This question is not of interest to racers, but my street TR250 has had
a problem with run-on or dieseling since leaded premium went away back
in the 1980s. This has continued through several carb rebuilds, many
ignition configuration changes and recently an engine rebuild. During
recent rebuild, I tried to remove any sharp areas that might create hot
spots and of course all the carbon has been removed, but the problem
still persists. There is additional tuning I should and will do such as
carb rebuilds, carb needles, timing advance curves, etc., but I suspect
this problem will continue. The solution for later Triumphs and other
British cars was the anti run-on valve. It appears that the simplest
retrofit would be to install a Rover/MG ADU9535 valve. Basically, the
valve opens when the ignition is turned off and floods the manifold with
air making the mixture too weak to support combustion. Where do I find
one of these valves? They do not appear to be available except on ebay.uk.
Larry
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