I recently got a 1974 Hercules 2 speed manual moped with a Sachs 503 reed valve engine. The previous owner said he was relatively certain that the engine has some sort of a limit on it. As it is now - the moped reaches only around 20mph, and it reaches this top speed very fast - making it feel like it should definitely be able to go faster.
If there is a limit, and there is a way to take it off and make the moped faster, I would really want to do it.
I am a complete Moped noob as far as mechanics go (to the point of barely knowing how a carborator works (and all that i got from wikipedia) - but I really want to learn everything.
I tried looking as much as I could about Sachs engines, but with my limited knowledge I don't think I even know what exactly to look up.
Would anyone be able to throw some tips, guidances, links to guides, etc. Perhaps ask me questions on more information about the moped and engine (and how to find it, since there is no paperwork with it.)