is there a modern alternate engine to use on the alsport tri sport stree legal, that has same power and rpm that would fit on the frame that may be 4 cycle instead of 2 and is electric start..i have original engines that would need a lot of work and parts to get them running and have no idea who would work on them these days..have 2 sl's that need totally redone so it will be a winter project. new to this site..been reading posts all great keep up the good work