Actually like B says both bikes are fantastic, and I can understand an argument for having each.
I have a
Mito, and it is truly one of my favorite bikes. When I first got it fully running I liked it a lot, but it wasn’t until I became a better rider, by working hard on the Derbis, that it really turned into one of my all time favorite bikes. It is better made than the Derbi in most ways.
They are two strokes, and come with all that it implies—you do want to maintain them. They are fairly easy to work on. A bit more complicated than the Derbi since there is a power valve. The seven speed gear box is great. Even still I try to go to eight once in a while.
On mine I put a 28mm carb from a KX100 Kawasaki. At the time it was the easiest way to get a PKW carb in that size. Now there are lots of companies that make PKW copies is 28mm, so they are readily available. This made the bike much easier to tune, and way more ridable on the street. It also has the benefit of putting less stress on everything, thus ensuring a longer lasting package. I did leave the autoluber on it.
I don’t ride the Mito as hard as the Derbis, because you don’t have to ride it as hard. But I suppose you could ride it hard. The problem is that it is fast enough that it could get you into a lot of trouble quickly.
In general I’ve found the people that have Mitos tend to be more passionate about them than the folks that have the RS. Not sure why that is, but it seems to be the case. I haven’t tried to buy parts for mine in over ten years so I don’t know what it would be like today. Wisco probably still makes pistons for them—that’s what I have in mine. Top ends are probably becoming rare.
The RS is a great bike too. If you find either one you’ll probably be in love with it.
