I want either a yamaha or honda dirt bike. I want a 450 four stroke. I have a yz250f 2001 yamaha. One thing I do not like about my yamaha is that it seems like it needs to be rebuilt a lot, and it is a lot of work. I was wondering if the rebuild on a honda is any better. My dad had a honda 3 wheeler that in order to adjust the valves you just use a tool, no shims or anything. I was wondering if honda still does that on their dirt bikes. I want a fast low maintenance bike, if that makes sense. does yamaha trail bikes have less maintenance?