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Running rich

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I had my TR2 set up on a rolling road last year and now without touching the carbs SU I am running very rich. About 20mpg. What may of happened or do I need to adjust the mixture, if so is the adjusting nut up or down to weaken the mixture.

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Check the choke control is going fully home on the carbs. Also, sometimes the outer cable can jump out of its socket.

If a float chamber valve has stuck open fuel might be flowing out of the overflow to ground, that can lower mpg a lot.

If its one carb at fault the two plugs it feeds should be black with carbon.

If you only suspect its rich because of the poor mpg, it might be spark timing gone off rather than a carb fault.

A local TRR member should be able to find the problem for you.


Edited by Peter Cobbold

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