testy

Author Topic: carbs  (Read 4219 times)

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Offline KRONUS0100

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carbs
« on: December 18, 2007, 11:59:34 am »
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.
MATT
current bikes:  1976 CB750F, 1981 GS1100E
bikes owned:1981 GL1100I, 1990 GS500E, 1981 GS850, 1977 and 1979 GS750, 1974 CB750, 1975 CB750, and a 1982 GS750E

Offline RFogelsong

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Re: carbs
« Reply #1 on: December 07, 2011, 11:34:51 pm »
what filter setup are you using with these jets?

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

Hondas past/present:
SOHC1:'74 CB125, '78 XL125
DOHC2:'71 CB450K
SOHC4:'73 350F, '75 400F, '75 550K
DOHC4:'81 900F, '01 1100XX
V4:'85 VF1000R, '86 VF500F, '08 VFR800

Offline KRONUS0100

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Re: carbs
« Reply #2 on: December 09, 2011, 11:17:16 am »
oops. sorry.  running stock airbox with K&N filter.76 CB750F.
MATT
current bikes:  1976 CB750F, 1981 GS1100E
bikes owned:1981 GL1100I, 1990 GS500E, 1981 GS850, 1977 and 1979 GS750, 1974 CB750, 1975 CB750, and a 1982 GS750E

Offline lucky

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Re: carbs
« Reply #3 on: January 06, 2012, 11:24:54 am »
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?

Offline lucky

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Re: carbs
« Reply #4 on: February 01, 2012, 09:20:38 pm »
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.
« Last Edit: February 01, 2012, 09:28:47 pm by lucky »

dirty rat

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Re: carbs
« Reply #5 on: February 02, 2012, 02:18:28 am »
will it work with four into 2 pipes

Offline KRONUS0100

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Re: carbs
« Reply #6 on: July 01, 2012, 03:39:03 pm »
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.
MATT
current bikes:  1976 CB750F, 1981 GS1100E
bikes owned:1981 GL1100I, 1990 GS500E, 1981 GS850, 1977 and 1979 GS750, 1974 CB750, 1975 CB750, and a 1982 GS750E

 

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