Hi ringsrum, I have a GM454 at the winding, which runs, but by no means as it should – too little power and restless running. The temperatures measured at the manifold pipes (each at the same place of the arc) are after a few minutes idle between 320 and 350 °C … only on the cylinder 6 not, there are only 160 °C. Candle face a little darker than the other, but not much. Compression on all cylinders approx. 10bar, ignition time and adjustment checked, carburettor agreed, Idle set, checked for false air, new candles, new V-cap and fingers, ignition cable crossed, valve stroke on all valves approx.10mm, E-valve shafts only minimally coked … I don’t know what option I still have. Does anyone have another idea? Thanks in advance – joe