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The XR-750 was introduced in 1970 to meet new AMA class C racing rules. It had cast-iron heads and cylinders, but was a stopgap measure. In 1972, the new, more powerful, more reliable aluminum alloy XR-750 debuted. It became the dominant dirt track racer through the next three decades. Dirt track racer Mark Brelsford won the AMA Grand National Championship on an XR-750 in 1972. - Buddy Stubbs Motorcycle Museum View Related Article
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