Dähne-framed Day by day Rider from Kradhaus Bikes…
Born in 1944, Helmut Dähne is a BMW motorbike racing legend. As a teen, he went to work for BMW Motorrad as a mechanic and later went to German tire model Metzeler, working with race groups at circuits round Europe and past. However he’s greatest identified for his racing exploits.
Whereas he was too tall for GP racing (~6’3″), Dähne was a power on production-based machines from the Seventies-90s, racing at lengthy circuits just like the Nürburgring Nordschleife and Isle of Man Snaefell Mountain Course, often carrying his signature purple and white leathers.
Few different riders can say they rode their very own racebike to the Isle of Man…particularly from as distant as Germany!
“He was one of the crucial in style heroes to race within the Isle of Man Manufacturing TT within the Seventies and his title is synonymous with BMW motorsport. The lanky German rider gained his military of followers as a result of he was a real fanatic who ready his personal bike, rode all of it the way in which from Munich to the Island, raced it over the Mountain, after which rode it dwelling once more.” –Motorcyclist
Dähne additionally helped develop a body specially-designed for racing, powered by a highly-modified 750cc R75 air-cooled boxer engine. In 1972, he gained the legendary Imola 200 on such a racer, and in 1976, he lastly gained a TT, racing within the 10-lap 1000cc manufacturing class on a modified R90S…utilizing a cylinder head he borrowed from a spectator’s bike after breaking an exhaust valve in observe!
What’s extra, the same body was utilized by the Butler & Smith staff that campaigned the R90S within the first yr of AMA Superbike.
Enter our new pal Christoph Reintsch of Germany’s Kradhaus Bikes — a person whose motorcycling heritage runs again to his great-grandfather, who was using an Indian round his native Bohemia within the years earlier than World Conflict II. Immediately, Christoph works within the store along with his father and even generally his grandfather, and he’s lately begun constructing his personal frames, using the time-honored designs of previous racers like Ferdi Kaczor and Helmut Dähne.
Final month, we featured the “Kaczor” R60/7 constructed for Kradhaus’s media and advertising and marketing supervisor, Marlene Mößbauer. That bike used the body design of Ferdinand “Ferdi” Kaczor — a BMW engineer, racing legend, and modern of Dähne’s.
On the identical time, Christoph constructed the Dähne body that underpins this scrambler. Whereas the Kaczor body and attendant suspension have been ultimate for Marlene’s petite stature, this Dähne-framed construct was arrange for Christoph’s taller proportions, utilizing Kawasaki Zephyr 750 forks and Ikon rear shocks.
“The concept was to generate an appropriate ‘on a regular basis car’ for my measurement with good efficiency and chassis / expertise. With the supermoto previous, the type course of the bike was clear. Optionally, the bike will be modified to avenue tires.”
Whereas the engine cowl could learn “R75/6,” it’s truly a 1065cc with high-compression pistons, lightened internals, Dell’Orto carbs, and a 2:1 Hattech exhaust system. The air-cooled boxer engine now makes a stout 80 hp and 92 Nm (68 lb-ft) of torque.
The result’s a novel each day rider excellent for Christoph’s stature, with stable energy, upgraded brakes, and loads of flat-twin grunt. Beneath, we speak to Christoph for the complete particulars on the construct.
BMW Scrambler: Within the Builder’s Phrases…
This was our first undertaking with a self-modified body. This and the Kaczor body have been inbuilt parallel. Resulting from my peak, this body was used for the Scrambler conversion. The size to the rear higher shock mounts and the longer shocks / fork lead to the next seating place.
The concept was to generate an appropriate “on a regular basis car” for my measurement with good efficiency and chassis / expertise. With the supermoto previous, the type course of the bike was clear. Optionally, the bike will be modified to avenue tires. As with the opposite initiatives, a clear look is essential to me.
The engine with huge bore equipment was self-built and additional optimized. The usage of the outdated air filter housing and the hood with “R75/6” lettering gives a well-behaved look. Remaining carburetor tunings are actually operating with the assistance of a lambda tester to make sure the absolute best tuning over your entire vary.
Construct Sheet / Specs
Energy: approx. 80 hp (57kW) at 6330 /min, torque 92 Nm at 4900 /min
Engine:
- 4-stroke two-cylinder boxer engine, air-cooled
- Engine case R100R, Large Bore Package
- Asymmetrical camshaft, bore x stroke 98.0 x 70.6 mm
- Displacement 1065cc, compression 10.5:1
- Double ignition, sort silent rush
- Cylinder heads, sort R100, modified
- Piston and connecting rod lightened
- Valve prepare lightened, lighter valve adjustment screws
- Two Dellorto PHM carburetor Ø38mm, consumption sort /7
- Facilitated single-disc dry clutch
- 2-into-1 Hattech full system “OYK”
- 5-speed gearbox sort /7
Chassis:
- Body: Collection /7 modified in accordance with Dähne / Butler & Smith racing design
- Entrance fork: Kawasaki Zephyr 750, shortened with progressive fork springs, Ø41mm
- Triple clamps: K75S
- Rear swingarm: sort /7
- Shocks: IKON Sort 7610
- Entrance 19 inch spoke wheel, rear 18 inch spoke wheel
- Entrance tires 100/90-19, rear 120/90-18, sort Heidenau K60
- Aluminum wheel covers,
- Entrance double disc brake Ø 300mm, rear drum brake Ø200mm
- Tank: Moto Guzzi Le Mans II with built-in speedometer
Time required:
September 2020 till June 2021
Approx. 800 h
Comply with the Builder
KRADHAUS – Bavarian Customized Bikes
Christoph Reintsch
Media and advertising and marketing: Marlene Mößbauer
Internet: www.kradhaus.de
Instagram: @kradhaus_bikes
Fb: Kradhaus Bikes
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