<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><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 dir="ltr" id="yui_3_16_0_1_1430599258577_4440"><li id="yui_3_16_0_1_1430599258577_4446">Verified the timing and vacuum advance are set and working correctly.<br></li><li id="yui_3_16_0_1_1430599258577_4445">Adjusted the valves to correct clearance.<br></li><li id="yui_3_16_0_1_1430599258577_4444">Changed the dashpot oil to ATF.<br></li><li id="yui_3_16_0_1_1430599258577_4443">Disassembled the Domes, Pistons, Needles and cleaned.<br></li><li id="yui_3_16_0_1_1430599258577_4442">Reset the needles to correct depth according the Z-Therapy video method.<br></li><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><li id="yui_3_16_0_1_1430599258577_4439">Checked for a kinked fuel lines from the float chambers to the nozzles.<br></li><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 style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1430599258577_3821"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1430599258577_3820"> <div dir="ltr" id="yui_3_16_0_1_1430599258577_3819"> <hr size="1" id="yui_3_16_0_1_1430599258577_3867"> <font size="2" face="Arial" id="yui_3_16_0_1_1430599258577_3866"> <b><span style="font-weight:bold;">From:</span></b> wattaj via Datsun-roadsters <datsun-roadsters@autox.team.net><br> <b><span style="font-weight: bold;">To:</span></b> "datsun-roadsters@autox.team.net" <datsun-roadsters@autox.team.net> <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 class="y_msg_container" id="yui_3_16_0_1_1430599258577_3824"><br><div id="yiv2199568988"><div id="yui_3_16_0_1_1430599258577_3828"><div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;" id="yui_3_16_0_1_1430599258577_3827"><div dir="ltr" id="yiv2199568988yui_3_16_0_1_1430588092886_4465"><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 dir="ltr" id="yiv2199568988yui_3_16_0_1_1430588092886_4465"><span><br clear="none"></span></div><div dir="ltr" id="yiv2199568988yui_3_16_0_1_1430588092886_4465"><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 dir="ltr" id="yiv2199568988yui_3_16_0_1_1430588092886_4465"><span><br clear="none"></span></div><div dir="ltr" id="yiv2199568988yui_3_16_0_1_1430588092886_4465"><span class="yiv2199568988" id="yiv2199568988yui_3_16_0_1_1430588092886_4699" style="">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 class="yiv2199568988" id="yiv2199568988yui_3_16_0_1_1430588092886_4857" 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 dir="ltr" id="yiv2199568988yui_3_16_0_1_1430588092886_4465"><span><br clear="none"></span></div><div dir="ltr" id="yiv2199568988yui_3_16_0_1_1430588092886_4465"><span id="yiv2199568988yui_3_16_0_1_1430588092886_4806">Could that be creating a vacuum leak and cause of my issue?</span></div><div dir="ltr" id="yiv2199568988yui_3_16_0_1_1430588092886_4465"><span><br clear="none"></span></div><div dir="ltr" id="yiv2199568988yui_3_16_0_1_1430588092886_4465"><span id="yui_3_16_0_1_1430599258577_4359">Thanks,</span></div><div dir="ltr" id="yiv2199568988yui_3_16_0_1_1430588092886_4465"><span id="yiv2199568988yui_3_16_0_1_1430588092886_5026">Alan</span></div><div dir="ltr" id="yiv2199568988yui_3_16_0_1_1430588092886_4465"><span><br clear="none"></span></div><div dir="ltr" id="yiv2199568988yui_3_16_0_1_1430588092886_4465"><span id="yiv2199568988yui_3_16_0_1_1430588092886_5014">67-1600 (with a 67.5 engine)</span></div><div dir="ltr" id="yiv2199568988yui_3_16_0_1_1430588092886_4465"><span id="yiv2199568988yui_3_16_0_1_1430588092886_5045">Portland, OR</span></div><div class="qtdSeparateBR"><br><br></div><div class="yiv2199568988yqt3367531350" id="yiv2199568988yqtfd47683"><div id="yiv2199568988yui_3_16_0_1_1430588092886_4568" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"><div id="yiv2199568988yui_3_16_0_1_1430588092886_4567" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"><div class="yiv2199568988y_msg_container" id="yiv2199568988yui_3_16_0_1_1430588092886_4574"><br clear="none"></div> </div> </div> </div></div></div></div><br><div class="yqt3367531350" id="yqtfd78272">________________________________________<br clear="none"><br clear="none"><a shape="rect" ymailto="mailto:datsun-roadsters@autox.team.net" href="mailto:datsun-roadsters@autox.team.net">datsun-roadsters@autox.team.net</a><br clear="none"><br clear="none">Donate: <a shape="rect" href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a><br clear="none">Archive: <a shape="rect" href="http://www.team.net/archive" target="_blank">http://www.team.net/archive</a><br clear="none">Forums: <a shape="rect" href="http://www.team.net/forums" target="_blank">http://www.team.net/forums</a><br clear="none">Unsubscribe: <a shape="rect" href="http://autox.team.net/mailman/options/datsun-roadsters/wattaj@yahoo.com" target="_blank">http://autox.team.net/mailman/options/datsun-roadsters/wattaj@yahoo.com</a><br clear="none"><br clear="none"><br clear="none"></div><br><br></div> </div> </div> </div></body></html>