First thing to do is pull plug install wire and ground plug (threads) on engine and crank engine, do you have a bright blue spark and is it consistent? If so that part is good. Next pull valve cover and rotate engine by hand watching camshaft and sprocket until cam lobes point downward and 2 hash marks on cam sprocket are lined up with top of head. Use a skinny screwdriver insert in plug hole making sure piston is up. Now guide screwdriver with one hand while turning engine over with other hand 2 complete revolutions stooping when piston reaches top. ( turn engine, screwdriver will drop than rise than drop again than rise). At this point look at cam and sprocket making sure lobes point downward and marks line up with top of head. If good timing is OK, put valve cover back on. Engine still on TDC loosen the 2 adjusting screws, slightly move adjusters in towards each other than move out away from each other until you feel resistance. At this point you have 0 clearance now move each adjuster inward 1/2 of a mark. Now your valves are adjusted. If you have a compression gauge run a compression test. Top compression should be around 150-160. If all this checks out to be good than you know your engine is in good mechanical order. Next you need to drain the fuel tank and remove and clean if necessary, change the fuel filter. Pull carb, carefully disassemble and inspect, clean carb. Best is to use the dip (Berrymans; found at Walmart or most auto stores appx. $13.00). Also inspection of plug itself, black shinny carbon or gooey black means using oil, flat black powdery carbon means running rich, tan to brown is good. The green wires soldered are various grounds, just make sure all wires are bonded tightly. Check each wire and if any are loose re-solder and tape up. Use nothing but non ethanol fuel.
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