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<P>Bill - </P>
<P>First the starter issue - a BP starter will start this engine and most any other up to and including a 23cc gasser. </P>
<P>Second - is there any reason you've decided you need a pump on your AX? I recently completed my GiantScalePlanes Swallow 90 with the 120AX -- (with the head at about 8:00)<FONT style="FONT-SIZE: 11px; FONT-FAMILY: tahoma,sans-serif"> which is about the same size and config as a Quest and it doesn't need a pump. Tank is on the firewall; engine tunes fine and draws fuel fine with stock carb and muffler pressure. </FONT></P>
<P><FONT style="FONT-SIZE: 11px; FONT-FAMILY: tahoma,sans-serif">This setup gives me all the vertical I could want (duh... a 120 on an 8-1.2 lb plane- yah...) with no indication at all that there's a fuel feed condition. </FONT></P>
<P>Might be easier to go back to stock setup and just fly? </P>
<P>my $.02...hope to see you this weekend! </P>
<P>Rick </P>
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<DIV></DIV>From: <I>Bill Markovitz <wdmarko@yahoo.com></I><BR>Reply-To: <I>NSRCA Mailing List <nsrca-discussion@lists.nsrca.org></I><BR>To: <I>nsrca-discussion@lists.nsrca.org</I><BR>Subject: <I>[NSRCA-discussion] OS120AX Run/Set-Up Problem</I><BR>Date: <I>Tue, 12 Sep 2006 11:35:44 -0700 (PDT)</I><BR>>HI....I have a new OS120AX that I put in a Quest<BR>>airplane. The engine is mounted inverted. The fuel<BR>>tank is at the airplane CG and I'm using a VP-30 Perry<BR>>regulataing punp. I have the low end needle valve (OS<BR>>calls it the mixture control valve) at it's maximun<BR>>lean position, but it isn't lean enough. I had the<BR>>same problem with an OS50SX and fixed the problem by<BR>>modifying the low end needle valve so that it could
be<BR>>adjusted beyound the designed maximum lean position.<BR>>The 120 is a different design and cannot be fixed the<BR>>same way. The basic problem is that the Perry pump is<BR>>putting out too much pressure at the minimum presssure<BR>>setting and this results in too much fuel being<BR>>delivered at idle. If the taper on the main needle<BR>>valve was changed to allow it to engage deeper into<BR>>the mixture control valve at the idle setting, this<BR>>would fix the problem, however, I'm not sure I could<BR>>accurately and precisely change the taper. Any<BR>>suggestions?<BR>><BR>> Also, my starter doesn't have enough torque to turn<BR>>over the 120, so I have been starting it by hand. The<BR>>problem here is that I cannot start it with the engine<BR>>inverted. The fuel just
drips out of the carburator<BR>>(onto the ground) and is not sucked into the engine.<BR>>When I turn the airplane up side down it consistently<BR>>starts with the first flip. Obviously I need a higher<BR>>torque starter so that a higher turning rate (RPM)<BR>>will develop the sucking powrer to pull the fuel into<BR>>the engine. Any suggestions on a starter that will do<BR>>the job?<BR>><BR>>Thanks in advance for your help.<BR>><BR>>...................Bill :(<BR>><BR>>__________________________________________________<BR>>Do You Yahoo!?<BR>>Tired of spam? Yahoo! Mail has the best spam protection around<BR>>http://mail.yahoo.com<BR>>_______________________________________________<BR>>NSRCA-discussion mailing list<BR>>NSRCA-discussion@lists.nsrca.org<BR>>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<BR></FONT></BLOCKQUOTE></div></html>