Originally Posted by
Franchize04
My tuned has about 3/4 of a gallon on it. The compression is very light. Wont even attempt to hold at 3 o'clock but it runs consistently as far as temps go and doesn't flame out. It does feel like Im chasing a tune b/c I can't quite get the lsn right. Sometimes it will rev while in the air (jump) and if I open the lsn a hair it wants to stall, so I open the idle gap and it will rev after idle. I kind of think I just need to get it pinched or buy a new p/s.
I had this happen with my tuned .21 too. It had approx 3 gal on it and I replaced everything from the front bearing to the button head to the plug. I even tried switching to GRP plugs as I have read about the angle sealing problem with other plugs. Nothing worked. I finally found a guy at my local track that is a guru in tuning. He spent about 1-2 min with it on the bench and it was really close after than. I still to this day don't know what he did but it solved the high revving/ lean sounding tune that I was getting before. 2 other things I would check. 1) the o-rings in the carb can let the needles get loose and sometimes they will move on their own. Easy fix - replace the o-rings. The HSN, LSN and idle needle should all have some tension on them, if they do not then they can move and cause you to chase a tune. 2) the idle needle is set too high. I have had my idle needle set too high and had a false idle happen. When the needle is set too high then my engine would rev high and not return to idle. It also would rev high even if it did return to idle. I would try lowering the idle and if that does not work then take the needles back to stock or to Drake recommended settings and go from there.