Just wondering, two tecs H35 one is 1978ish other 2000, old one has 5\8 shaft other 3\4 now is the torq different on these two? I used the cam and carb off the 2000 on the old one but seens that it just struggles to drive the tiller unless its over reved, the old one had the diaphram type carb, and its APITA to try and get the newer carb set , has to run 4000 plus rpms to get any power, now the older one Im useing has very few hours the cross hatch was still there, I used it for about an hour to till but just isnt right , tried adjusting the gov but that was no help eather ED