I was just talking with my dad the other day about how cheap of a hobby riding is. Sure, there's the $2-3K initial cost you pay for a bike, plus a few other things like tie downs, gas cans, and maybe a few tools. But after that, unless you neglect the bike or do very hard riding on a small machine, you've only got to pay for premix (and at 30mpg+ that's no big deal), some oil for the transmission (which is far less than what you put into any car), and the occasional odds and ends that need to be replaced, usually things like grips, tires, spokes, etc, most of which will last five years or so. We've almost never had to do a top end, and I don't think we even once had to replace a clutch or transmission. A two-stroke motorcycle is just a long-lasting bastard, which is usually cheap to maintain and run. Even when we were doing model railroads, it was more expensive than keeping the bikes going. To take such a sweet and cheap deal and add frequent and expensive four-stroke rebuilds would just be crippling. If it were a matter of "four-strokes or nothing," I'd abandon riding and get a Dodge Challenger instead.
