Flying Triple: BMW K75 Custom

BMW K75 Custom

Three-cylinder Flying Brick from Black Cycles Australia… 

The BMW K75 was the 750cc triple-cylinder variant of the company’s K series “Flying Bricks” — nicknamed for the distinct layout of their inline engines. The company wanted to get 75 horsepower from the engine, meaning it would have to make ~10% more power per liter than its big sibling, the 90-hp / 1000cc K100 — a feat accomplished through a higher compression ratio (11:1) and modified combustion chambers.

BMW K75 Custom

In the end, many riders ended up preferring the K75 triple — it was lighter, nimbler, smoother, and ran cooler than the four-cylinder K100. It was also the cheapest BMW motorcycle available at the time, and remains a good used buy, capable of racking up 100,000+ miles without issue.

“Whether thought of as an 80s technological marvel, the ultimate cheap tourer or superlative winter hack, the mystery about the BMW K75 is why everyone doesn’t have one in the shed.” –Classic Bike Guide

Today, BMW K100 customs have become quite popular, though we don’t often see the same treatment done on the K75. Enter this ’96 K75 is from one of our favorite builders, Noel Muller of Black Cycles Australia, who has a knack for turning just about anything into a truly special machine.

BMW K75 Custom

The bike was built for Ben, a new client who grew up with the owner of the highly popular DR-Z400 street tracker we featured earlier this year. Noel estimates they pulled some 75 pounds’ worth of bodywork, luggage, and electronics from the original touring machine before cutting off the rear frame to fit the billet subframe and shock-linkage kit.

BMW K75 Custom

Chris at XXX Rated Suspension professionally lowered the forks 80mm, and other highlights include a Jax Garage billet top yoke with Motogadget mini speedo, handmade overflow tank and radiator shrouds, ceramic-coated header, remote start, and a massive rewire handled by Justin from Popbang Classics. Then there’s the paint, more battleship than flying brick:

“The tins were painted in-house in Audi Nardo grey, to which we added nearly 40% of the dark bronze used to paint the wheels and engine side covers.”

BMW K75 Custom

Below, Noel gives us the full rundown on this triple-cylinder ‘Brick.

BMW K75 Cafe Racer: In the Builder’s Words…

BMW K75 Custom

Around five weeks ago I had Ben contact me saying he actually grew up with Joey, who owns the “Ride the Lightning” DR-Z400 featured on BikeBound recently! He asked if I could build him a very similar bike, but I’d already said to Joey his was the last one of these I’d build!

BMW K75 Custom

So I said to Ben: If you asks Joey and he agrees, then I’ll build one more. Well, Joey said “NO” mine is the last, get something different ????

BMW K75 Custom

So Ben asked if we had anything on the go? And luckily we happened to be already into a 1996 BMW K75 build (which from then on belonged to Ben)!

BMW K75 Custom

The bike was purchased as an all original beast, it even had the security tape stereo in it (working)! Well, ALL of that gear was removed and given away. I’d modestly say we’ve removed around 35 kg of original panels, panniers, electrical, ABS, etc.

BMW K75 Custom

Next step was to completely cut off the rear section of the frame. We then fitted the billet subframe & shock linkage kit including the adjustable YSS shock.

BMW K75 Custom

Then it was time to build a complete seat base and seat. The main (and only remaining ECU) was attached under this seat pan, along with the Motogadget keyless start sensor.

BMW K75 Custom

Forks were completely rebuilt and lowered 80mm by Chris at XXX Rated Suspension. Now running Sportster-style fork gators and a Jax Garage billet top yoke and some clip-ons bars. Also running Motogadget mini speedo, bar-end indicators, and glassless mirrors…

BMW K75 Custom

We decided to keep the original switch blocks as they are laid out similarly to a V-Rod, which Ben has, so a bit easier switching bikes. We also ran a V-Rod-style laid-back LED headlight.

BMW K75 Custom

A handmade aluminum overflow tank was built to fill the void at the front of the engine, and we also made some shrouds to cover the radiator sides.

BMW K75 Custom

GSX-R1000 rear-sets were used, and 12mm aluminum adapters made to fit them.

BMW K75 Custom

Some “faux” velocity stacks were fitted above the fuel rail on a custom-built aluminum mount.

BMW K75 Custom

The original exhaust headers were ceramic-coated by Competition Coatings. A cone-shaped 30cm muffler was heavily modified to fit as well.

BMW K75 Custom

A custom-built rear-mounted number plate bracket was made using Motogadget and Highsider lights and reflector.

BMW K75 Custom

A smaller battery was mounted on its side in the original position using custom-built mounting plate and bracket.

BMW K75 Custom

We also used @helperformance brake lines all round, while Continental tyres do the ground work duties.

BMW K75 Custom

The tins were painted in-house in Audi Nardo grey, to which we added nearly 40% of the dark bronze used to paint the wheels and engine side covers.

BMW K75 Custom

Carman’s Auto Trimmers handled the seat in a close grey. Justin from Popbang Classics then handled the wiring.

BMW K75 Custom

He completely rewired it and reduced the mountain of wires down to around 25% of the factory original, which deserves credit as NO auto electricians want to touch the K models ????

BMW K75 Custom

The bike starts, runs, rides, handles, and stops beautifully!

BMW K75 Custom

Ben saw the bike for the first time on my Instagram page (as he lives over 1200 km’s away). I can’t actually repeat what he said in case small children are reading this ????… But safe to say he’s stoked.

Follow the Builder

Black Cycles Australia: Black Cycles Australia | @blackcyclesaustralia

More Black Cycles Builds


BMW K75 Custom Flying Triple: BMW K75 Custom - Three-cylinder Flying Brick from Black Cycles Australia…  The BMW K75 was the 750cc triple-cylinder variant of the company’s K series “Flying Bricks” — nicknamed for the distinct layout of their inline engines. The company wanted […]
Suzuki DRZ400 Street Tracker Ride the Lightning: Suzuki DR-Z400 Street Tracker - Black Cycles Australia builds a 400cc street tracker…  Introduced back in 2000, the Suzuki DR-Z400 remains still one of the most popular dual-sports on the market, boasting an especially strong aftermarket and rider community.  While […]
Dyna Cafe Racer Speed Train: Harley-Davidson Dyna Café Racer - Big Twin Café Racer from Black Cycles Australia…  The Harley-Davidson Dyna Super Glide (FXD) boasted a monster 1450cc Twin Cam 88 V-twin that cranked out 67 hp and a stump-pulling 86 lb-ft of torque at […]
Harley Nightster Scrambler The Night Scrambler: Nightster 1200 Scrambler - The Scrambler We Wish Harley Had Built… Introduced back in 2007, the Sportster XL1200N Nightster was a blacked-out, lowered version of the regular Sportster — something of a “factory custom.” Though it was mainly an […]
Ducati 250 Cafe Racer Dreamy Duc: 1971 Ducati 250 Café Racer - Black Cycles Australia builds a 250cc Ducati café racer… Starting in 1950s, brothers Joseph and Michael Berliner of the Berliner Motor Corporation were the US importers for Ducati and many other European marquees. As the […]
Super Special Magazine Super Special Magazine: Issue 37! - We’re thrilled to have two articles in the new issue of Italy’s premier custom motorcycle magazine,  Super Special. One is the 1950 Triumph Preunit from Noel Muller of Black Cycles Australia and Justin Holmes of […]
Yamaha Virago Steampunk Ratbike Steampunk Virago: Yamaha XV1000 Rat Rod - Black Cycles Australia builds a “Steampunk Rat Bike”…  The rat bike has a long and storied tradition in the motorcycle world. Rat bikes are generally hard-ridden, uncleaned machines with plenty of rust, patina, road grime, […]
Turbo Ducati Italian for Blown: Turbo Ducati 916 “Soffiato” - Black Cycles Australia builds a Turbo Ducati!  In 2001, the Ducati Monster S4 was the first of Bologna’s beloved Monsters to receive a liquid-cooled L-Twin heart transplant from the superbike side of the factory, and […]
Honda CBR600 Street Tracker Honda CBR600F4i Street Tracker! - Black Cycles Australia builds a CBR street tracker…  Historically, the 600cc sport bike class has remained one of the most competitive segments of the market, where race-replica supersports perform double duty as sharp-edged track weapons […]
Triumph Preunit Bobber Australian Triumph: 1950 TR5 Bobber - Black Cycles x PopBang Classics build a Pre-unit Bobber…  In the first half of the 20th century, the traditional way to build a motorcycle involved bolting together a separate engine and gearbox via a third […]
Ducati 400 Cafe Racer Duconda 400: Honda-Ducati Cafe Racer! - A Japanese-Italian love story from Black Cycles Australia…  Introduced in 1977, the Honda CB400T was the successor to the CB360. Better known as the Honda Hawk (US) or Dream (UK), the twin-cylinder CB400 offered a […]
KTM 300 Street Tracker Two-Stroke Ripper: KTM 300 EXC Street Tracker - Black Cycles Australia builds one rip-ready KTM two-stroke…  The KTM 300 EXC is the company’s flagship enduro machine, a 293cc two-stroke off-road weapon with a race-winning blend of weight, balance, handling, and power: “Lightweight, great […]
Yamaha XT500 Restomod Streamlined XT: 1980 Yamaha XT500 - Black Cycles Australia builds a streamlined XT for Retromotive…  If you’ve been following BikeBound for any length of time, you know we’re big fans of the Yamaha XT500. Not only did the 500cc single win […]

Leave a Comment

Your email address will not be published. Required fields are marked *

*