The decline and demise
the mid-1930s, JAP’s prestige (and its profits) was slipping. Although their engines continued to enjoy successes, record breaking at Brooklands, sprinting, grasstrack, sand racing and, of course, speedway, dwindling sales were further hit by JAP’s poor showing at the 1934 IoM TT and the drubbing Phillip Vincent gave the JAP race engines he’d used for his Senior entry Vincent-HRDs
