Originally posted by stefan
usually there are always a few on Ebay.
today only this one:
STS RS3
ok, this is for those who can't tell between old and new STS engines (or whoever cares :-) ha ha )
The one on ebay (above link) is the "OLD VERSION".
One easy way to tell is :
crankcase old : black (dark), new : gun metal (light)
rubber piece on slide carb old : blue, new : black