1912 Indian Board Track V-twin racer. Board-track racers had cylinders ported to scavenge excess exhaust and crankcase pressure. Some factory racing machines were sold to public in both to defray expenses and encourage privateer entries.
Latest drawing: Our monster's driving a Brütsch Mopetta , which I first saw in this picture in Object's Top 20 Bubble Car list. What a lovely little car, what a fine little pipe chappie. Gosh, it makes a good wind-up toy noise, too: