Complete set of two Norton Ultra Hi compression domed pistons for racing fuel 750 to 850cc
These JE domed pistons to give you approx 11.3:1 C.R. for 750cc long strokes and 750 shortstrokes (more info). 73mm = 185 grams. 77mm = 210 grams. For racing fuel only. A drop in kit with no modifications except that bores greater than 78.5mm will need larger diameter combustion chambers. Includes rings, clips and .708″ DLC pins. Must be combined with our longer rods. Not recommended for 850s and up unless using alcohol (approx 12.5 to 13:1 C.R.). Will work for gasoline 850s with combustion chambers larger than 51cc (approx 12:1 C.R.). Crank rebalancing is not required (balancing info).