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Do I have too much fuel in my bowls?

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Voting closed: March 29, 2009, 06:49:11 PM

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Author Topic: 350F actual fuel level in bowls  (Read 717 times)

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Offline fmctm1sw

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350F actual fuel level in bowls
« on: March 15, 2009, 06:49:11 PM »
My bike had a lot of hesitation above idle.  It idled great and full throttle was great as well.  Between was kind of a mystery, mostly when trying to accelerate from low speeds.  Today I went for a ride without the filter and it ran much better.  I pulled plug #1 after my ride and it was still carboned up.  This thread got me thinking:  http://forums.sohc4.net/index.php?topic=37851.msg390105#msg390105
So I checked my level.  Now, I assure you I set all these when I was building the bike but this looks way higher than then the one I saw in the other thread.  All 4 of my bowls should be about the same.  Too high?  I have a new air filter on the way too...
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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 Bob Wessner

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Re: 350F actual fuel level in bowls
« Reply #1 on: March 15, 2009, 06:54:31 PM »
Seems a tad high to me. Did you physically check the float heights? I have no idea what the spec is for your model though.
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Offline fmctm1sw

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Re: 350F actual fuel level in bowls
« Reply #2 on: March 15, 2009, 06:58:16 PM »
Quote from: Bob Wessner on March 15, 2009, 06:54:31 PM
Seems a tad high to me. Did you physically check the float heights? I have no idea what the spec is for your model though.

I did them all when I put the carbs back together, something like 21 or 22?  I had my book with me so I'm certain it was right on..
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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 CrashBar

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Re: 350F actual fuel level in bowls
« Reply #3 on: March 16, 2009, 06:49:47 PM »
21mm for the CB350F (just did mine yesterday).  That pic looks wicked high.

I pulled my carbs, flipped them over, and measured that way.

I bought the gauge from Z1, although just using a venier caliper seemed to do the trick as well.

If you remove all the airbox bolts and slide the whole thing back, it makes it easier to remove all the plumbing.

Still a major PITA, but easier than swapping the battery in a K1100 :D  At least the first time...
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....to trade in these wings on some wheels...

2017.5 BMW R1200GS
1973 CB350F
1978 CB550K
1973 TR5T

Offline OakBehringer

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Re: 350F actual fuel level in bowls
« Reply #4 on: March 16, 2009, 07:12:08 PM »
How old are the float shut-off valves? If they're as old as your bike, they might compress easier than when the bike was new. You set your float height to 21mm dead on, but the springs are weaker so the fuel level is higher.

Another possibility is that you measured 21mm on one side of the float, but in it's old age the other side is not totally level.

Time to take the carbs off again.

Nice for you.
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1974 350 Four - SOLD
1966 CL160
1981 XS650
1972 CT70

Finished CB350F

HELLS BANANAS

Offline Hush

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Re: 350F actual fuel level in bowls
« Reply #5 on: March 16, 2009, 08:05:13 PM »
Good call on the air filter, change it before you do anything else and see if you cured your problem.
Made a massive difference to my bike, I'll never trust an old air filter again.
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I think the thing I most like about motorcycling is the speed at which my brain must process information at to avoid the numb skulls who are eating pies, playing the ukulele, applying make-up etc in the comfort of their airconditioned armchairs as they make random attempts to kill me!!!!!!!
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