I own one of these rotary mowers its a sachs km3 about 1972 on a masport body of around the same year. i have done a port job to ova lap the intake and exaust this gives it a pulse it screams with flames owt the exaust i wouldnt call it a bridge port because these are a 2 stroke set up with a percentage of ful air mixs cums thru the crank case witch has roller bearings i dont know how urd get away with a pp port bcause of this i love using mine and would only part with it 4 the rite price or id rather hold on to it with my collction it so cool.

Last edited by wayde; 07/02/13 09:43 AM.