We dont get many Maytags, ive only seen a Maytag single once on EBay and they wanted a small fortune for it.
I havent seen of or heard of the other engines you mentioned. We do however have available many 98cc Villiers Midget engines, also 125cc and 160cc Victa engines from lawnmowers. We also have Briggs and Villiers 4 stroke engines.
There are a number of other cool engines, ive been trying to track down a Howard 8, which were used to run rotary hoes. They are fairly rare from what i can gather. There is actually a Howard 8 on EBay now, unfortunately the current bid puts it out of my price range. But ill keep looking and asking. The Howard 8 would be ideal for a boardtracker IMO, they also make a Howard single cylinder and a Howard 12 which is an uglier looking water cooled engine.
Here is a howard 8 minus the cooling shrouds..... looks similar to an earley Harley V-Twin, dont you think?
Here is the EBay link...... if any cashed up Aussies are reading this get ready to drool!!!!