUM, in which the exhaust valve takes on an intermediate  position and provides the rider with an additional, third, cleary distinguishable sound option. Additionall, there are two market innovations – the Power-Feature and the Active Engine Protection: 

ESE provides you with power, if you require it! In the OFF and the MEDIUM mode, an additional burst of power is available. ESE automatically detects when a rider suddenly requires more power (for example while overtaking or in a dangerous situation that requires immediate power) and delivers the additional power without that the rider has to change the mode.

Active Engine Protection
When you are in OFF mode and ESE detects that the vehicle engine is getting hotter and hotter, for example at a red light, the valve opens automatically a little bit in order to reduce the exhaust gas back pressure and to let the heat go out. If the driving profile changes to a thermally more uncritical situation, you will change to OFF mode again.

ESE Software Upgrade at no cost
We are coming up with something new again and again. Therefore, all ESE systems will always receive future software upgrades at no cost! For this, the electronic has to be sent to KessTech and we make sure it is up to date. 

ESE OFF mode
ESE exhaust OFF mode

OFF Mode

Whenever you feel like, you can drive quietly < OEM, in a residential zone, passing by the city park or when arriving home late – everbody will love you!

ESE ON mode
ESE exhaust ON mode

ON Mode

Whenever you as driver feel like enjoying the full sound, you can drive in the ON mode, when on a country side road, driving thru hills and valleys or passing by your city café – you will love it!

ESE exhaust MEDIUM mode


Whenever you like, you can also try the MEDIUM mode – by using MEDIUM you are able to enjoy longer trips much more relaxed or while having your buddy on the bike – not only you, but your partner will love it! MEDIUM mode ist just available while driving.

KessTech Exhaust System

KessTech Regulatory*

KESSTECH exhaust systems are delivered with an EU type approval, in order to obtain this approval certain values must be tested and complied with. 
Emission values, power values (+/-5% to OEM) as well as the sound pressure emission values, colloquially noise emissions. With the handlebar switch, which is always supplied with our flap exhaust systems, you can choose since Euro 4 and the ESE system between the modes ON- / MEDIUM- & OFF-Mode. 
All values are maintained in each mode, because of that the adjustment on the handlebars is completely legal! 
The electronics regulate the flaps in such a way that the legality is always maintained and the driving experience is maximally increased. 
Nevertheless, we point out to behave considerately to other peoples on the roads. Adjust your driving mode to the driving situation and in a fraction of a second the change is implemented directly on the system.


Idle noise: At a nominal power higher than 5000 rpm, the measurement is made at half the nominal engine speed. 
Distance 0.5m with 45° to the vehicle, starting point is the upper outlet edge of the rear silencer. 

Pass by: Entering the measuring section at 50 km/h in 2nd and 3rd gear at 50 km/h, at entry into the test track, full throttle acceleration until the vehicle exits the test track. 

EURO 4 und 5 

Idle noise: At a nominal power higher than 5000 rpm, the measurement is made at half the nominal engine speed. 
Distance 0.5m with 45° to the vehicle, starting point is the upper outlet edge of the rear silencer. 

Pass by: With Euro 4, the vehicle has, among other things, a power-to-weight ratio dependent, calculated target acceleration which plays into the final result Lurban. Therefore, the measurement is different than before and not comparable.

LWot: The test conditions for accelerated passing can be taken from this, which is clearly visible on the vehicle frame. Test speed, entry speed, pre-acceleration distance and the sound pressure level. 
In the middle of the test section, 50 km/h must be reached. If the target acceleration is not reached, the test has to be performed in 2 gears.

Lcrs:  The constant speed run is measured in the same gear as the accelerated pass-by. 
The test speed is 50km/h.  If Lwot is measured in 2 gears, Lcrs is also measured in these gears.

ASEP: The test range here has been extended to theoretically all gears in a speed field between 20-80km/h This is limited by a minimum and maximum motor speed.
Therefore the measuring range is shifted depending on the gear. The procedure is similar to the accelerated pass-by.
So if one drives in the corresponding gear very constantly within the limits and then gives full throttle, the noise values must also be maintained and therefore the flaps close.

*The corresponding explanations are a highly simplified version of the wording of the law and therefore do not claim to be exhaustive.