The SPEED TEC EXPERT genuine Zenoah 30,5 cm³ engine is optimized for performance with sophisticated craftsmanship and guarantees, besides greatly increased performance, excellent workmanship and stamina. SPEED TEC EXPERT version modifications: Cylinder: Adjustment of compression; enlarged ports, fuel management milled, machined and polished exhaust and intake. Piston: weight reduced; skirt shortened; oil rings, piston above and below piston ring tapered and piston dome ground. Crankshaft: The Zenoah 30,5 cm³ SPEED TEC Expert comes with the genuine Zenoah +2 mm stroker crank #577953101. It is adjusted, aligned and balanced. Flywheel: weight reduced and checked for runout. Gaskets: use of premium quality gaskets.To achieve the optimum performance gain of a SPEED TEC EXPERT engine, we recommend the use of a tuned pipe ( to the tuned pipes ).

Race ported top end set for Zenoah G240, G270 and G290 engine.The SPEED TEC EXPERT genuine Zenoah 30,5 cm³ 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 EXPERT version modifications: Cylinder: Adjustment of compressionEnlarged portsFuel management milledModified exhaust and intake Piston: Weight reducedSkirt shortenedPiston above and below piston ring tapered and piston dome ground 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 EXPERT top end set, we recommend the use of a tuned pipe ( to the tuned pipes ).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!Please note: You also need the modified crankshaft # along with the SPEED TEC EXPERT top end set to convert a Zenoah 240/270/290 engine to 30.5 cc.