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olivereliott · 5 years ago

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Knockout Krauser: A four-valve R100 from Ironwood

Ironwood Custom Motorcycles get frequent requests for their signature R-Series BMW bobbers. But when a regular client rolled in with a unique donor, shop boss Arjan van den Boom knew he had to up the ante.

The bike in question was a 1982 BMW R100—but with a very special motor. It was packing a full Krauser upgrade, complete with four-valve heads, Nikasil barrels and an electronic ignition.

The client was a BMW and Porsche fanatic with very discerning taste. So whatever the Dutch shop built would need to be special.

Arjan and co. answered with a sharp, low-slung bobber that follows the typical Ironwood aesthetic, but with a slew of trick upgrades.

First, the boxer shed all of its 80s bodywork in favor of a more minimalist setup. Ironwood swapped the /7 fuel tank for a /5 unit, and added a solo seat with upholstery by Marcel from Miller Kustom Upholstery. They built a new pair of fenders too, with hand-made struts supporting them.

Out back, the crew ditched the subframe and fabricated a new seat support and shock mounts. The BMW now sits on a pair of new rear shocks from TFX.

The front forks are Öhlins, lifted from an Aprilia Tuono. Ironwood kept the stock wheels, but wrapped them in modern, street-biased Continental Classic Attack tires. The front brakes were upgraded to Brembo units, with 320 mm discs for extra bite.

The highly tuned motor didn’t need any internal work, but on the outside it was cleaned up and re-done in black, with gold for the valve covers.

Ironwood installed a pair of Mikuni TM40 flat side carbs, and DNA Filters supplied a set of pod filters with gold tops that feature Ironwood’s logo. There’s an extra hit of gold in the form of a custom crankcase breather tube.

The exhaust system’s a pretty special touch too. Marcel van der Stelt from The Custom Factory was pulled in to build a stainless steel two-into-one system, which terminates in an aggressive-looking Ixil muffler (originally designed for the Yamaha XSR700).

Ironwood also rewired the bike from top to bottom, with a Motogadget m.unit control box at the heart of the system. All the lights are LED, with a Koso ‘Thunderbolt’ headlight, Kellermann taillight/turn signal combos out back, and extra running lights on the frame.

There’s a whole lot of Motogadget stuff in the cockpit too—including the speedo, switches, grips, bar-end turn signals and mirrors. The grips have been wrapped in the same leather as the seat, and sit on a set of CNC-machined clip-ons. And the speedo’s integrated into a custom-machined top yoke.

We were lucky enough to see this bobber in the metal at BMW’s Pure&Crafted event in Amsterdam, and spotted a lot of details that you’d only notice if you were close. The leather battery box is one nice touch, but the small leather cable holders are even more thoughtful.

Ironwood opted for a simple an elegant paint job: a coat of Porsche Pasha Red, laid down by Jacco from Royal Kustom Works. If you’re a Porsche enthusiast, you’ll know that this particular hue was introduced in the 1950s and often paired with tan leather back in the day.

It’s not every day that you see a pair of Krauser’s peculiar four-valve heads roaming the streets. And seeing them in such a suave modern build is an even more rare treat.

Equal parts aggressive and elegant, this Beemer is a solid entry into Ironwood’s ever-growing portfolio.

Ironwood Custom Motorcycles | Facebook | Arjan van den Boom Instagram | Images by Paul van Mondfrans Lindén

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ridershopmanizales · 3 years ago

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olivereliott · 6 years ago

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The Enforcer: an XSR700 from Ironwood Motorcycles

It’s just over three years since Yamaha launched the XSR700, and sales have been slow. That’s almost certainly down to the awkward styling, because the XSR700 is a good bike to ride—and the 689cc inline twin (with crossplane crank) is an absolute peach of a motor.

The obvious visual flaws have prompted many builders to have a crack at the XSR700, with varying degrees of success. The latest to attempt the silk purse treatment is Arjan van den Boom of the Dutch shop Ironwood, and he’s hit a home run.

“The customer asked me for something cool,” says Arjan. “Different, high-end, drivable either in Amsterdam or Ibiza, and inspired by the Yamaha TW.”

Arjan is a fan of the XSR700. “It’s a fun bike: compact, enough power, playful handling and just made for aesthetic adjustment.”

The customer wanted a bike that looked ‘brutal’ but was also great to ride. “He was inspired by our XSR700 TW Steel café racer, and wanted something similar—but with an upright riding position and better handling.”

‘The Enforcer’ has similar DNA—on the general lines, the tank and the ‘Brat’ seat—but with different bars and bulky wheels it has a more of a scrambler/tracker vibe.

Amazingly, no welding or cutting was involved. Instead, the Ironwood crew have grafted on an entire Yamaha YZF-R1 front end, including the brakes, which should elevate the handling to a whole new level.

The setup is finished with a custom brace holding an integrated Motogadget Motoscope Pro digital speedometer. Motogadget also supplied the grips, bar end mirrors and ‘m.blaze pin’ front indicators, and just ahead of the carbon LSL bars is a Koso ‘Thunderbolt’ LED headlight.

The 17-inch wheels are featherweight carbon Rotobox RBX2 rims, which are around half the weight of typical OEM sportbike wheels. They’re shod with Pirelli Diablo Super Corsa tires, with a size boost at the rear—going up from 160 to 180 section.

The XSR700 has a small rear hoop that can be bolted off, so Ironwood removed it and installed a replacement with a custom seat pan. (It’s the same approach that Hookie took with their XSR700 recently.) LED lighting is integrated with the new hoop.

The new seat was built by Miller Kustom Upholstery and right below are aluminum side panels from the British supplier Barracuda—who also supplied the license plate holder.

Yamaha’s parallel twin pumps out a solid 74 horses, which is plenty enough for a bike that weighs just 186 kilos (410 pounds) wet. So Arjan has left the internals alone, and improved the breathing with DNA pod filters (with red leather tops).

He’s also plumbed in MT-07 headers hooked up to a stubby Ixil SX1 stainless steel exhaust system, which weighs a mere 3.9 kilos.

The biggest visual transformation is the new tank—which is a full unit, not just a set of replacement covers. It’s a masterpiece of shaping from aluminum specialist Marcel van der Stelt, who also created the new front fender.

The stunning grey and vermillion paint was shot by Jacco at Royal Jack, one of Holland’s top custom painters.

It’s a brilliant transformation and one of the best XSRs we’ve seen. So is this a new direction for Ironwood? Not quite: Arjan is not yet ready to abandon the custom BMWs that made him famous. “We would like to do a wider range of bikes—a healthy mix of vintage and ‘modern vintage,’ if you will,” he says.

“The majority of our production is still oldtimer airheads, due to our Deathstar series. We make 10-12 per year on commission now, and there are always three or more R80s and R100s in the shop.”

“Vintage bikes have their charm, but box-fresh bikes (or even electrics) are something we want to explore and learn about. It’s about challenging our team as well as keeping on with older boxer transformations.”

Arjan is already a brand ambassador for Husqvarna, and he’s open to collaborations with manufacturers too. And much as we love his BMWs, we’re hoping this XSR700 is an exciting taste of things to come.

Ironwood Custom Motorcycles | Facebook | Instagram | Photos by Paul van ML

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