AJT, The Kangke is NOT rated for anything more than a 1.8 gasser or glow. Neither will handle a 50cc (well might). That is why I bought the Dymond. The Kangke's are great kits of high quality. Do a search on the user "over worked" or "Kangke monocoupe". The same info from these posts goes regarding the Speedster from Kangke. Dymond says 25 to 35 cc for their speedster. I am using a Quadra 40 on mine (what I have without a home). The Dymond is also 4" bigger (span). Anything else just let me know.
Brian