Dont want to cause a argument but how will it be a lot cheeper? Rebiulds are pritty similar in time and price, a 2 smoker will burn up a lot of gas and oil. I quess any valve or cam work is the only thing i can think of that could make a 4 stroke cost more to have.
i dont really want to start an argument either.
but between that SPECIFIC 4stroke (NOT GENERALIZING) and that SPECIFIC 2 stroke... its the case.
a complete top end rebuild on a CR500 is about $200. thats boring, minor portwork, new piston and gaskets.
with regular, almost daily street use, it only needs it about once a year. the length of time a CR500 can go between top end rebuilds is VERY long for a 2 stroke. on top of that they're easier to do quickly (less parts to double check, no clearances, adjustments, etc.)
i have two friends with the SMR. its a VERY fun street bike, and im not bashing it at all.. but it does not work well for a bike that will have alot of miles put on it. they tend to drop off in power a good bit and need rebuilds more often.
you are correct that you'll spend more money on oil for the CR.. and that sucks... but you'll also spend more time working on the SMR and that sucks...
but when you are actually riding either one, they are both SOOO much fun that it doesnt matter.
the CR is harder to ride smooth, but that makes it seem even faster. its scary fun.
the SMR has a more linear powerband.. but at times doesnt feel as fast, even when its actually faster, because its smoother engine output.
they're both great bikes... but the CRcosts less to buy, less to maintain over time, parts are cheaper, and the only additional cost it incurs is the oil price... and that can be partially offset knowing you have to change the oil in the SMR more often then the CRs transmission oil...
thats why i say its alot cheaper... between the SMR and CR500.. NOT between the CR250 or a WR450 or anything else... just between the two bikes the topic is about.