Author Topic: 1973 CB350F running rich  (Read 1721 times)

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Offline PeteyWash

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1973 CB350F running rich
« on: July 30, 2012, 12:15:34 PM »
Hey guys,

I have a 1973 CB350F in pretty good condition, but I have trouble with running fuel rich.  I bought this motorcycle as my first bike in March when I bought it it had pod filters on it with what seemed to be the stock exhaust (4-1).... anyways.  I expected it to run lean due to the pods, but it has been running rich.  I have adjusted the air screws and changed spark plugs, but the bike still runs rich.  Do I need to re-jet my carbs?  If so, I could use some help because I'm not sure about how to go about that. 

Offline Teatimetim

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Re: 1973 CB350F running rich
« Reply #1 on: July 30, 2012, 12:27:30 PM »
My guess would be that who ever put the pods on, rejeted the carbs and went to big.
Bikes I own:

1974 CB550K
1971 CB450

Offline fmctm1sw

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Re: 1973 CB350F running rich
« Reply #2 on: July 30, 2012, 12:48:19 PM »
There have been a number of 350F folks who have lowered their float level to 23 and I think even 24.  You have an added obstacle of pods though too and the 4-1 exhaust isn't stock for that bike.  If you get into the carbs, please make a note of your jet sizes.  It will save you headaches when you pick up more bikes or have to get back into the carbs.  And I think Lucky has been interested in collecting folks' carburation set ups too.
Quote from: 754
Dude is that a tire ? or an O-ring..??

Quote from: inkscars
This is not a pod thread
This is not a #$%* on my vacuum gauges thread
This is a help or GTFO thread.

1973 CB350F
1973 CB350G
1975 CB550K
1983 GL650I
1973 CB750K3 (http://forums.sohc4.net/index.php?topic=92888.0)
1984 Kawasaki KLT-250 (AKA 3 wheeler of death)
1994 Honda TRX300
1999 Honda TRX250

Offline flybox1

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Re: 1973 CB350F running rich
« Reply #3 on: July 30, 2012, 01:04:05 PM »
Time to pull the carbs and see what is in there.
stock is #35/#75 jets
stock was 4 into 4 exhausts.

with pods and a 4 into 1 exhaust, #35's will be ok(with air screws out to about 1.75 turns), and mains at 90's or 100's...
if there are 120's or bigger mains in there, you'll need to come back down to ~100's

'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 mineā€¦"

Offline Sniper X

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Re: 1973 CB350F running rich
« Reply #4 on: July 30, 2012, 01:59:58 PM »
Yep, being at sea level would mean a step or two richer at most with a header and pods. I'd stay a tad on the lean side so when you increase altitude ever it will still run well. What about the needles?
1973 CB350 Four, 1969 CL350 Scrambler (2) 1985 BMW R80RT.

Offline PeteyWash

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Re: 1973 CB350F running rich
« Reply #5 on: July 30, 2012, 03:16:24 PM »
Thanks guys.  I haven't opened up my carbs and taken a look at them yet, so it looks like I will get around to this on friday or saturday.  Btw, you guys have been awesome, but where would I get new carb jets?

Offline fmctm1sw

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Re: 1973 CB350F running rich
« Reply #6 on: July 30, 2012, 08:56:52 PM »
Thanks guys.  I haven't opened up my carbs and taken a look at them yet, so it looks like I will get around to this on friday or saturday.  Btw, you guys have been awesome, but where would I get new carb jets?

SCI or Sudco
Quote from: 754
Dude is that a tire ? or an O-ring..??

Quote from: inkscars
This is not a pod thread
This is not a #$%* on my vacuum gauges thread
This is a help or GTFO thread.

1973 CB350F
1973 CB350G
1975 CB550K
1983 GL650I
1973 CB750K3 (http://forums.sohc4.net/index.php?topic=92888.0)
1984 Kawasaki KLT-250 (AKA 3 wheeler of death)
1994 Honda TRX300
1999 Honda TRX250