The marriage of a KSS motor with the more current MAC rolling chassis was a fairly common practice that resulted in a far better platform for the OHC KSS motor. Classic Motorcycle & Mechanics tested one in July '92 and came away impressed with the combo. This example ('39 KSS motor # KSS9121 and '54 MAC chassis # RS7479) was built by a Velo expert in the Florida area during '91 and '92 and acquired by the current owner in 2004. He rode it occasionally over the next few years and decomissioned it for display in his climate controlled collection in 2008. He considered the machine to be a fine example with no mechanical issues.