I had the DX with bolt on down tube and no pedals - in Burgundy colour. Within a day or so had the head off and placed it on Emery paper on the floor hoping to shave some metal off to improve compression ratio 😁 Never noticed a difference. then I had it bored out to 75cc and sports exhaust. Didn't go any faster, made a lot of noise and seized twice on the way home - fun days!