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Firstly, JAP mostly used a fairly complex series of letters to identify their engines, and any special features.
See where we go with the numbers/letters to give a year ?? If you can find a (possibly long) series of letters anywhere there, it should go a long way to identifying it.
image provided by is a very attractive machine which is extremely rare anywhere in the world.
in france a pedal-start motorcycle like this is called a bma (""bicyclette-moteur-auxiliaire""). Frame - Flat tank, twin compartment, luggage rack and auto-tri - powered by a prototype 350cc anzani engine - was one of the first. and, in france, since the earliest days, there was a tradition of annual races of triporteurs through the streets of b.d.
The bike was aquired by an Austrian motorcycle museum in 1999. This was the model I-26, which has a 600 cc single-cylinder side-valve engine imported from JAP in London, England producing 15 bhp.
Production ceased in 1997 due to Vibration and noise regulations tightening up and with the number of units sold each year a redesign wasnt cost effective.
JAP supplied literally dozens of manufacturers with engines, so pinning down a precise make it was fitted to may sometimes be somewhat problematical. If it has numbers, they will give an indication of year.2ndly, looks 1920s, more later 20s.
Someone has done a lot of work fitting quite a sophisticated looking oilpump, and presumeably oiling system.
Subeam engines usually had a Sunbeam badge inset into the timing cover itself ? Likely to be quite a good performer because of it...
See where we go with the numbers/letters to give a year ??