Harley-Davidson Low Rider S Tuning - 131cui Stage IV

Harley-Davidson in Lübeck, has taken on the Low Rider S from the 2020 model year to show what the DYNOJET tuning and the Stage IV kit bring to the 114cui Milwaukee-Eight engine in terms of increased performance.

Let's start with the standard model, because the Low Rider S is by no means underpowered ex works. It has the Milwaukee-Eight 114cui engine for propulsion. Converted to almost 1.9 liters of displacement, this produces 69 kW (94 hp) and 155 Nm at 3000 rpm, which already ensures a sporty appearance ex works.

With an unladen weight of 308 kilos, it easily reaches a top speed of 190 km/h. It has a 28 degree steering head angle, which gives the rider this special seating position, you sit in it and have the command center in front of you in an orderly fashion. So much for that, you could be satisfied if you weren't familiar with the Low Rider S 131cui Stage IV tuned by House of Thunder.

Low Rider S 114 cui - production bike

She is a monster!

Unbelievable, we're talking about two completely different worlds here! The Stage IV kit gives it a displacement of over 2.1 liters, which some cars don't have and certainly not in just two cylinders.

The Stage IV kit is now complemented by the Midland air filter in combination with the Jekill & Hyde exhaust system. The Stage IV kit is also modified by House of Thunder and is generally tuned specifically for each vehicle on the in-house dynamometer. This is because each engine has its own performance data and there are technical differences between the Softail and Tourer engines. The entire tuning package is tuned by Jens Pott (House of Thunder) on the DYNOJET 250i dynamometer. This eddy current-braked Dynojet 250i dyno can be found wherever you want to be very precise and not just do it off the cuff. With motorcycle manufacturers, in racing and with experts who really understand tuning.

Intervention in the engine electronics is only for experts

Interventions in the engine electronics belong in the hands of specialists, otherwise you will quickly pay for it. Jens Pott is an expert in this field, he is the DYNOJET general distributor in Germany and advises many of his Harley-Davidson dealer colleagues in this role.

But enough beating about the bush, what's the bottom line? It's amazing, I would have expected anything, but not such an enormous increase in performance. At the same time, it's totally easy to ride and doesn't seem unruly. The power delivery is brilliant, basically you only need three gears, 1st gear for starting off, 3rd gear in the city and 6th gear from 80 km/h upwards.

The engine is tuned in such a way that it provides its 180 NM from 2500 rpm and this is only reduced at around 5100 rpm. If you accelerate in 6th gear at 80 km/h, the bike pulls away at full throttle, up to well over 200 km/h, the speedometer display is certainly not enough. If you shift through the gears individually, you really have to hold on tight, I've ridden 1100cc Kawa and the like before, but this was something else, really perfect. Despite its over 300 kilos, the egg-cup fraction under 170 hp really has a problem when the Low Rider S appears in the rear-view mirror and roars from behind.

Good handling ex works

What really surprised me was the behavior of the brakes, the suspension and the Michelin Scorcher tires. The entire standard combination is full of reserves, which I would not have expected. Especially when you accelerate out of a bend at a slight lean angle, it stays on track. This shows how perfectly tuned it is, it remains very easy to control despite the power.

The question is rather whether you have yourself under control, because it is fun. The nice thing is that the Low Rider S 131cui has plenty of power and torque in every gear, so you can glide along quietly and without shifting gears and cruise along the country roads. The Low Rider S 131cui is also suitable for touring, and this 2020 model is fitted with Thunderbike's forward-mounted footrests. The tuning kit with the Jekill & Hyde system in combination with the air filter etc. is available for the 2021 models.

What really surprised me was the behavior of the brakes, the suspension and the Michelin Scorcher tires. The entire standard combination is full of reserves, which I would not have expected. Especially when you accelerate out of a bend at a slight lean angle, it stays on track. This shows how perfectly tuned it is, it remains very easy to control despite the power.

The question is rather whether you have yourself under control, because it is fun. The nice thing is that the Low Rider S 131cui has plenty of power and torque in every gear, so you can glide along quietly and without shifting gears and cruise along the country roads. The Low Rider S 131cui is also suitable for touring, and this 2020 model is fitted with Thunderbike's forward-mounted footrests. The tuning kit with the Jekill & Hyde system in combination with the air filter is not yet available for the 2021 models. (As of April 2021),

Harley-Davidson Low Rider S 131 Cui Stage IV

Combination of Stage IV 131cui (2.1 liter) displacement kit and House of Thunder tuning

Jekill & Hyde with Midland air filter and combination certificate

DYNOJET Tuning House of Thunder

Forward-mounted footrests from Thunderbike

The Harley-Davidson Low Rider S 131 Cui Stage IV, can be ordered from Harley-Davidson Lübeck ( House of Thunder), where you can also get expert advice on tuning.

If you have any further questions on this topic, there will be a Facebook event on 08.04.2021 from 18:00. Harleysite livestream and we will answer your questions. You are welcome to send them in advance to info@harleysite.de send.

Harleysite Facebook Livestream directly from Lübeck