hi
just converted a stihl51av electronic to to spin clockwise .. Had to make a adaptor to house the new da ignition ( lighter ) and remove unwanted housings .. After getting it going it spins a 18/6 prop 5000 rpm ( a little bit under compressed ) but not too bad..Estimate it to be approx 27 cc is all the info I can find still to confirmed.. Ignition cost $220.00 money well spenteasy to convert...