Hi ya'll, First China engine/bike build. Great site and have already learned a lot about what I should do to make my investment worth while. I had buyers remorse after some not so favorable reviews on these little imported engines. I feel better now that I'm more informed, thanks to this site. Bought a 49cc, Limited Edition from Powerking. Looks like it has some upgrades and hopefully I did well. The quality Japanese bearings probably did it for me, but not exactly sure it those are sleeve bearings or needle bearings. Hopefully someone here can enlighten me. I'm 60 yrs old today. Have ridden BMW motorcycles since '73. Have a '72 and'75, not running for several years since my back gave out. Many others before then.Semi-retired carpenter and archery bow tech.Like astronomy,guitars,old microscopes and now it seems I might have the motobike bug. Something I can afford on limited income. Looking forward to some fun and tinkering. Looks like I've found the right place.