... . bore and stroke 63.5x62.2/72x62.23. compression rating :9.2:14. max torque : 13.5Nm/5500rpm, 17.5Nm/5000rpm5 ... ,4-speed,reverse gear,chain8.Brake (Front/Rear):Drum /Disc 9. starting system :Electric start10. battery spec :12V,9AH11. front suspension ... - 8/21 x 7 - 1014. rear tires spec :18 x 9.5 -8/ 20 x 10 - 1015. vehicle dimensions :1800 x 1120 ...