Race ported top end set for Zenoah G260 engine.The SPEED TEC COMPETITION genuine Zenoah G230 race ported top end set is optimized for performance with sophisticated craftsmanship and when accurately installed - guarantees, besides greatly increased performance, excellent workmanship and stamina. SPEED TEC COMPETITION version modifications: Cylinder: Adjustment of compressionEnlarged portsFuel management milledMachined and polished exhaust and intakeThe case is specially matched with enlarged and polished cross section towards the ports Piston: Weight reducedSkirt shortenedOil ringsPiston above and below piston ring tapered and piston dome polished The set includes the following items: Performance-optimized cylinder and piston, piston ring, piston pin, piston pin circlips and cylinder gasket.To achieve the optimum performance gain of a SPEED TEC COMPETITION top end set, we recommend the use of a tuned pipe ().Each SPEED TEC Tuning cylinder set comes with a small amount of a spec. assembly lube for the installation of piston and piston ring. This spec. lube provides the required lubrication to the engine for the first start and dissolves without residue!