Reply To: Douglas SV54

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Well I’ve taken the head off and had a look. Valves are working as they should. Timing seems spot on. The gasket is copper and is ok-ish few little spots of black carbon. Valves look OK. I suppose they might benefit from grinding. Don’t think any of that would account for zero compression though (correct me if I’m wrong). The only other thing I’m thinking is leaking past the piston rings. There’s no marks on the cylinder wall. It might have been “worked” on recently as the honing marks are clearly visible.

I suppose the only way I’m going to find out is to take the cylinder off.