Okay I've built three of these two strokes. First was a flying horse and it had problems....ALL OF THEM. had to clean ports out replace the mag, cdi, head blown not gasket the head. Rings started to spin and crankcase leaked. All was fix and the people from the horse helped out good. Motor runs good now. King motor bike hahaha ha crap for service crappie for quality but did not have any major issues other the the jug and intakes being so burd up the rings could've snagged but... let me tell you this. I wanted one for me the others were a request after I built a bike for a old man. A four stroke BTW. I ordered the cheapest of the cheap and it came with all the same stuff the 200 dollar ones do. The goplus motor from amazon for 99 bucks 66cc. I just got back from riding 14 miles on a break in 20 to 1 mix. I went up and down hills in the country cut burn roads. Not one problem with it... On my last quarter mile I opened her up running a bit rich but I hit 42 mph and bogged. I turn the throttle back a hair and cruised home at a cool 35 mph. This kit is bone stock with minimal top end cleaning and no carb jetting. I can't believe this.....did I get lucky or is this what a cheap motor does?