请教一些汽油机或摩托/割草发动机的问题

1.是因为看到harbor 13HP发动机的反馈：“Purchased this engine,took it home and mounted it in a atv I built. After filling engine with oil,I noticed a silver shine to the new oil. Since I build racing engines, I pulled the crank case bottom and found a bunch of metal fileings ,so took hole engine apart. the piston rings are a joke,and so was the cylinder hone,and vale job. just to see what I could do, I rehoned the cylinder, put honda pistons rings in it, and side polished the rod with arp rod bolts. to make a long story short and with the help of a high lifr cam, the engine now runs at 4500 rpm, and is making over 20 horse power. I have run the engine very hard with no problems for the last 114 hrs.” 该人改造及用本田活塞环后机器提高到20马力！
上面的honed the cylinder， side polished the rod with arp rod bolts，high lifr cam我不懂，请赐教。

2.我知道摩托/割草发动机多为2冲程单缸用混合油，但不知为啥这类机器毛病多？我的割草机是本田引擎，每次拉绳发动都要好几次，风门调节在发动前没帮助。似乎要化油器里有层油雾后，不多不少，才能发动。正确的启动和维护步骤?我忘了当初加油是否要混机油还是自动混的？清洗化油器的目的？

 

所有跟帖： 

• "honed the cylinder" 就是用磨石（三角形分布的三块）旋转打磨气缸内壁。 -史迷- ♂ (1039 bytes) () 05/26/2015 postreply 13:44:37

• 史兄好！多谢答疑。多年前见过用刮刀磨活塞环，不大懂。不记得有磨缸，嘎斯51。 -chinomango- ♂ (0 bytes) () 05/26/2015 postreply 23:02:41

• 割草机现在都是四冲程的了。化油器里面有陈油就buhao -二吐为快- ♂ (87 bytes) () 05/26/2015 postreply 20:56:22

• 我的是旧的，问的也是旧的；4冲程的化油器在汽车上是啥没见清理过？如何清理？ -chinomango- ♂ (0 bytes) () 05/26/2015 postreply 22:04:53

• 现在的汽车上木有化油器 -RoseBuilder- ♂ (0 bytes) () 05/27/2015 postreply 11:20:09

• 是，那四冲程汽油机5-20HP的还有吗？感觉启动问题多与化油器有关？ -chinomango- ♂ (0 bytes) () 05/27/2015 postreply 15:05:30