This is from the site Bring a Trailer (https://bringatrailer.com/) ...
This 1949 Vincent Rapide is a Series B model that was previously owned by longtime Vincent Owner’s Club member and motorcycle racer, Jon Ulver. Finished in traditional black and gold, the bike is powered by a 998cc V-twin paired with a four-speed gearbox. Equipment includes twin 2LS front brakes, a Black Shadow speedometer, aluminum rims, black-painted engine cases, and more as outlined in the listing below. The seller has added approximately 1,200 miles since acquiring the bike in 2017. Maintenance performed over the last two years included refinishing the fuel tank, as well as the installation of new aluminum fenders, a BTH magneto, AMAL carburetors, and a set of Avon tires. This Series B Rapide is now being offered with service manuals and a clear Oregon title.
A new Vincent-HRD insignia and gold pinstriping were applied to the fuel tank after it was chemically stripped, internally sealed, and refinished last year. New aluminum mudguards have also been installed by the seller, along with a larger aftermarket saddle.
Aluminum rims measuring 19″ up front and 18” in the rear are laced to the drum brake hubs in place of the 20″ and 19″ rims installed at the factory, allowing for better tire selection. This Series B example is equipped with twin 2LS front drum brakes and a Brampton fork. An upgraded hydraulic shock for the rear has been added.
A 5” Shadow clock was installed under previous ownership. The odometer currently shows 41k miles, though actual mileage is unknown.
The engine was reportedly rebuilt with a Maughan & Sons crankshaft and updated clutch during previous ownership. New stock-specification pistons and liners have been installed by the seller, along with a set of new AMAL carburetors, a twin throttle cable arrangement, BTH magneto, and an electronic voltage regulator.
Sometime in the 1960s or 1970s, the bike was converted to resemble a Black Shadow, and a ‘B’ was stamped onto the end of the engine serial number. The ‘B’ has been removed from the casting, though the black paint remains on the engine cases. Closeups of the stampings on the engine (F10AB/1/1751), upper frame member (R3651), and rear frame member (3651) are provided in the gallery below.
An assortment of parts and service literature accompanies the sale.