I have an older Z with a Kohler 26 hp... When running is a beast. Would like it back for leaf season. Dealer said ECU was toast which I figured as much but now are trying to sell me a new motor... They said they took a ECU off a walker to put on my machine and said it ran fine. But now they claim Kohler doesn’t have that part anymore (new) and can’t find one anyway. Any experience with Kohlers, EFI, ECU or this in general is greatly appreciated..