It sounds like it is running a little rich especially if the plugs are wet and
compression is ok. I am not familiar with the solex carbs yet so someone else
will have to tell you if you need smaller jets or different carb adjustment.
If a plug replacement cures it temporarily then plugs are fouled by the fuel or
you are burning too much oil and fouling that way. If it is fuel, smaller jets
should make it better for lower RPM but it may suffer some at higher RPM.
If you have good compression, there could be a valve seal problem and sucking
oil
there. Is there any smoke out the exaust? You may not be able to tell this
yourself. Have someone follow you and then do a short full throttle run. Smoke
should be a little black. If you coast in gear, like down a hill, then hit the
throttle, do you get smoke there? If blue smoke, then you have some oil burning
Are the other plugs tan on the porcelain?
CBAKER6231@aol.com wrote:
> Have 69 2000 with solex carbs. Have a year and a few thousand miles on a
> complete rebuild, new electronic ignition, etc.
>
> Recently #3 cylinder began missing at idle and under normal load. It fires
> fine when I accelerate. The plug is wet.
>
> Compression, valves clearances, timing, plugs and wires all check out fine.
> The idle mixture screw has not been changed -- when it is changed it doesn't
> make any difference. Jets are all securely tightened -- have been blown out
> with carb cleaner.
>
> Obviously if I keep my foot into it at all times this is not a problem, but a
> more responsible solution is probably in order.
>
> Anything else that I should check before tearing the carb apart? And, if I
> tear the carb apart is there anything specific I should be looking for?
>
> Thanks in advance for the help.
>
> Calvin Baker
> 69 2L
> Tucson
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