The internal combustion engine has been around for a long time. Just when it seems like every part that could be optimized or improved upon has been already, something new comes out. This latest ...

When the 6.5 HP (212 cc) Harbor Freight Predator engine in his kid’s go-kart gave up the ghost after some particularly hard driving, [HowToLou] figured it would be a good time to poke around inside ...