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I just purchased a new Harbor Freight 212cc engine i bought a thinner copper gasket ".016" thick I have already removed the governor. Should I break the motor in with stock head gasket or pull the head off and put the new copper gasket on,and then break the Motor In?

Im looking to buy a used kart for for some Street fun. My brother and i are going to build a small dirt track on his property at some point.i have been looking for something i could take on the dirt track oval as well at some point.im looking at a go kart that has a tag leopard 125 cc engine...

I have a 212cc predator engine that I did some modifications to.machine shop bored the cylinder.Billet connecting rod,flat top piston.smaller 14 cc head, 275 cam.How should i break the new motor in? Rpm's.

I am doing a few modifications replaci replacing stock cam with 265 lift, billet connecting rod same length as stock : molly push rods. Valve train upgrades are 26mm intake 24mm exhaust.,1.3/1 rockers, 18lb springs,.060 shims for springs.my friend is polishing and porting the head.how much...

Found an old go kart.use to work at a machine shop.fun tearing apart engines and make em fast .looking for advice. Seems like a decent place to start.