From Kradhaus Bikes: Quick-stroke BMW with a Kaczor racing body…
In 1965, Ferdinand “Ferdi” Kaczor, a younger engineer and motorbike racer, designed and constructed his personal chassis across the BMW R50/2 engine, making a 500cc race bike to compete within the German Bike Championship.
“He refined the [production] engine and doubled the output to 50 hp whereas slicing the load with a particular very gentle and inflexible body to beneath 300lbs.” -BMW Press Membership
Kaczor was so profitable on this 500cc racer that BMW employed him to work in-house, and he turned one of many prime German riders of his time. In 1969, Kaczor set a brand new lap file on the Nürburgring Nordschleife (“The Inexperienced Hell”) on this bike, beating the earlier file set by John Surtees on a four-cylinder MV Agusta. This was just some months earlier than the German Grand Prix.
“Not one of the World Championship rivals, together with Giacomo Agostini, was capable of wrest his file.” –Motorsport Memorial
What’s extra, Kaczor was famend for his expertise within the workshop.
“No matter which up to date witness tells of ‘Ferdi’, everybody raves about his good technical ability. ‘Ferdi even labored his camshafts by hand on the grinding machine,’ says Helmut Dähne, nonetheless deeply impressed right this moment.” –Motorradonline.de
Kaczor started to provide a couple of of his particular self-named Kaczor frames for racers and riders. Sadly, his life got here to an early finish throughout follow for the 1970 Austrian-TT, when he misplaced management of his machine on the strategy to an S-bend within the village of Hollenstein. He was simply 29 years outdated.
Nevertheless, Kaczor’s title and designs lived on, and through the years, completely different builders have reproduced his light-weight body design. Certainly one of these is our new pal Christoph Reintsch of Germany’s Kradhaus Bikes — a person who actually has motorbikes in his blood.
“My great-grandfather was already on the highway in his homeland Bohemia on an Indian earlier than World Conflict II.”
To at the present time, Christoph works within the store together with his father, Horst, and even his grandfather, Josef, and their personal assortment of bikes contains an enviable variety of BMW, Ducati, and Honda fashions courting again to 1937.
Christoph has been constructing bikes since 2006, although the Kradhaus title didn’t seem till earlier this 12 months. In 2020, Christoph and crew acquired their fingers on a body gauge, and now they’re producing racing frames within the Kaczor and Dähne types.
The Kaczor R60/7 you see right here was constructed for Kradhaus Bikes crew member Marlene Mößbauer, who wished a light-weight machine with good efficiency that may be appropriate for her stature. The usual Slash 7 body was modified within the Kaczor racing type, and accompanied with shortened Kawasaki Zephyr forks, 18-inch R45/65 solid snowflake wheels, entrance double disc brake, Benelli Mojave tank, Moto Guzzi fairing, and extra.
The engine was closely breathed upon as properly. Highlights embody modified R100 heads, lightened pistons / con rods / valve practice, digital ignition, twin 38mm Dellorto carbs, 2:2 Hattech exhaust, and a lightened single-disc dry clutch.
The result’s a street-legal BMW café racer that weighs simply 161kg moist (355 lbs), with 75 hp and 60 lb-ft of torque out of the quick-revving short-stroke engine. Says Christoph:
“The entire bike was decreased and slimmed down solely to what was crucial. This leads to the novel and really slim line. The sunshine weight together with the high-turning short-stroke motor is a brilliant mixture.”
In a world the place too many BMW airheads are modified extra for type than substance, this can be a two-wheeled Bavarian scorching rod that’s extraordinarily properly designed and executed, and it establishes Kradhaus Bikes as a workshop to look at. We’ve little question that Ferdi Kaczor could be proud.
Under, we discuss to Christoph and crew for the complete particulars and construct sheet on the construct.
Kradhaus Bikes: Builder Interview
In regards to the Builder:
Christoph Reintsch
- Born on 25.07.1990
- Resident in 92712 Pirk
- Mechanical engineer at ZF Friedrichshafen
Ardour for motorised, outdated two-wheelers was principally strongly rooted in my genes. I normally work on the initiatives with my father Horst (27.01.1959), however my grandfather Josef (20.12.1937) additionally helps me wherever he can. My great-grandfather was already on the highway in his homeland Bohemia on an Indian earlier than World Conflict II.
For so long as I can keep in mind, I’ve been driving with my grandfather on his BMW R100S as a passenger.
Our personal assortment of outdated motorbikes contains BMW and Ducati between 1937 and 1993 (BMW R20 / R66 sidecar / R25/3 sidecar / R60 sidecar / R75/6 / R90S / R100S; Ducati 900 SS Königswelle, Ducati 900 SS; Honda Dax ST50, Honda Dax St70).
Because of our well-equipped workshop with lathe and milling machine, virtually all elements are manufactured by us in meticulous element work. The elements are sketched, prototypes are made by ourselves or 3D printed and, if crucial, designed on the pc after which CNC manufactured. All elements are additionally blasted and powder-coated ourselves (so long as they match within the oven). We additionally restore and optimize motors and gearboxes.
The frames we use are examined, straightened, and fabricated on the body gauge beforehand. For the welding work we have now help by a mate of my father. The body gauge has steadily expanded. To date the body constructing of the racing frames Kaczor, Dähne, and shortly additionally central tube frames is feasible. The straightening of all 2V Boxer frames from 1936 on is feasible and practiced.
In occasions I’m an exhibitor largely with the corporate Hattech on the way in which. The bikes are largely assembled from single elements, due to this fact the takeover of the elements assortment of Anton Hötzinger from Plattling was greater than affordable.
To offer the kid a reputation, the label KRADHAUS was based in 2023, which is now being constructed up little by little.
Private milestones:
- 2006-2007: Yamaha XT 125 – Supermoto modification
- 2011-2012: Honda Dax – Restoration / modification
- 2012-2013: Ducati 900SS Königswelle – Caferacer modification
- 2013-2014: Husqvarna SMR 630 – Supermoto modification
- 2015-2016: BMW R51/3 – full bobber modification
- 2017-2019: BMW R75wh – Full Racebobber modification
- 2019-2020: Yamaha XV535 Virago – Chopper modification
- 2020: Take over body gauge of Anton Hötzinger
- 2020-2021: BMW R90/6 in Dähne body – full build-up Scrambler
- 2021-2022: BMW R60/7 in Kaczor body – full development Caferacer
- 2022: Takeover of the entire Anton Hötzinger elements assortment
- 2022-2023: Fiat Ducato – Bike camper conversion
- 2023: Basis of the “KRADHAUS” label
In regards to the Bike:
The second undertaking with self-modified frames. This and the Dähne body have been in-built parallel.
The concept was to generate an appropriate bike with efficiency and good chassis / know-how for my pal Marlene. She was passionate about driving the Scrambler, however her legs are a bit too brief for it. The bike is extraordinarily enjoyable even with my top, however sadly it appears to be like like a pocket bike beneath me.
The choice-making course of on the color scheme was very lengthy and grueling. Nevertheless, I let myself be persuaded and am very pleased with the ultimate end result.
The entire bike was decreased and slimmed down solely to what was crucial. This leads to the novel and really slim line. The sunshine weight together with the high-turning short-stroke motor is a brilliant mixture. As with the opposite initiatives, a clear look is essential to me.
Closing carburettor tuning is now full with the assistance of a lambda tester to make sure the very best tuning throughout the vary.
Construct Sheet
Kaczor Undertaking – BMW R60/7 (1979)
Engine:
- 4-stroke two-cylinder boxer engine, air-cooled, two valves per cylinder
- engine housing sort R45 / R65 lightened
- uneven camshaft, bore x stroke 94.0 x 61.5mm, displacement 854ccm, compression ratio 10.0:1
- cylinder heads sort R100, modified
- lightened pistons and connecting rods
- valve practice lightened, lighter valve adjustment screws, tappets lightened
- Silent Hektik sort digital ignition
- Two Dellorto PHM carburettors Ø38mm, with brief consumption funnels
- Lightened single-disc dry clutch
- 2in2 Hattech full system “Sidepipe GB25”
- 5-speed gearbox sort /7, 34/11 cardan
Energy: most approx. 75 hp (55kW) at 6150 /min, torque 82 Nm at 5500 /min.
Chassis:
- Commonplace body /7 modified after Kaczor racing body,
- Entrance fork sort Kawasaki Zephyr 750, shortened with progressive fork springs, standpipe Ø41mm
- triple clamps sort K75S with built-in speedometer
- stub handlebars
- Rear commonplace swingarm sort /7, shocks IKON TYP 7610
- 18 inch solid wheels sort R45/R65
- Entrance tyres 90/90-18, rear tyres 110/90-18, sort Conti ClassicAttack
- Entrance aluminium wheel cowl
- entrance double disc brake Ø300mm, rear simplex drum brake Ø200mm
- Wheelbase 1460mm, seat top approx. 740mm
- Tank sort Benelli Mojave, tank capability 10 litres
- hump seat GFK, handlebar fairing shortened sort Moto Guzzi Le Mans II
- Footrest system moved again
Weight: full tank / able to trip 161kg
Time dedication: September 2021 to Might 2022. Approx. 850 h
Observe 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
The post Kaczor BMW R60/7 Café Racer – BikeBound appeared first on lickscycles.com.
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