Here is a photo of a 1934 Harley-Davidson CAC Speedway Racer. Joe Petrali designed and built 12 of these in the H-D factory on weekends when regular production was stopped and with his own crew.
There will be one up for auction at the Las Vegas auction Jan. 6, 7, & 8th, 2011. I have heard there are no more than 9 left, maybe fewer.
16.5 : 1 compression, 500cc. The JAP motor's where too strong and this bike was discontinued after one year.
Can't wait for my order, see ya!