"I'm a newcomer to the site. I have an AQ140A that the previous owner spent quite a bit of money on recently. The fly in the ointment is the cylinder head, which is cracked and (I assume) not repairable. Are replacement parts available? I have been reading in the archives and one point of view is that I would be throwing good money after bad and should repower. On the other hand, this is a boat for fairly light summer use. The boat is an '80s Sisu and I'm not sure that the expense of repowering makes sense. Does anyone have any advice?"