people still go up to the counter, pay [for] their orders. apparently the problem is much more severe for modern jet engines which burn hotter than the older ones. also i feel very bad for the bike) anyway, i can't decide whether i should get a 250 4 stroke or a 450. i am told that the 250 is a very large increase in power and i don't doubt it is, but i feel that i may be too big for one and the 450 would have that extra bit of power a big guy like me would need. 