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The crank looks like its designed for a car. How are these connected to a gear and flywheel?

Thanks for your replies, I do in fact have a vent in the petrol tank so it should not be that I am creating a vacuum stopping the fuel reaching the carb, but I do also have the carb overflow going back to the tank, it saves wasting any petrol in the boat or overboard, but I will try just venting...

Has anyone had problems with fuel starvation on the Zenoah 260PUM engine? I read in the engine instruction manual that the fuel tank should not be more than 100mm from the carb (Walbro WT-644). On my FSRV boat the tank is about 350mm from the carb. To get the engine running well I have to have...

Thanks for the advise guys, the general opinion seems to be that the MVVS does not rev high enough. I actually have a Zenoah 260PUM, I would doubt if this is revving more than 12,000 as it is in stock form, great engine but was looking for something a big lighter as I have to add quite a bit of...

Are you saying that you think it does not rev high enough to be efficient for a waterscrew? I guess 12,000 RPM is really the minimum needed for competition use.

I am interested to here from anyone who has used one of the MVVS petrol engines either the 1.6ci (26cc) or the 2.1cu (35cc) version. Not sure if they make a marine version of these but should be quite easy to add a water jacket and flywheel. From the specifications they seem to be lighter and...