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Potential worn throttle shafts. Adding choke to enriched mixture makes up f=
or unmetered air that is coming from someplace. =20
Check the play in throttle shafts and then look for other areas that might d=
o same.=20
Also how's the float bowl fuel level? Adding choke also drops nozzle to lev=
el of lower fuel bowl. But if it runs well otherwise and always idles decent=
then neither may apply.=20
All just wags without being there.=20
Dave Sommers
Dive Hatteras
703-517-3724
703-818-1850
> On May 2, 2015, at 16:55, wattaj via Datsun-roadsters <datsun-roadsters@au=
tox.team.net> wrote:
>=20
> Update: Reassembled and plugged the lifter piston hole, and no improvemen=
t.
>=20
> Things I have done:
> Verified the timing and vacuum advance are set and working correctly.
> Adjusted the valves to correct clearance.
> Changed the dashpot oil to ATF.
> Disassembled the Domes, Pistons, Needles and cleaned.
> Reset the needles to correct depth according the Z-Therapy video method.
> Checked to make sure SU pistons are moving at the same pace within the dom=
es.
> Checked for a kinked fuel lines from the float chambers to the nozzles.
> Set/Tuned the carbs according the write-up by Keith Williams.
>=20
> The only thing that seems to get the car running smoothly and able to acce=
lerate once at speed is to pull the choke out or set the mixture to very ric=
h.
>=20
> I would maybe suspect the distributor is worn out, but if that were the ca=
se I wouldn't think pulling the choke out would make any difference.
>=20
> Thanks,
> Alan
>=20
>=20
>=20
> From: wattaj via Datsun-roadsters <datsun-roadsters@autox.team.net>
> To: "datsun-roadsters@autox.team.net" <datsun-roadsters@autox.team.net>=20=
> Sent: Saturday, May 2, 2015 10:49 AM
> Subject: [Roadsters] High Speed Hesitation / Potential Fix?
>=20
> I have been chasing this issue for a while and I am hoping I may have foun=
d something but would like your feedback. (Thanks in advance!)
>=20
> When cruising around 3000 to 3200 RPM, if I press on the accelerator, the m=
otor wants to hesitate or cough, it will eventually get beyond this, but is a=
nnoying. I have done my best to tune things and the only thing that helps i=
s making the front carb run very rich.
>=20
> Today, when dissembling the carbs, I noticed the front carb was missing th=
e Lifter Piston (part # 16324-10400) that you can use to test the lean/rich m=
ixture from the bottom of the carb without having to put your finger into th=
e throat of the carb. =20
>=20
> Could that be creating a vacuum leak and cause of my issue?
>=20
> Thanks,
> Alan
>=20
> 67-1600 (with a 67.5 engine)
> Portland, OR
>=20
>=20
>=20
>=20
> ________________________________________
>=20
> datsun-roadsters@autox.team.net
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe: http://autox.team.net/mailman/options/datsun-roadsters/wattaj=
@yahoo.com
>=20
>=20
>=20
>=20
> ________________________________________
>=20
> datsun-roadsters@autox.team.net
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe: http://autox.team.net/mailman/options/datsun-roadsters/diveha=
tteras@aol.com
>=20
>=20
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div>Potential worn throttle shafts. =
Adding choke to enriched mixture makes up for unmetered air that is coming f=
rom someplace. </div><div><br></div><div>Check the play in throttle sh=
afts 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 drop=
s nozzle to level of lower fuel bowl. But if it runs well otherwise and alwa=
ys idles decent then neither may apply. </div><div><br></div><div>All j=
ust wags without being there. <br><br>Dave Sommers<div>Dive Hatteras</d=
iv><div>703-517-3724</div><div>703-818-1850</div></div><div><br>On May 2, 20=
15, at 16:55, wattaj via Datsun-roadsters <<a href=3D"mailto:datsun-roads=
ters@autox.team.net">datsun-roadsters@autox.team.net</a>> wrote:<br><br><=
/div><blockquote type=3D"cite"><div><div style=3D"color:#000; background-col=
or:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida=
Grande, sans-serif;font-size:16px"><div id=3D"yui_3_16_0_1_1430599258577_34=
92">Update: Reassembled and plugged the lifter piston hole, and no imp=
rovement.</div><div id=3D"yui_3_16_0_1_1430599258577_3492"><br></div><div id=
=3D"yui_3_16_0_1_1430599258577_3492">Things I have done:</div><ol dir=3D"ltr=
" id=3D"yui_3_16_0_1_1430599258577_4440"><li id=3D"yui_3_16_0_1_143059925857=
7_4446">Verified the timing and vacuum advance are set and working correctly=
.<br></li><li id=3D"yui_3_16_0_1_1430599258577_4445">Adjusted the valves to c=
orrect clearance.<br></li><li id=3D"yui_3_16_0_1_1430599258577_4444">Changed=
the dashpot oil to ATF.<br></li><li id=3D"yui_3_16_0_1_1430599258577_4443">=
Disassembled the Domes, Pistons, Needles and cleaned.<br></li><li id=3D"yui_=
3_16_0_1_1430599258577_4442">Reset the needles to correct depth according th=
e Z-Therapy video method.<br></li><li id=3D"yui_3_16_0_1_1430599258577_4441"=
>Checked to make sure SU pistons are moving at the same pace within the dome=
s.<br></li><li id=3D"yui_3_16_0_1_1430599258577_4439">Checked for a kinked f=
uel lines from the float chambers to the nozzles.<br></li><li id=3D"yui_3_16=
_0_1_1430599258577_4439">Set/Tuned the carbs according the write-up by Keith=
Williams.</li></ol><div id=3D"yui_3_16_0_1_1430599258577_3492" dir=3D"ltr">=
<br></div><div id=3D"yui_3_16_0_1_1430599258577_3492" dir=3D"ltr">The only t=
hing that seems to get the car running smoothly and able to accelerate once a=
t speed is to pull the choke out or set the mixture to very rich.</div><div i=
d=3D"yui_3_16_0_1_1430599258577_3492" dir=3D"ltr"><br></div><div id=3D"yui_3=
_16_0_1_1430599258577_3492" dir=3D"ltr">I would maybe suspect the distributo=
r is worn out, but if that were the case I wouldn't think pulling the choke o=
ut would make any difference.</div><div id=3D"yui_3_16_0_1_1430599258577_349=
2" dir=3D"ltr"><br></div><div id=3D"yui_3_16_0_1_1430599258577_3492" dir=3D"=
ltr">Thanks,</div><div id=3D"yui_3_16_0_1_1430599258577_3492" dir=3D"ltr">Al=
an</div><div id=3D"yui_3_16_0_1_1430599258577_3492" dir=3D"ltr"><br></div><d=
iv id=3D"yui_3_16_0_1_1430599258577_3492" dir=3D"ltr"><br></div><div id=3D"y=
ui_3_16_0_1_1430599258577_3492"><br></div> <div style=3D"font-family: Helve=
ticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-=
size: 16px;" id=3D"yui_3_16_0_1_1430599258577_3821"> <div style=3D"font-fami=
ly: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-ser=
if; font-size: 16px;" id=3D"yui_3_16_0_1_1430599258577_3820"> <div dir=3D"lt=
r" id=3D"yui_3_16_0_1_1430599258577_3819"> <hr size=3D"1" id=3D"yui_3_16_0_1=
_1430599258577_3867"> <font size=3D"2" face=3D"Arial" id=3D"yui_3_16_0_1_14=
30599258577_3866"> <b><span style=3D"font-weight:bold;">From:</span></b> wat=
taj via Datsun-roadsters <<a href=3D"mailto:datsun-roadsters@autox.team.n=
et">datsun-roadsters@autox.team.net</a>><br> <b><span style=3D"font-weigh=
t: bold;">To:</span></b> "<a href=3D"mailto:datsun-roadsters@autox.team.net"=
>datsun-roadsters@autox.team.net</a>" <<a href=3D"mailto:datsun-roadsters=
@autox.team.net">datsun-roadsters@autox.team.net</a>> <br> <b><span style=
=3D"font-weight: bold;">Sent:</span></b> Saturday, May 2, 2015 10:49 AM<br> <=
b><span style=3D"font-weight: bold;">Subject:</span></b> [Roadsters] High Sp=
eed Hesitation / Potential Fix?<br> </font> </div> <div class=3D"y_msg_conta=
iner" id=3D"yui_3_16_0_1_1430599258577_3824"><br><div id=3D"yiv2199568988"><=
div id=3D"yui_3_16_0_1_1430599258577_3828"><div style=3D"color:#000;backgrou=
nd-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, L=
ucida Grande, sans-serif;font-size:16px;" id=3D"yui_3_16_0_1_1430599258577_3=
827"><div dir=3D"ltr" id=3D"yiv2199568988yui_3_16_0_1_1430588092886_4465"><s=
pan id=3D"yiv2199568988yui_3_16_0_1_1430588092886_4642">I have been chasing t=
his issue for a while and I am hoping I may have found something but would l=
ike your feedback. (Thanks in advance!)</span></div><div dir=3D"ltr" i=
d=3D"yiv2199568988yui_3_16_0_1_1430588092886_4465"><span><br clear=3D"none">=
</span></div><div dir=3D"ltr" id=3D"yiv2199568988yui_3_16_0_1_1430588092886_=
4465"><span id=3D"yiv2199568988yui_3_16_0_1_1430588092886_4643">When cruisin=
g 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. &nb=
sp;I have done my best to tune things and the only thing that helps is makin=
g the front carb run very rich.</span></div><div dir=3D"ltr" id=3D"yiv219956=
8988yui_3_16_0_1_1430588092886_4465"><span><br clear=3D"none"></span></div><=
div dir=3D"ltr" id=3D"yiv2199568988yui_3_16_0_1_1430588092886_4465"><span cl=
ass=3D"yiv2199568988" id=3D"yiv2199568988yui_3_16_0_1_1430588092886_4699" st=
yle=3D"">Today, when dissembling the carbs, I noticed the front carb was mis=
sing the Lifter Piston (part #<font id=3D"yiv2199568988yui_3_16_0_1_14305880=
92886_4955" size=3D"3"> </font></span><font id=3D"yiv2199568988yui_3_16=
_0_1_1430588092886_4954" size=3D"3"><span class=3D"yiv2199568988" id=3D"yiv2=
199568988yui_3_16_0_1_1430588092886_4857" style=3D"font-family:Arial, Helvet=
ica;">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 t=
he throat of the carb. </div><div dir=3D"ltr" id=3D"yiv2199568988yui_3=
_16_0_1_1430588092886_4465"><span><br clear=3D"none"></span></div><div dir=3D=
"ltr" id=3D"yiv2199568988yui_3_16_0_1_1430588092886_4465"><span id=3D"yiv219=
9568988yui_3_16_0_1_1430588092886_4806">Could that be creating a vacuum leak=
and cause of my issue?</span></div><div dir=3D"ltr" id=3D"yiv2199568988yui_=
3_16_0_1_1430588092886_4465"><span><br clear=3D"none"></span></div><div dir=3D=
"ltr" id=3D"yiv2199568988yui_3_16_0_1_1430588092886_4465"><span id=3D"yui_3_=
16_0_1_1430599258577_4359">Thanks,</span></div><div dir=3D"ltr" id=3D"yiv219=
9568988yui_3_16_0_1_1430588092886_4465"><span id=3D"yiv2199568988yui_3_16_0_=
1_1430588092886_5026">Alan</span></div><div dir=3D"ltr" id=3D"yiv2199568988y=
ui_3_16_0_1_1430588092886_4465"><span><br clear=3D"none"></span></div><div d=
ir=3D"ltr" id=3D"yiv2199568988yui_3_16_0_1_1430588092886_4465"><span id=3D"y=
iv2199568988yui_3_16_0_1_1430588092886_5014">67-1600 (with a 67.5 engine)</s=
pan></div><div dir=3D"ltr" id=3D"yiv2199568988yui_3_16_0_1_1430588092886_446=
5"><span id=3D"yiv2199568988yui_3_16_0_1_1430588092886_5045">Portland, OR</s=
pan></div><div class=3D"qtdSeparateBR"><br><br></div><div class=3D"yiv219956=
8988yqt3367531350" id=3D"yiv2199568988yqtfd47683"><div id=3D"yiv2199568988yu=
i_3_16_0_1_1430588092886_4568" style=3D"font-family:HelveticaNeue, Helvetica=
Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"><div id=3D=
"yiv2199568988yui_3_16_0_1_1430588092886_4567" style=3D"font-family:Helvetic=
aNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size=
:16px;"><div class=3D"yiv2199568988y_msg_container" id=3D"yiv2199568988yui_3=
_16_0_1_1430588092886_4574"><br clear=3D"none"></div> </div> </div> </div><=
/div></div></div><br><div class=3D"yqt3367531350" id=3D"yqtfd78272">________=
________________________________<br clear=3D"none"><br clear=3D"none"><a sha=
pe=3D"rect" ymailto=3D"mailto:datsun-roadsters@autox.team.net"; href=3D"mailt=
o:datsun-roadsters@autox.team.net">datsun-roadsters@autox.team.net</a><br cl=
ear=3D"none"><br clear=3D"none">Donate: <a shape=3D"rect" href=3D"http://www=
.team.net/donate.html" target=3D"_blank">http://www.team.net/donate.html</a>=
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chive" target=3D"_blank">http://www.team.net/archive</a><br clear=3D"none">Fo=
rums: <a shape=3D"rect" href=3D"http://www.team.net/forums"; target=3D"_blank=
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rect" href=3D"http://autox.team.net/mailman/options/datsun-roadsters/wattaj@=
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adsters/wattaj@yahoo.com</a><br clear=3D"none"><br clear=3D"none"><br clear=3D=
"none"></div><br><br></div> </div> </div> </div></div></blockquote><blockqu=
ote type=3D"cite"><div><span>________________________________________</span>=
<br><span></span><br><span><a href=3D"mailto:datsun-roadsters@autox.team.net=
">datsun-roadsters@autox.team.net</a></span><br><span></span><br><span>Donat=
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as@aol.com</a></span><br><span></span><br><span></span><br></div></blockquot=
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