Originally Posted by
2fst2c
Got a question for all you Go engine Guru's. I have a Gen5 5pt that is doing some strange stuff. I've been running these motors for a while now and this one has be confused. This thing has no low speed control. It's idle or wide open. One would think it was too lean but the needles are set richer than factory settings unless I am mistaken. HSN is flush which should be rich or about right. LSN is 1 turn out from flush. Got the short LSN in it. Idle gap is .9mm. I set it with the smooth side of a .035 drill bit. It will idle all day long. Run it on the track and it's wide open or idle. Blows plenty of smoke too. It's like there is a gap between idle and wide open where nothing happens. Makes it hard to work the technical areas of the track with no bottom to midrange. Any ideas besides throw an OS carb on it? Thanks.
If you have the short LSN then you are massively rich on the bottom end.
Long LSN will sit at around 1 turn in from flush
Short LSN will sit at around 1.75 to 2.5 in from flush normally
HSN at flush to .5 in from flush max, so your close there.
I am guessing when you gun it, it is so rich that it just bogs until the slide is open far enough to cope with the extra fuel and then it just takes off.
With a short LSN screwed that far out it is possibly not even in the spray bar at idle or low revs.
Try setting the LSN at 1.5 in from flush. This should get you running, then lean it in from there until you get a satisfactory bottom end and take off. Then fine tune the HSN a little for peak performance.