Tony, I have had this problem since my rebuild which included new carbs.
I always thought that it was only my car and I had a problem but I learned
from this list that my situation is typical of 69-70 SUs without smog pump.
I did not mention, the problem seems to be at idle. Anything above that, I
am told there is no evidence of smoke. A couple of listers said they were
experimenting with different needles and I was wondering if any solution
had been found.
Yes I have tried to lean out the carbs but too much and I get backfiring
during deceleration and I know, at that leanness, I could burn my pistons.
I have set the floats with no positive change.
John Schmitt Telecommuter External # - 847-458-7829
pager 800-759-8888 pin# 8710561
"Tony Genovese" <chaztg@hotmail.com> on 02/12/2001 10:03:38 AM
Please respond to chaztg@hotmail.com
To: John Schmitt/Schaumburg/Contr/AT&T/IJV@IBMUS
cc: datsun-roadsters@autox.team.net
Subject: Re: SU needles
Dear John and everybody,
I have never owned a 2000w/ SUs, but I have owned a 1600 w/ SUs and I still
tinker with my 240Z and it has them.
Taking off the emissions equipment shouldn't affect the running/starting of
the car quite like that. I would say possibly it's an internal engine
problem--rings, valves,etc...
However, the black smoke does indicate an over-rich mixture. Have you tried
leaning the carbs out at all, or checking your air filter to see if it
needs
replacing? It also could be the level of fuel in your float chambers, but I
think that's a stretch.
Tony
San Diego
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