Dirt Rider’s Community section showcases dirt bike blogs and interactive discussions in our dirt bike forums. Find information about off road riding locations, racing, news, events, parts, accessories, and more.
I wouldn't touch that with a 40' barge pole. I'd have your 2 smoke any day. The 450 is 9 years old now, the only difference between that, and a handgrenade, is the pin... Take note of the fact the owner wants to swap for a 2 stroke, there's a hidden message there somewhere... LOL
You could play with your 250 and set it up so it suits your needs better. A flywheel weight would smooth out the power and I suspect you could sort out the idle with some tinkering. Others on here are better qualified to give advice though.
It looks like you're new here. If you want to get involved, click one of these buttons!