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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='color:windowtext'>Thanks David for the good info. I needed to order a few more things from Moss to get above their minimum $10 charge. I have the worthless wrench: my fingers can move the dang nut most of the time. Given your description, I do have HS carbs. I had porpoising like you described once; I was running low on gas. I think it can also be caused by the float bowls not adjusted correctly, but that is a guess.<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:windowtext'>Clayton<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='color:windowtext'>From:</span></b><span style='color:windowtext'> Mgs [mailto:mgs-bounces@autox.team.net] <b>On Behalf Of </b>David Ambrose via Mgs<br><b>Sent:</b> Tuesday, December 27, 2016 7:36 PM<br><b>To:</b> mgs@autox.team.net<br><b>Subject:</b> Re: [Mgs] Carbs still being nasty<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p><span style='font-size:12.0pt'><o:p> </o:p></span></p><p>You probably have HS-2s. HS carbs have a separate float bowl assembly. HIF carbs have the float bowl integral with the carb body. I don't think those were ever fitted to MGAs. <o:p></o:p></p><p>If you don't already have one, get an SU tool kit. It will have a couple of pointers you can attach to the pistons which will let you sync the carbs. It will have a wrench for the mixture adjustments, and most importantly, it will have a small tool to center the needle on the HS carbs. <o:p></o:p></p><p>And, if you get totally frustrated with that MG, I will give it a good home. :-) Selling *my* '62 MGA is one of the few regrets I have. <o:p></o:p></p><p>If it's any consolation, my first encounter with those carbs was anything but encouraging. Sitting there at idle, the engine would rev up to 2000 RPM, then drop to 900, and keep repeating. <o:p></o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>HTH,<br>Dave Ambrose<br><br><o:p></o:p></p><div><p class=MsoNormal>On 12/27/2016 12:52 PM, Clayton Kirkwood via Mgs wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal>I have no idea which kind of SU’s I have. This is on a 62A. How am I to tell?<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> PaulHunt73 [<a href="mailto:paulhunt73@virginmedia.com">mailto:paulhunt73@virginmedia.com</a>] <br><b>Sent:</b> Tuesday, December 27, 2016 12:45 AM<br><b>To:</b> <a href="mailto:crk@godblessthe.us">crk@godblessthe.us</a>; <a href="mailto:mgs@autox.team.net">mgs@autox.team.net</a><br><b>Subject:</b> Re: [Mgs] Carbs still being nasty<o:p></o:p></p></div></div><p class=MsoNormal> <o:p></o:p></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman ,serif",serif'>OK, twin SUs then, but HS or HIF?</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman ,serif",serif'> </span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman ,serif",serif'>Screw both the idle screws in until you can get it to idle, only then can you really have any chance of adjusting the air-flow balance and mixture.</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman ,serif",serif'> </span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman ,serif",serif'>If you still have problems getting it to idle, perhaps the mixtures are way out. The starting point is to screw the jets up until the top is flush with the bridge, then screw back down two full turns. You will probably also need some enrichment from the choke.</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman ,serif",serif'> </span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman ,serif",serif'>For air-flow balance yes when listening with a tube at the carb intakes if one carb is quieter than the other the quieter one needs the idle screw to be screwed in further until the sounds are as equal as you can judge. This should speed up the idle, so while doing that the louder carb may well need its screw unscrewed a little to keep the engine at a reasonable idle speed.</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman ,serif",serif'> </span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman ,serif",serif'>Whilst you can adjust for air-flow balance while the engine is warming you won't be able to adjust properly for mixture until the engine is fully up to temperature.</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman ,serif",serif'> </span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman ,serif",serif'>PaulH.</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman ,serif",serif'> </span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman ,serif",serif'> </span><o:p></o:p></p></div><blockquote style='border:none;border-left:solid black 1.5pt;padding:0in 0in 0in 4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>----- Original Message ----- </span><o:p></o:p></p></div><div><p class=MsoNormal style='background:#E4E4E4'><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>I can’t keep the engine running when tuning for both slow idle, it dies as soon as I start it. I have had some success listening through the rubber tube and there is significant difference. I presume the intake which sounds weaker needs the idle raised??</span><o:p></o:p></p></div><p class=MsoNormal> <o:p></o:p></p></blockquote><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman",serif'><br><br><br><o:p></o:p></span></p><pre>_______________________________________________<o:p></o:p></pre><pre><o:p> </o:p></pre><pre><a href="mailto:Mgs@autox.team.net">Mgs@autox.team.net</a><o:p></o:p></pre><pre>Donate: <a href="http://www.team.net/donate.html">http://www.team.net/donate.html</a><o:p></o:p></pre><pre>Suggested annual donation $12.75<o:p></o:p></pre><pre>Archive: <a href="http://www.team.net/archive">http://www.team.net/archive</a><o:p></o:p></pre><pre>Forums: <a href="http://www.team.net/forums">http://www.team.net/forums</a><o:p></o:p></pre><pre>Unsubscribe: <a href="http://autox.team.net/mailman/options/mgs/stargazer1@cox.net">http://autox.team.net/mailman/options/mgs/stargazer1@cox.net</a><o:p></o:p></pre></blockquote><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman",serif'><o:p> </o:p></span></p></div></body></html>