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A tachometer - preferably an instrument with a fine scale (0-3000rpm, say) - can be useful for tuning the carburettor. When it is connected to the coil, the slightest twist of the mixture-adjustment screw alters the engine speed. To adjust the mixture, set the screw to give the highest possible rpm consistent with the smooth running of the engine.

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Stroboscopic timing

The strobe light is usually connected between the sparkplug and the plug cap. Inductive connecti...