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What's What? H-D Race Bikes 
KR and XLR Manuals XR 750 and XRTT Manuals
Technical info on KR and XLR Technical info on XR and XRTT
Technical info on KR Cams
 WR KR Parts List, 1952/57 Ancestors
1 2 3 4 5 6
"KR style" Twin Carb Manifold Other H-D racers
Harley-Davidson Patents   questions and answers...
KR and XLR Gear ratios 1, 2, 3 and 4 Gearbox Part Numbers