RE: OS .28xz
i havent read of anyone fitting a pullstart. The xz is specifically designed to be bump start 4 racing. If yor guna race i wouldnt want a pullstart, a bump box way easier. The os doesnt have crazy tight pinch so a bump box copes very easily. My os28 has had many many gals thru it, very easy to start, tune, heaps power, i hav only replaced the bearings recently.