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‘84 BMW K100RS – Paul Hutchison

Posted on May 16, 2014 by Andrew in Café Racer. 25 comments


The late 70s was not an easy time for poor old BMW Motorrad. With mounting pressure from the European Union regarding emissions, and their all-too-slow awakening to the fact that Japanese motorcycles were eating their lunch, the Germans were staring down the barrel or irrelevancy. Suddenly, water-cooled fours were all the rage; the 70s journo’s penchant for top speed tests always left the boys from Bayerische with das ei on their faces. What they needed was a unique, powerful, water-cooled platform – and quick. In a classic piece of outside-the-square engineering, they began experimenting with a Peugeot car engine which they decided to lay down in a ‘longitudinal four’ configuration not seen since the pre-WWI-era. And the rest is history – a history which Paul Hutchison from Melbourne has successfully reinvented with his über K100RS.


“I’m Paul Hutchison (Hutch) from Melbourne, Australia. I’m an airline pilot, with a military flying background. I was inspired by Robrock’s K100 build I saw on BikeExif and started looking. I found one unregistered, in Adelaide. I bought it sight unseen, and did a 1600km trip to collect.

Kicking the build off, I wanted to blend the café racer style with street fighter, taking what I thought were the best elements of each. I had no clear plan before starting, it evolved as the build progressed.”


After countless hour of internet trawling, Paul made the decision to spend that little bit of extra cash and go top shelf. The BSK SpeedWorks rear sets were made to order, fitted perfectly, and look like works of art.

Paul was keen for the bottom line from the tank to flow smoothly through to the tail-piece. After making some rough drawings, he mocked something up using old plastic chopping boards. Then his local fabricator managed to magic it into a perfect aluminium replica of the plastic piece.


“My mate Pete of Peter’s Panels offered to do the paint job for a couple of bottles of scotch on the condition I did the preparation work. The colour is from a new range called ‘vibrance’. It was a nod to BMW’s 70s colours, but with added metal flake. It turned out the colour I chose is called “hornet orange”. As I flew hornets in the RAAF, the bike now had a name, ‘The Hornet’.

About four months after completing the build, I took it to Tasmania for a week of riding. On the third day my good friend Kev managed to lose the front end while braking into a corner. The resulting low side caused enough damage for the bike to be an insurance write off.”


Down but not out, Paul bought the wreck and used the rest of the pay-out money for a full rebuild. Not wanting to put in all the extra time and effort just to end up with the same bike, he decided to do some upgrades. Again. He found out he could get four-spot calipers on the front if he could manage to install a complete K1100 front end. “I decided that if it was worth taking the bike five years into the future, why not something more like twenty years?”


Paul searched the wreckers for a clean upside-down front end. He wanted a 3 spoke front wheel to match the K1100 rear wheel he had sourced. A ‘00 Yamaha R1 was deemed the best solution. He went back to Valley Engineering, his fabricator, to mate the Yamaha clamps to the BMW post. Despite the myriad issues involved, the end results couldn’t look prettier. And as a finishing touch, the headlight was replaced with a Yamaha MT-03 unit from the UK.


Paul says that the finished bike is better than he could have ever hoped for and notes that it now rides like a modern motorcycle. No doubt the Pirelli GT tyres and the new front end have truly transformed the handling, and those brakes are probably more than equal to any modern K1200R. Lucky bastard.

  • Paul

    That is f**kin sick. Nice work.

  • saveAMERICAfromTHEnutters

    Great stuff!

  • hugh

    Really nice lines! But I just can’t like those Yamaha brake callipers…

    • cab305

      Not sure what you are looking at, maybe individual lines, cause there aren’t 2 that match on that whole mess.

  • TJ Martin

    …. and now we have four ! The Top Four that is ….

  • I love K-bikes. That big brick of a motor has an industrial look that other motors don’t have. This bike has an elegantly brutal look – and so well done it looks like a factory concept bike.

  • Meisterrobrock

    Congratulations Paul & Thanks for mentioning me. Great job, I like it.
    Marc Robrock of

  • R65 Cafe

    The lines of the tank and headlight are spot on. As Paul says ……. Nice work!

  • Yeah. Gobsmacked that the headlight works so well. Gotta love serendipity…

  • Ryco Diawan


  • Something I left out of the intro but that is very interesting is that this engine config also means there’s no 90 degree turn (and therefore power loss) for the drive to go through between the engine and rear wheel.

  • Folke Bredkjær

    Great work and so amazingly awesome in orange. Its way better than Roland Sands ‘homage’.

    • bsa

      This is an awesome bike, but that’s a big call. The Roland Sands bike is sex on wheels.

      • Folke Bredkjær

        Well I must learn to put in a ‘acording to me’. I think nothing as bold as sex on wheels about Rolands BMW. Actually quite the opposite. But I really respect your view on it. Because you might see something I don’t and if that is adressed it can broaden my world.

  • 50merc

    One of the baddest Beemers I’ve seen. beutiful!!

  • BoxerFanatic

    Love the Hornet orange color, and I prefer the K100 tank to the K75 tank.

    I wonder if there is a Hossack-modified K-bike left anywhere, or the parts to fit a Hossack front end to a K-bike like this. Duolever before it’s time.

  • Cliff Overton

    Great to see it back together again after the drop – and looking better than before.

  • Jeffrey Wallis Bell-Zekas

    This is the first time i have seen a K100 that actually looks good… too bad the factory doesn’t build them this nice… the shape, the balance of various elements and the colour everything is perfect…

    • cab305

      You need to look harder, cause this is nothing but a mess (not even a hot mess). There is nothing that jives, straight line angular tail has 0 to do with the tank. The rear subframe angles down literally bending the bike in the middle. They didn’t even adjust the suspension sag so the swing arm is perfectly horizontal, (it matches the engine lines) sorry but this is horrid. Here is a k100 done right

  • GMC

    Stunning! This build just inspired me to start looking for a bargain K, especially now the old airheads seem to be getting scarce and rather pricey over here on the emerald isle

  • Goober

    right up there with the best looking (so far) K-bike around:

  • Doug Button

    I didn’t think I had a dream bike, until now.

  • Noah

    I’m about to begin doing a very similar build, What style of headlight bucket is that? I’m looking for the same style but can’t seem to find anything. Also I am in love with this bike! K bikes are phenomenal!

  • Stein M

    HI Paul, love it. Currently working slowly on my own K100: …. But I need help with the muffler? What make / model did you use? Many thanks,
    Stein in Canada (

  • cab305

    If you don’t fix the frame…. you are wasting your time.