A prototype of the famous Indian 648 Big Base Racer, this bike is claimed to be #3 of 13 pre-production models, according to the seller.
The Big Base name came from a larger oil capacity/bigger sump. This was determined to be necessary to deal with the additional stresses of racing, so Indian modified the bike to help with reliability. Modifications included a cast steel flywheel, and roller bearings from the Sport Scout. It was a successful race bike that had a 40 year long career. For more on the Big Base racer, check out details from this listing of an official factory racebike that sold at a RM Auction for $165,000.
This specific Indian 648 Big Base Racer (VIN: EXP3 HB) was restored years ago and since spent its time in private museums. It was apparently last run 5-6 years ago. The seller gives a story of Bobby Hallowell, a friend of Steve Dupont, the individual who developed the Big Base bikes. According to the seller, 13 cases were cast before factory release, and this is #3. Only about 30 factory racers were eventually built, and this is one of the very few (maybe only?) remaining prototypes.
Find this Indian 648 Big Base Racer for sale in Plainfield, New Hampshire with bidding up to $5,665 and the reserve not yet met