This 38mm cylinder, piston, and gasket kit is designed for Simson 50cc engines.It serves as a replacement component to restore engine compression and function in the event of cylinder damage, low compression, or piston seizure.The kit includes a 38mm aluminum cylinder, an anodized piston, piston rings, a 12mm steel wrist pin, two circlips, a cylinder base gasket, and a cylinder head gasket.This set contains the components shown in the product images required to rebuild the end of the engine.It fits standard bore applications and installs directly without modification.Compatible with Simson mopeds, mokicks, and scooters equipped with 3-speed and 4-speed engines, including models KR50, KR51, KR51/1, KR51/2, S50, S51, S53, SD50 Albatros, and SR50 Automatik.Please compare your existing parts with the product images to confirm fitment before purchase.This item is an aftermarket accessory compatible with the listed vehicle models and is not an manufacturer part.