Welcome to the addiction. That is an older Sunl which probably has the external reverse unit on it as well as the series B GY6 engine with the 2 bolt valve cover. The series B will be tough to find stock parts for and you can forger about performance parts to fit it. If not interested in performance you can buy a complete engine of good quality for around $325.00- 375.00. There are cheaper ones out there but buyer beware for there are several factories in China building the GY6 engine and some are good but some are bad as far as the quality of parts they use. If your looking to build the engine with a bit more power you can buy the series A short case already bored out for the larger cylinders. This route you can either go with a stock or stroked crank, performance head and cam. These engines are not hard to build but don't waist your time if it is the series B engine.
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