[NSRCA-discussion] YS 140 help

[BUDDYonRC at aol.com]

It sounds like the low end is to rich try opening the low end needle about  a 
turn at a time, each time you do this reset the high end to Max rpm then back 
 it off about two or three clicks. Bring it down to idle say 2500 rpm hold at 
 that position for 30 seconds then go to full throttle. if it smokes and 
stutters  coming up it is still rich if it hesitates with little exhaust smoke it 
is to  lean if it is rich repeat the procedure and continue to lean out the 
low end by  opening the low end needle a little at a time. The first YS-140  
sports had to small an opening in the low end carb barrel baffle  that required 
it to be drilled out to 1/8 inch diameter and caused similar  problems. 
Assuming all else is OK with the engine this should work I have had to  do this for 
several people who have had this problem and it worked every  time. Also the 
YS140 loves High Nitro fuel I am running Magnum-2 mine turns 9000  rpm on a good 
day with a 16x11 APC prop. Good luck
Buddy
PS. Some YS-140's require five turns out on the low end  needle.
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