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<DIV>Try heavier oil in the dashpot. If it cruises fine then the mixture is
good. Stumbling on acceleration is a sign of not being enriched enough on
acceleration. Thicker oil will enrichen more on acceleration. Try some 30 wt
engine oil and see if it gets better.</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 5/2/2015 2:46:55 P.M. Pacific Daylight Time,
datsun-roadsters@autox.team.net writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>
<DIV>Potential worn throttle shafts. Adding choke to enriched mixture
makes up for unmetered air that is coming from someplace. </DIV>
<DIV><BR></DIV>
<DIV>Check the play in throttle shafts and then look for other areas that
might do same. </DIV>
<DIV><BR></DIV>
<DIV>Also how's the float bowl fuel level? Adding choke also drops
nozzle to level of lower fuel bowl. But if it runs well otherwise and always
idles decent then neither may apply. </DIV>
<DIV><BR></DIV>
<DIV>All just wags without being there. <BR><BR>Dave Sommers
<DIV>Dive Hatteras</DIV>
<DIV>703-517-3724</DIV>
<DIV>703-818-1850</DIV></DIV>
<DIV><BR>On May 2, 2015, at 16:55, wattaj via Datsun-roadsters <<A
title=mailto:datsun-roadsters@autox.team.net
href="mailto:datsun-roadsters@autox.team.net">datsun-roadsters@autox.team.net</A>>
wrote:<BR><BR></DIV>
<BLOCKQUOTE type="cite">
<DIV>
<DIV
style="FONT-SIZE: 16px; FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; COLOR: #000; BACKGROUND-COLOR: #fff">
<DIV id=yui_3_16_0_1_1430599258577_3492>Update: Reassembled and
plugged the lifter piston hole, and no improvement.</DIV>
<DIV id=yui_3_16_0_1_1430599258577_3492><BR></DIV>
<DIV id=yui_3_16_0_1_1430599258577_3492>Things I have done:</DIV>
<OL id=yui_3_16_0_1_1430599258577_4440 dir=ltr>
<LI id=yui_3_16_0_1_1430599258577_4446>Verified the timing and vacuum
advance are set and working correctly.<BR>
<LI id=yui_3_16_0_1_1430599258577_4445>Adjusted the valves to correct
clearance.<BR>
<LI id=yui_3_16_0_1_1430599258577_4444>Changed the dashpot oil to ATF.<BR>
<LI id=yui_3_16_0_1_1430599258577_4443>Disassembled the Domes, Pistons,
Needles and cleaned.<BR>
<LI id=yui_3_16_0_1_1430599258577_4442>Reset the needles to correct depth
according the Z-Therapy video method.<BR>
<LI id=yui_3_16_0_1_1430599258577_4441>Checked to make sure SU pistons are
moving at the same pace within the domes.<BR>
<LI id=yui_3_16_0_1_1430599258577_4439>Checked for a kinked fuel lines
from the float chambers to the nozzles.<BR>
<LI id=yui_3_16_0_1_1430599258577_4439>Set/Tuned the carbs according the
write-up by Keith Williams.</LI></OL>
<DIV id=yui_3_16_0_1_1430599258577_3492 dir=ltr><BR></DIV>
<DIV id=yui_3_16_0_1_1430599258577_3492 dir=ltr>The only thing that seems to
get the car running smoothly and able to accelerate once at speed is to pull
the choke out or set the mixture to very rich.</DIV>
<DIV id=yui_3_16_0_1_1430599258577_3492 dir=ltr><BR></DIV>
<DIV id=yui_3_16_0_1_1430599258577_3492 dir=ltr>I would maybe suspect the
distributor is worn out, but if that were the case I wouldn't think pulling
the choke out would make any difference.</DIV>
<DIV id=yui_3_16_0_1_1430599258577_3492 dir=ltr><BR></DIV>
<DIV id=yui_3_16_0_1_1430599258577_3492 dir=ltr>Thanks,</DIV>
<DIV id=yui_3_16_0_1_1430599258577_3492 dir=ltr>Alan</DIV>
<DIV id=yui_3_16_0_1_1430599258577_3492 dir=ltr><BR></DIV>
<DIV id=yui_3_16_0_1_1430599258577_3492 dir=ltr><BR></DIV>
<DIV id=yui_3_16_0_1_1430599258577_3492><BR></DIV>
<DIV id=yui_3_16_0_1_1430599258577_3821
style="FONT-SIZE: 16px; FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif">
<DIV id=yui_3_16_0_1_1430599258577_3820
style="FONT-SIZE: 16px; FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif">
<DIV id=yui_3_16_0_1_1430599258577_3819 dir=ltr>
<HR id=yui_3_16_0_1_1430599258577_3867 SIZE=1>
<FONT id=yui_3_16_0_1_1430599258577_3866 size=2 face=Arial><B><SPAN
style="FONT-WEIGHT: bold">From:</SPAN></B> wattaj via Datsun-roadsters
<<A title=mailto:datsun-roadsters@autox.team.net
href="mailto:datsun-roadsters@autox.team.net">datsun-roadsters@autox.team.net</A>><BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN></B> "<A
title=mailto:datsun-roadsters@autox.team.net
href="mailto:datsun-roadsters@autox.team.net">datsun-roadsters@autox.team.net</A>"
<<A title=mailto:datsun-roadsters@autox.team.net
href="mailto:datsun-roadsters@autox.team.net">datsun-roadsters@autox.team.net</A>>
<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Saturday, May 2,
2015 10:49 AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B>
[Roadsters] High Speed Hesitation / Potential Fix?<BR></FONT></DIV>
<DIV id=yui_3_16_0_1_1430599258577_3824 class=y_msg_container><BR>
<DIV id=yiv2199568988>
<DIV id=yui_3_16_0_1_1430599258577_3828>
<DIV id=yui_3_16_0_1_1430599258577_3827
style="FONT-SIZE: 16px; FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; COLOR: #000; BACKGROUND-COLOR: #fff">
<DIV id=yiv2199568988yui_3_16_0_1_1430588092886_4465 dir=ltr><SPAN
id=yiv2199568988yui_3_16_0_1_1430588092886_4642>I have been chasing this
issue for a while and I am hoping I may have found something but would like
your feedback. (Thanks in advance!)</SPAN></DIV>
<DIV id=yiv2199568988yui_3_16_0_1_1430588092886_4465 dir=ltr><SPAN><BR
clear=none></SPAN></DIV>
<DIV id=yiv2199568988yui_3_16_0_1_1430588092886_4465 dir=ltr><SPAN
id=yiv2199568988yui_3_16_0_1_1430588092886_4643>When cruising around 3000 to
3200 RPM, if I press on the accelerator, the motor wants to hesitate or
cough, it will eventually get beyond this, but is annoying. I have
done my best to tune things and the only thing that helps is making the
front carb run very rich.</SPAN></DIV>
<DIV id=yiv2199568988yui_3_16_0_1_1430588092886_4465 dir=ltr><SPAN><BR
clear=none></SPAN></DIV>
<DIV id=yiv2199568988yui_3_16_0_1_1430588092886_4465 dir=ltr><SPAN
id=yiv2199568988yui_3_16_0_1_1430588092886_4699 class=yiv2199568988>Today,
when dissembling the carbs, I noticed the front carb was missing the Lifter
Piston (part #<FONT id=yiv2199568988yui_3_16_0_1_1430588092886_4955
size=3> </FONT></SPAN><FONT
id=yiv2199568988yui_3_16_0_1_1430588092886_4954 size=3><SPAN
id=yiv2199568988yui_3_16_0_1_1430588092886_4857 class=yiv2199568988
style="FONT-FAMILY: Arial, Helvetica">16324-10400)</SPAN> </FONT>that
you can use to test the lean/rich mixture from the bottom of the carb
without having to put your finger into the throat of the carb. </DIV>
<DIV id=yiv2199568988yui_3_16_0_1_1430588092886_4465 dir=ltr><SPAN><BR
clear=none></SPAN></DIV>
<DIV id=yiv2199568988yui_3_16_0_1_1430588092886_4465 dir=ltr><SPAN
id=yiv2199568988yui_3_16_0_1_1430588092886_4806>Could that be creating a
vacuum leak and cause of my issue?</SPAN></DIV>
<DIV id=yiv2199568988yui_3_16_0_1_1430588092886_4465 dir=ltr><SPAN><BR
clear=none></SPAN></DIV>
<DIV id=yiv2199568988yui_3_16_0_1_1430588092886_4465 dir=ltr><SPAN
id=yui_3_16_0_1_1430599258577_4359>Thanks,</SPAN></DIV>
<DIV id=yiv2199568988yui_3_16_0_1_1430588092886_4465 dir=ltr><SPAN
id=yiv2199568988yui_3_16_0_1_1430588092886_5026>Alan</SPAN></DIV>
<DIV id=yiv2199568988yui_3_16_0_1_1430588092886_4465 dir=ltr><SPAN><BR
clear=none></SPAN></DIV>
<DIV id=yiv2199568988yui_3_16_0_1_1430588092886_4465 dir=ltr><SPAN
id=yiv2199568988yui_3_16_0_1_1430588092886_5014>67-1600 (with a 67.5
engine)</SPAN></DIV>
<DIV id=yiv2199568988yui_3_16_0_1_1430588092886_4465 dir=ltr><SPAN
id=yiv2199568988yui_3_16_0_1_1430588092886_5045>Portland, OR</SPAN></DIV>
<DIV class=qtdSeparateBR><BR><BR></DIV>
<DIV id=yiv2199568988yqtfd47683 class=yiv2199568988yqt3367531350>
<DIV id=yiv2199568988yui_3_16_0_1_1430588092886_4568
style="FONT-SIZE: 16px; FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif">
<DIV id=yiv2199568988yui_3_16_0_1_1430588092886_4567
style="FONT-SIZE: 16px; FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif">
<DIV id=yiv2199568988yui_3_16_0_1_1430588092886_4574
class=yiv2199568988y_msg_container><BR
clear=none></DIV></DIV></DIV></DIV></DIV></DIV></DIV><BR>
<DIV id=yqtfd78272
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