I swapped the engines over and got the I/C engine going after adjusting and lapping the valves aswell as giving it a tidy up. It runs good at high revs just below the choke but at low speed it doesn't want to idle and stalls before I can get to the stop switch, I have tried the mixture screw but cant get anywhere it seems to be possibly a linkage or governor issue but I can't put my finger on it as I have the same engine on my mulcher and the setup is the same and works fine. What am I missing any ideas?
