I just built one it started right up but know power really . Just real weak so I let it run idled perfect rev up good .Shut it off.Next morning it wouldn’t start.Check for spark got it, found oil between head with a paper towel, so change head gasket didn’t help tho. Dam exhaust gasket blew out that’s why oil was between head.So it still wouldn’t start.Check carb now it’s brand new there was a bunch of dirt in bowl and jet was clogged. Cleaned good with carb cleaner. Installed new jet.Started right up. There’s a filter In tank a filter in line and my carb has a filter go figure.