三包有效期自开具发货票之日起计算 ,扣除因承担三包业务的修理者修理占用和无维修配件待修的时间 ,三包有效期具体为 :内燃机多缸柴油机整机为１年 ,主要部件为２年 ;单缸柴油机整机为９个月 ,主要部件为１ ５年 ;二冲程汽油机整机为３个月 ,主要部件为６个月 ;四冲程汽油机整 Warranty period from the date of issuance of invoice date, after deducting the three packs of business to repair the occupation of repair and repair parts without maintenance time, the three bags of valid period: internal combustion engine multi-cylinder diesel engine for one year, the main Components for 2 years; single-cylinder diesel engine for 9 months, the main components of 15 years; two-stroke gasoline engine machine for 3 months, the main components of 6 months; four stroke gasoline engine