The RussMeister is correct, i have an 05' Ktm300EXC and i love it, if you are riding in the bush its the way to go mate. Gearbox ratio's are all wrong and suspension is way too hard on an MX bike for the bush unless you are riding very hard to make it work. they were the go in the 80's as Jap trail bikes were crap then compared to the euro stuff or MX bikes.
i used to trailride a CR250 with full rego up until i got the KTM. i found it so much easier to take off on steep hills as first gear on the 300 is much lower than the CR was. my back was no longer sore after a decent ride of 130+ Km's and i enjoyed it much more. the 300 goes hard if you want it but the motor is so grunty you find yourself short shifting everywhere (as you should on a trailbike).
as a matter of interest Russell, did your KTM400 do the big end in? i have a mate that had this go on his a year ago (2000 model KTM400) cost him a shit load, so beware.