CR50 bicycle engine kit Bore & stroke: 40x40mm=48cm3, petrol oil mixed engine oil, sparking plug, power. Rotary speed: 1.15-1.6 kw / 8000r / min, 1.6-3 horsepower / min, speed: 50-60km / hour, we go through the ISO9002 certification, and we assure 3 using year for our buyers. CR60, CRF70, CR80 type can be supplied. And you can aware our high quality as following: 1. First quality cylinder casting. Alloy with chrome liner 2. Dual Connecting Rod Needle Bearings 3. Japanese Engine Bearings 4. Chrome Intake Manifold 5. Chromed Gas Tank Liner 6. Brass Fuel Valve 7. Chain Tensioner Wheel with ball bearing 8. 415 Pitch Engine Drive Chain (#41 Chain Equivalent) 9. Alloy Clutch Lever with hold open catch (new style) 10. Engine Kill Switch mounted on throttle 11. 9 Hole 44 Tooth Drive Sprocket 12. Chrome Exhaust Silencer 13. Strong packaging (double boxed), Shipped in steel framed pallet lined with cardboard sheets and cling wrapped