for APRILIA DiTech 41,0mm pin =12mm Grade B – decent repair Product description It doesn??t always have to be a new cylinder… if your scooter has a couple of thousand miles on it, piston rings and perhaps the piston should be replaced to regain respectable compression. Pistons from Italian original equipment . rm METEOR are a bargain, so that you can easily afford to put in new ones. Cast aluminum / 40mm bore. Measurements, performance and optics are identical with original pistons. comes complete with piston rings, piston bolts and clips. European wide homologation remains, original head can be kept, exhaust and carburetor don??t have to be modi. ed. -TIP! New vario rolls, new spark plugs and new cylinder seals. OEM numbers (for comparisons): AP5RER000084 (PIAGGIO)