Sport Rider Photos
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After the original build didn't result in the horsepower numbers we were hoping for, Andrew had the head ground to increase compression while the engine was apart to change the valve springs. Because the squish band is level with the head's surface, shaving the head doesn't affect squish clearance. We needed some rocket fuel to deal with the high compression, and VP set us up with U4.2 for WERA races, but the oxygenated fuel is not legal for AMA. For Infineon we used the tricker (and more expensive!) AMA-legal MRX01. The U4.2 costs $70 for a five-gallon pail, while the MRX01 costs $115.
Triumph Daytona 675 Increasing Compression