Years ago, my son was racing go-karts. He blew up the last good engine that we had, and I didn't have time, or the $700, to have another one built for him. We took some parts that we had sitting in the garage from several old tiller engines and picked the ones that fit together the best and put a motor together. We were only interested in being in the race, not expecting to be competative against the high dolar motors. He finished 2nd that race, and almost won.
That really embarassed the competition!