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Author Topic: 1973 HONDA CB350F CARB SYNC  (Read 7408 times)

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Offline harisuluv

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Re: 1973 HONDA CB350F CARB SYNC
« Reply #25 on: November 24, 2015, 12:16:53 PM »
no YOUR carbs:

Clockwise = Richer
Counterclockwise = Leaner
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Offline jetthugo

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Re: 1973 HONDA CB350F CARB SYNC
« Reply #26 on: November 24, 2015, 12:22:10 PM »

Quote from: harisuluv on November 24, 2015, 12:16:53 PM
no YOUR carbs:

Clockwise = Richer
Counterclockwise = Leaner
Got it! Thanks


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Offline Scott S

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Re: 1973 HONDA CB350F CARB SYNC
« Reply #27 on: November 24, 2015, 12:44:11 PM »
 You're using the idle mixture screws to sync. That's wrong. There are screws with lock nuts on the linkage that you use.
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'71 CB500 K0
'17 Triumph Street Scrambler
'81 Yamaha XS650

Offline Scott S

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Re: 1973 HONDA CB350F CARB SYNC
« Reply #28 on: November 24, 2015, 12:47:17 PM »
 This is a CB550, but if you skip to ~3:45, you can see the screws I'm talking about. They're similar on your bike.

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'71 CB500 K0
'17 Triumph Street Scrambler
'81 Yamaha XS650

Offline jetthugo

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Re: 1973 HONDA CB350F CARB SYNC
« Reply #29 on: November 24, 2015, 12:54:09 PM »
Quote from: Scott S on November 24, 2015, 12:44:11 PM
You're using the idle mixture screws to sync. That's wrong. There are screws with lock nuts on the linkage that you use.
Yea those screws in the video are the screws I turned to sync the carbs. Two on each side.  Loosened the locknut, turned the screw and once the carbs were matched, tightened the locknuts back up. Isn't that how it's done for the vacuum carb sync?
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Offline Scott S

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Re: 1973 HONDA CB350F CARB SYNC
« Reply #30 on: November 24, 2015, 01:06:56 PM »
 OK.... you kept saying the idle screws (also called IMS or idle mixture screws, or air screws), the ones on the body of the carbs. You DID use the ones on the linkage, right?
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'71 CB500 K0
'17 Triumph Street Scrambler
'81 Yamaha XS650

Offline flybox1

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Re: 1973 HONDA CB350F CARB SYNC
« Reply #31 on: November 24, 2015, 01:19:42 PM »
Quote from: harisuluv on November 24, 2015, 12:16:53 PM
IN Clockwise = Richer
OUT Counterclockwise = Leaner
yes, this is what I said.
its like RONCO Rotisserie ....Set it and forget it!

you have many carb screws
Idle set screw (1)....controls slide height for all carbs at the same time - finger control of idle speed
mixture screws (4) -  depending on your carb, underneath or the outer top edge of the carbs, they meter air or fuel and assist in achieving proper A/F mixture at idle.
vacuum sync screws (4)- depending on carb model, under top caps or between carb tops.  they make micro-height adjustments of the individual carb slide height, to control (sync) carb throat vacuum
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline jetthugo

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Re: 1973 HONDA CB350F CARB SYNC
« Reply #32 on: November 24, 2015, 01:21:55 PM »
Quote from: Scott S on November 24, 2015, 01:06:56 PM
OK.... you kept saying the idle screws (also called IMS or idle mixture screws, or air screws), the ones on the body of the carbs. You DID use the ones on the linkage, right?
Not sure what you mean by linkage, but the screws I adjusted were these..
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Offline flybox1

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Re: 1973 HONDA CB350F CARB SYNC
« Reply #33 on: November 24, 2015, 01:29:00 PM »
^^ correct.  those are the screws used to vacuum sync the carbs.
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline jetthugo

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Re: 1973 HONDA CB350F CARB SYNC
« Reply #34 on: November 25, 2015, 10:30:16 AM »
My bike has been running great these past few days. Thank you everyone for sharing your knowledge and tips!


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