I recently sold my Honda XLR 250 Baja, must say I quite enjoyed the bike. About 25Kg lighter than the 250CRF and 4Kw more power as well as slightly more torque, 6 speed with decent suspension. Think it is a good buy if you can find one. Kick start only though.
Macker, I used one long ago for a YZ. As Kortbroek mentioned, remove the chain and also don't turn to sharp, or try to reverse. Not good for the tyre over long distances. Does your front wheel touch the rear door?
I don't think a TW is very comfortable in ruts and sand. How available are those chubby tyres? You probably have a bigger chance of a puncture with a fat tyre.