I just bought a Boom 500, We took it for a 60 mile trip and could not get it over 50 miles per hour. When I talked the last owner about it she told me that it has had the same gas in it for two years{full tank}. I took it to a cycle shop and they just told me to put sea foam in it. I did and it started to run worse. I could hardly get it out of the drive way. A friend who works on bikes took it home and drained the tank and cleaned the lines and filter. He also cleaned the air filter and spark plugs. It starts better and runs a little better but it is still not right. Any advice as to what to check or where in mid Missouri or KC area to take it to have it looked at.