The lift-the-piston method of tuning only works on pre-emissions carbs (SU). That is because the SU needles were profiled to do that. However that makes them run too rich to meet US emissions standards.<div><br></div><div>The factory method is to use a gas sniffer. So, yes, you should borrow a Gunson or similar device.</div><div><br></div><div>Dave<br><br><div id="ymail_android_signature"><a id="ymail_android_signature_link" href="https://play.google.com/store/apps/details?id=com.aol.mobile.aolapp">Sent from AOL on Android</a></div> <br> <blockquote style="margin: 0 0 20px 0;"> <div style="font-family:Roboto, sans-serif; color:#6D00F6;"> <div>On Sat, Sep 21, 2024 at 17:59, dave northrup</div><div><dave@ranteer.com> wrote:</div> </div> <div style="padding: 10px 0 0 20px; margin: 10px 0 0 0; border-left: 1px solid #6D00F6;"> <div id="yiv2097059035">
<div dir="ltr">
<div id="yiv2097059035divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:Calibri, Helvetica, sans-serif;" dir="ltr">
<p>i have a 72 TR6 with triple carbs. the engine now has about 400 miles on it, and i am pretty sure the carbs are too rich.</p>
<p><br>
</p>
<p>i am aware of the lift-a--piston method of tuning the carbs.</p>
<p><br>
</p>
<p>i am wondering if it is worth getting a gunson tuning setup or what is the best method for ensuring the carbs are correctly tuned.</p>
<p><br>
</p>
<p>i know i need to ascertain the valve gap and timing first.</p>
</div>
</div>
</div>** <a ymailto="mailto:triumphs@autox.team.net" href="mailto:triumphs@autox.team.net">triumphs@autox.team.net</a> **<br><br>Donate: <a href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a><br>Archive: <a href="http://www.team.net/pipermail/triumphs" target="_blank">http://www.team.net/pipermail/triumphs</a> <a href="http://www.team.net/archive" target="_blank">http://www.team.net/archive</a><br><br>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/triumphs/dave1massey@cs.com" target="_blank">http://autox.team.net/mailman/options/triumphs/dave1massey@cs.com</a><br> </div> </blockquote></div>