Hi,
First, thanks for all the replies - you guys are great!
I decided to start from scratch. I've replaced points and plugs. Gap set
correctly for both, dwell is within spec, timing is correct. So I'm
confident the ignition system is OK.
I then took the piston chamber & piston off both carbs . Needles look
fine. They're spring-loaded ones & I can't see any ridges or flat spots on
them. The tubing attached to the jets looks much cleaner than the rest of
the carbs - maybe recently replaced by previous owner?
Both jets were very high. I adjusted them down to flush with the bridge,
then another two complete turns. I turned the engine on the start for a
few seconds with the coil lead out. I can see petrol a little down in each
jet - not overflowing and there's no sign of petrol leaking from the carbs
or float bowls.
I put everything back together & started it. It's VERY rich. Black smoke
out the exhaust, won't idle at all. I adjusted them both up two complete
turns and it idles but it's rough. Drives rough as well. I tried some more
adjustments on the carbs individually - adjusting the rear one as far up
as it will go seems to help, but even there it's too rich. If I lift the
piston with the pin, the engine speeds up.
Adjusting the front carb doesn't seem to do anything - it doesn't get
better or worse. Lifting the piston doesn't change the engine but it
almost stalls when I drop it back.
I took plugs 1 & 4 out & they're both really sooty.
I'm suspecting that jets, needles or both are very wrong. Any comments?
How do I tell what I've got? I guess I can just order the correct new ones
& see if that helps but I won't be very happy if it's something else.
Regards,
David Robertson
1961 Thunderbird
1978 Triumph 2500S
1974 Triumph Spitfire
<<< Life is too short to drive boring cars >>>
http://www.robertson.org.nz/David1.htm
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