The Lucky Cat Garage‘s Séb Lorentz made waves last year with his dustbin-faired Sprintbeemer. Designed as a “noisy, fast-looking sprint-bike to frighten competitors,” it won its maiden race—the StarrWars sprint at the Glemseck 101 festival in Germany.
Séb didn’t pilot it to victory himself though. Having broken his leg and ankle in a BMX accident shortly before the event, he handed over the reigns to his good friend Sylvain Berneron (better known as Holographic Hammer).
“I had a wonderful and amazing time at Glemseck 101 despite the pain,” says Séb. “People there are really open minded, enthusiastic and overall very kind. I committed to come back for the 2014 edition, to ride the Sprintbeemer myself.”
The original Sprintbeemer build is described in detail in this great article on Bike EXIF. In short, it’s based on a modified BMW R50/2 chassis powered by a hopped up BMW R100RS motor.
Other highlights include shortened R75/5 forks, a R100/7 swingarm hooked up to a rigid rear end, and a vintage M&H Dragmaster tyre on a 18” Morad rear wheel. Topping it off was an unbranded moped tank, a hand-made seat pan and an Airtech Streamlining dustbin fairing.
It was an impressive build, but Séb wasn’t satisfied. With the help of some friends, and the support of Edwin, Furygan and Shoei, he decided to make the Sprintbeemer faster—and more frightening. Or, as he puts it, “take it furtherer.”
The R100RS motor had already received a number of upgrades—such as bigger valves, Dell’Orto PHM 40 carbs, a 336-spec cam, a HPN ceramic clutch plate and a R100R gearbox. Nevertheless, it went off to Dirk at Edelweiss Motorsports for an extensive engine tune.
The cylinders, pistons, conrods, crankshaft, camshaft and cylinder heads all received attention, with lightweight rocker arms and pushrods installed for good measure. A digital ignition’s been installed too, and new mufflers mated to the existing Vattier headers.
Other parts from the original build that have been retained include a Scitsu tachometer, Menani clip-ons, a Domino GP throttle and a modified Mooneyes oil catch can. Joining those are an air shifter and a MRD shift light.
With more ideas than cash flow, Séb had a run of Lucky Cat Garage T-shirts produced and put them on sale. Before long, he’d scraped enough together for the mod that was highest on his wish-list: a NOS wet injection nitrous system. Since NOS systems aren’t installed on vintage BMWs every day, the set up is completely custom—including one-off brackets for the fuel pump and bottle.
The Sprintbeemer’s also been treated to a new, modified Airtech Streamlining dustbin fairing with an extended belly pan, and a Malagutti moped fuel tank, with integrated oil temperature and fuel pressure gauges. Séb’s friend Benny (aka Machine 17) painted both. The fairing’s adorned with a reversible triangle motif—intended to throw off competitors—while the tank’s been shot in candy red with the Lucky Cat Garage motto on the side: “Who needs 9 lives?”.
Séb’s mods paid off. At the 2014 edition of the Glemseck 101 the Sprintbeemer successfully defended its StarrWars sprint title, and took the gold in the BMW Motorrad BoxerSprint. It then went on to secure second place in the retro mod class at the AMD World Championships of Custom Bike Building.
He’s not one to rest on his laurels though—so I’m sure we can look forward to a new evolution of the Sprintbeemer in the near future.
Opening shot by Daniel Beres, all other photos by Aurore de Bettignies.