Best Way to set the idle mix on a 4160

steve meltzer · #1 (**permalink**) 03-02-2018, 05:33 PM

Patrick, thanx again. let me digest this and get some wrench time in, hopefully, this weekend. my life and job are interfering with my fun. s

patrickt · #2 (**permalink**) 03-02-2018, 06:14 PM

Quote:

Originally Posted by steve meltzer

Patrick, thanx again. let me digest this and get some wrench time in, hopefully, this weekend. my life and job are interfering with my fun. s

Alright, get cracking... and remember the Club Cobra Credo: "See One, Do One, Brag About One."

steve meltzer · #3 (**permalink**) 03-02-2018, 07:08 PM

Hmmm....vaguely like my residency training...see one, do one, teach one...
and our credo: we teach the unteachable, train the untrainable and accept the unacceptable.

s
(now sporting a tee-shirt with a frog that says "don't croak on my shift")

steve meltzer · #4 (**permalink**) 03-03-2018, 10:23 AM

OK, carb off, but I can't get the primary butterflies to close anywhere near the "perfect little square" that closes the transition slot the way it should be. Primary idle speed screw is all the way out. thanx. s

steve meltzer · #5 (**permalink**) 03-03-2018, 11:22 AM

Me bad and dumb...choke was in play! Now my problem is that the blades don't close evenly. It's slightly tighter on the left (driver's side). Can this be adjusted so that they close evenly? I would hope so. is it the "stake" screws that screw into butterfly itself, on the bottom of said butterfly? thanx, supernovice, steve

patrickt · #6 (**permalink**) 03-03-2018, 01:05 PM

OK, I think you are saying that your throttle plates are either not closing evenly, or they are out of whack somehow, or that they are not both even with their respective transition slots. If that is true, they don't really "adjust" all that much, but maybe you have some carbon build-up or something. Now I have heard of carbs that don't have the transfer slots even and that's because of a milling QC issue from Holley.

What I would do is follow the "generic" throttle plate instructions that are here: http://www.jegs.com/InstallationInst...-26-93-100.pdf and just clean them up good, maybe do a little filing if they are rough on the edges, and then perform the "light bulb" test. Just get them as smooth as possible and, if the transition slots are not that even, then so be it. Just set the biggest one's opening to a square and leave the other one wherever it lands. Smoothness in the opening and closing is the key though.

EDIT -- Here's a nice thread, with lots of pics, dealing with the joy of throttle plate fixin' on our 4160 carbs: http://www.mastercraft.com/teamtalk/...ad.php?t=54417

steve meltzer · #7 (**permalink**) 03-03-2018, 02:25 PM

they're reasonably close, but i'll take a look and keep you posted. thanx again. s