So I bought one of these off a guy who bought it, laid it down, didn't ride again. I did my usual once over: oil change, air filter, spark plugs, and it needed battery, been sitting over a year. Oil was milky which makes me think head gasket, there was oil in the air box and the spark plugs were black but maybe in a running rich kind of way. Put fuel cleaner in and it smoked grey/white and heavy. Looking for guidance. Work on cars usually not bikes. Milky oil is ALWAYS bad, but not sure of the pathways or where crossover could happen.