Check out this crazy drilled Harley KR Racer! The caption above the photo reads: "Racing - weight is essential, or lack of it. This shows the extremes to which mechanics will go to reduce weight. Holes have been drilled in every possible area of an engine (without weakening it structurally) and possibly 2 pounds have been saved. For a long time this practice was illegal; it is legal now, however." Photo comes from a 1970 Motorcycle & Trail Biking Handbook.
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