Virtually all modern crankshaft drives have a high quality needle roller bearing type in use as the small end or gudgeon pin bearing journal. These items are an absolute necessity in all tuned engine set ups, and now even in standard OE configurations. They ensure reliable and long-lasting performance of the engine. PIAGGIO offers SPINOTTO bearings in the usual size and in an oversize version. If a strange noise comes from the motor, try the oversize version, to avoid unnecessary play and additional wear. IN bearings PIN bring the needles to the outside. These bearings are the perfect choice for tuned engines. Conclusion: PIN bearings are not immortal and should actually be replaced from time to time. SIP-TIP: The tools #15194000 and #17820000 make the job much easier and less time consuming