<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_1430588092886_4465" dir="ltr"><span id="yui_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="yui_3_16_0_1_1430588092886_4465" dir="ltr"><span><br></span></div><div id="yui_3_16_0_1_1430588092886_4465" dir="ltr"><span id="yui_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="yui_3_16_0_1_1430588092886_4465" dir="ltr"><span><br></span></div><div id="yui_3_16_0_1_1430588092886_4465" dir="ltr"><span id="yui_3_16_0_1_1430588092886_4699" class="" style="">Today, when dissembling the carbs, I noticed the front carb was missing the Lifter Piston (part #<font size="3" id="yui_3_16_0_1_1430588092886_4955"> </font></span><font size="3" id="yui_3_16_0_1_1430588092886_4954"><span style="font-family: Arial, Helvetica;" class="" id="yui_3_16_0_1_1430588092886_4857">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="yui_3_16_0_1_1430588092886_4465" dir="ltr"><span><br></span></div><div id="yui_3_16_0_1_1430588092886_4465" dir="ltr"><span id="yui_3_16_0_1_1430588092886_4806">Could that be creating a vacuum leak and cause of my issue?</span></div><div id="yui_3_16_0_1_1430588092886_4465" dir="ltr"><span><br></span></div><div id="yui_3_16_0_1_1430588092886_4465" dir="ltr"><span>Thanks,</span></div><div id="yui_3_16_0_1_1430588092886_4465" dir="ltr"><span id="yui_3_16_0_1_1430588092886_5026">Alan</span></div><div id="yui_3_16_0_1_1430588092886_4465" dir="ltr"><span><br></span></div><div id="yui_3_16_0_1_1430588092886_4465" dir="ltr"><span id="yui_3_16_0_1_1430588092886_5014">67-1600 (with a 67.5 engine)</span></div><div id="yui_3_16_0_1_1430588092886_4465" dir="ltr"><span id="yui_3_16_0_1_1430588092886_5045">Portland, OR</span></div><div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1430588092886_4568"><div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1430588092886_4567"><div class="y_msg_container" id="yui_3_16_0_1_1430588092886_4574"><br></div> </div> </div> </div></body></html>