Checking Spark Plugs for Mixture

No1 front on the left

I had a good run in the MG during the week so thought a good time to check the plugs for colour which will give an indication of the fuel balance between the twin carbs.

There is quite a noticeable difference between the 2 front plugs and the 2 rear plugs. The rear 2 look very close to the best based on the plug colour chart whilst the 2 front plugs definitely look a bit lean.

Spark Plug Colour Chart

So a quarter turn on the front carb to richen the mixture slightly …… remember that with SU HIF carbs you screw in the mixture screw to enrichen it – not what you would expect.

See more about the spark plug colour guide at ……

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