<HTML><BODY STYLE="font:10pt verdana; border:none;"><DIV>lhncheol</DIV> <DIV>When you open the throttle don't let it go wide open to the stops. This will be a lean condition. Always adjust full throttle for barrel to be straight up and down, not all the way open. This is really important with a Hyde or similar mount that will stretch under full power.</DIV> <DIV> For the spinner use double prop nuts. One nut will lock the prop nut. I also use washers to space the spinner so that the spinner bolt tightens against the nut without bending the backplate.</DIV> <DIV> If you hear that loud hammering or pinging you are lean. That's why it throws the props and spinner. Don't let it do that.</DIV> <DIV> The first tank on a rebuilt or new engine should be well on the rich side. After that put in plane and fly, slowly leaning engine for a few flights. The engines get more cooling in the air.</DIV> <DIV> There is a method to set the low end at 2000 rpm and to set max rpm. I will let someone else talk about that.</DIV> <DIV> </DIV> <DIV>Jim Ivey</DIV> <DIV> </DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt Arial">----- Original Message -----</DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt Arial; COLOR: black"><B>From:</B> Ihncheol Park</DIV> <DIV style="FONT: 10pt Arial"><B>Sent:</B> Sunday, June 01, 2003 9:13 PM</DIV> <DIV style="FONT: 10pt Arial"><B>To:</B> NSRCA</DIV> <DIV style="FONT: 10pt Arial"><B>Subject:</B> YS 140L tuning questions</DIV> <DIV> </DIV>OK, finally, I got all the parts installed including the updates.<BR>Here is the current setting.<BR>Idle screw and 2 turn out.<BR>High speed at 2 turn out.<BR>Regulator screw 1/4 turn out from flush with case.<BR>The engine is mounted upright on a stand with AAP muffler.<BR>Magnum #2, APC 15x12W. (I listened to Troy Newman and bought the props!!)<BR><BR>I had to use music wire support from mount to the muffler because it kept<BR>come loose within a minute of running.<BR><BR>At idle, the engine spits fuel out of carb a lot as in rich condition.<BR>Going fine up to 2/3 throttle.<BR>When near the full throttle, there is a sharp "Ping~" sound. Spinner and<BR>prop got loose (tru-turn nuts are still on the shaft). Fortunately, the<BR>spinner cone was not damaged for the last 5 attempt. (the cone came loose<BR>twice flying upto 15 feet).<BR><BR>Am I still lean?<BR>Compression is very strong even with 3 head gaskets. Before running, there<BR>was almost no compression and had a little of hard time starting with<BR>chicken stick. (Excellent excercise on my right arm. I could not use kavan<BR>starter because of very sticky soft cone staying on the spinner.).<BR><BR>Now, I am afraid if I will damage the engine.<BR>What is a good way to keep the spinner and prop not to come loose?<BR><BR>Any suggestions?<BR><BR>Thank you,<BR><BR>Ihncheol Park<BR><BR><BR><BR><BR>=====================================<BR># To be removed from this list, send a message to <BR># discussion-request@nsrca.org<BR># and put leave discussion on the first line of the body.<BR>#<BR><BR></BLOCKQUOTE></BODY></HTML>