You can spray the internals with brake cleaner if you want, just make sure to repack the front and rear bearings with grease, as well as a thurough spray down with WD40 of the internals as you assemble it, this will provide start up lubrication till the oils in the fuel relube the engine.

Oh yeah, it'll smoke real bad for a little bit too as it works the WD40 out of the engine.