You can pull the spark plugs and check the color. Nice grey color indicates a
good mixture, black color indicates that the mixture is too rich. It can vary
from one carb to the other.....
Tom
-Subject: [TR] The big bang
Hi all,
Finally enjoying my newly restored 62 TR4. I do have one question -
usually after driving it for more than 15 minutes, when I shut it off, the
motor stops & it doesn't run on / diesel, but after maybe two or three
seconds - Bang! Not a very loud backfire, (almost like a backfire under
water).
I just installed a Pertronix kit (what a difference!) but still a backfire.
I have SU carbs that may be running a bit rich, but I am not sure how to
quantify. I have been playing with the idle as it has been fairly high
(1200 rpms at idle) I do have 87mm pistons & a 270 cam with a slightly
milled head for higher compression.
Any advice or would help.
Thanks as always,
John D
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