Complete set of XP pistons V3 70.75 mm - 860 cc

Complete set of three 70,75 mm XP forged tuning pistons - Generation 3. The Generation 3 pistons is forged by Wössner in a high silicone alloy to reduce the termal expansion so that a smaller piston play can be used making the engine less noisy when cold. The generation 3 pistons is also about 10g ligher than the gen 2 pistons. These pistons can often be used in engines that are already bored to 70.5 mm as the increase in bore of 0.25 mm often will clean out the cylinders. 3 mm lower from center piston pin to piston top. This gives an built in exhaust and transfer ports increase by 3 mm and you lower the bottom of the ports reducing the risk of grinding into the cooling galeries. Approved for Vintage Racing.