Topic: carbs

[KRONUS0100]

this set up works best for my bike. 120 mains, 40 pilots, I run a Mac 4 into 1 headpipe with a 28" long Thrush glasspack 2 1/2" in diameter. This runs ever so slightly rich, idles well, and will get the power to the rear wheel. I use a mercury synchronizer to fine tune and balance the carbs. My stock mains were 110, no power.

[RFogelsong]

what filter setup are you using with these jets?

(pods/k&n airbox/drilled airbox/original setup/etc.)

[KRONUS0100]

oops. sorry.  running stock airbox with K&N filter.76 CB750F.

[lucky]

this set up works best for my bike. 120 mains, 40 pilots, I run a Mac 4 into 1 headpipe with a 28" long Thrush glasspack 2 1/2" in diameter. This runs ever so slightly rich, idles well, and will get the power to the rear wheel. I use a mercury synchronizer to fine tune and balance the carbs. My stock mains were 110, no power.

And which bike would that be?

[lucky]

this set up works best for my bike. 120 mains, 40 pilots, I run a Mac 4 into 1 headpipe with a 28" long Thrush glasspack 2 1/2" in diameter. This runs ever so slightly rich, idles well, and will get the power to the rear wheel. I use a mercury synchronizer to fine tune and balance the carbs. My stock mains were 110, no power.

What year and which style carbs?
Mixture screw turns ?

So we have...
1976 CB750F.
120 mains.
Idle jet #40mm
4 into 1 MAC.
28 inch thrush glass pack. (very restrictive)
running stock airbox with K&N filter.
Still missing OnE THING....Needle clip position??

See we all want the whole story. Not part of it.

I bet if you changed to a 12 inch glass pack it would not run so rich.
You said the glass pack was 2-1/2 inches. Is it a glass pack baffle insert?
Some confusion there.

[dirty rat]

will it work with four into 2 pipes

[KRONUS0100]

sorry for delay in response.  bike is a 76 750F.  Now has factory 4 into 1 header to go with the 28 inch thrush glasspack ( same as used on any pickup or musclecar).  needle clip is 1 notch under center position.  I fail to see how a straight thru glasspack is restrictive?  the bike has a real nice low rumble sound and is not very loud.