David,
Some questions, and some possibilities.
Did the car start when warm before your rebuilt the carbs?
When you say that the Roadster starts fine when cold, is that with the
choke knob pulled or in?
Did you synchronize the carbs after putting them back on?
If you watch the carb pistons when the engine is running, both at idle
and when advancing the throttle, do both pistons rise the same amount?
If you lift the pistons with the engine off do the both make a click
when they bottom out, or do they stop before they get all the way to the
bottom? If they don't, the jet on that carb needs to be centered.
Are the shoulders on the needles sitting flush with the bottom of the
pistons?
Have you verified that the carb float levels are correct? The fuel
should be just below the top of the jets
There is a piston lift pin on each carb. With the engine running when
you press up on the pin on one carb, the engine should slow down, but
continue to run. Try the same on the other carb and it should slow down
about the same. If they don't match, the carb synchronization is off.
If lifting the carb pistons helps it to start better, then you are
enrichening the mixture, not leaning it out. There is only one mixture
adjustment on each carb, the knurled knob around the jet on the bottom
of the carb. The way to adjust the mixture at high speed vs. idle is to
change the needles. Turning the knob CCW from the bottom of the carb
enrichens the mixture.
Check the mixture to be sure that it is set correctly, I use a wide
range O2 sensor on a piece of exhaust pipe that I insert in my tailpipe
connected to a digital voltmeter.
Peace,
Pat
Thusly spake David Boerst, On 5/27/2010 2:47 PM:
> My gals' 1966 Roadster is a bear to start when hot. If I lift the choke
>pistons it starts easily. I overhauled the carbs and did a excellent job,
>meaning soaked them in carb cleaner, washed them in hot soapy water then clean
>water and blew them and passages completely dry. Use all new needles, jets
>etc. The car runs great when its running. Starts first try coold. Timing is
>correct. How do I lean it out or what else could be done. Thank you everyone
>who has commented before!
> ________________________________________
> Datsun-roadsters@autox.team.net
> Donate: http://www.team.net/donate.html
> Suggested annual donation $16.00
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe/Manage:
>http://autox.team.net/mailman/options/datsun-roadsters/pat@hornesystemstx.com
>
>
>
--
Pat Horne, Owner, Horne Systems
(512) 797-7501 Voice 5026 FM 2001
Pat@HorneSystemsTx.com Lockhart, TX 78644-4443
www.hornesystemstx.com
-- We support Habitat for Humanity - a hand UP, not a hand OUT --
________________________________________
Datsun-roadsters@autox.team.net
Donate: http://www.team.net/donate.html
Suggested annual donation $16.00
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums
|