Does anyone know of someone who makes (can make) a 428 19 (or 20) tooth sprocket for the EX400 type shaft spline?I'm interested in using this new engine as a modern shifter kart engine in place of old 2-stroke motocross Honda engines. The price is right, and the power to weight seems reasonable for a new stock class that could run with the 125 and 175 shifters on road courses.However - all karting parts for shifters revolve around the 428 chain, not the 520. It seems simpler and cheaper to make 1 or 2 sprockets and keep the various 50mm (or 40mm) split 428 rear sprockets, than the other way around.Thanks in advance...Bryan