Hi Wayne , steering on these is always an issue, the linkage setup is a bit primitive and the fact both rear wheels drive at once means tight turns are a problem. As for the bike motor I assume you are not planning on using it with a cutting deck and running the drive by chain to the rear axle?
250cc should have plenty of power because you can use the gearbox as opposed to the direct drive of the original design, just think ATV's they don't have big motors

Last edited by NormK; 18/04/19 07:15 AM.