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Hello,
I have a 406 Cleveland (4.020”) with 62cc closed chamber heads (compression 11.2:1), roller cam 227°/235° at 0.050”, ICL 109”, lobe sep. 112°, +4° advanced. I have to use our high prized European 102 octane fuel.
I tried 98 octane fuel (which I still would prefer to use) but then it will sometimes run-on after shutting down (changed ignition total advance to 34° (14° initial) so it would not ping in low gear uphill).
If I would retard the cam to 0° or futher to -4° would this eleminate the dieseling effect running 98 octane again?

Thanks for you help!

Ralf

Have you pulled your spark plugs to see what they look like? I have heard sometimes if your plugs are fouled it can cause run on. If they are fouled, then you might have to adjust your carburetor.

Plugs (Autolite 24) looks good and are not fouled.

Answered you on facebook mate,
Paul Dilley