Hi Matt,
if the engine is still seized up, you need to take the size pannels of the engine and paste two stroke onto all you can see, this will give the bike moisture inisde again , because it hasent been used for a while the engine has sezied up so has stuck together so to speak, if the oil stil doesnt to the trick, but some ordinary anti freeze yes anti-freeze this wil release any dirt of stickyness on any of your internal engine parts, hope evrything works out
darren
May 2008