Original Iame piston for X30 and Leopard X30 piston with ring and circlips The dimension indicated for the X30 piston corresponds to the recommended dimension of the cylinder, taking into account the functional clearance. The green rating indicates a lower rating, typically 0.005mm less, while the red rating indicates a higher rating for a larger piston. Piston complete with elastic ring and band for IAME X30 (fig. N.52A). ATTENTION: The measurement indicated on the piston head (and which must be inserted first) is relative to the REED CYLINDER with the tolerance indicated on the right (recommended between 10 and 11 hundredths) - for example, a piston marked 54.15 will have an actual rating of 54.05. This piston is mounted on the following engines: - X30 125cc TAG Iame - Sudam 125cc -Leopard 125cc - Easykart (IAME) 125cc