Mod engine question

[T@AFP]

After riding my son's 65 mod, my daughter just decided that she wants to convert her Pitster 125 to a 90 mod. She has been struggling w the 4 stroke all summer. She had recently started riding the lil 2 stroke and what a clear decision. WAAAY smoother on the 2 stroke.

So my question is which 85?

I know alot of people prefer the KTM over all of the them. But I think I would rather do the CR or the RM. Just because of parts available at the races.

[mini racer #39]

tom hey its jerry GO with the rm motor erik has smoked 2 crs in three weeks