Apparently Jap are working towards building a big V twin, here is a prototype
Someone bought the rights to the "Jap" speedway motor & is going to produce a V twin by joining two motors (I guess barrels & heads) into one crankcase.
JAP 1912-1913 V-Twin
www.cybermotorcycle.com/gallery/jap/JAP_1912-13_V-Twin_1.htm
Just realised this bike is a Brough Superior being built as a proto for a new bike line in the old dart, but I do not think it will get there as it is being developed by a bloke out of his shed.
