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Author Topic: too lean or to rich  (Read 744 times)

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Offline neilc

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too lean or to rich
« on: August 11, 2013, 01:01:40 PM »
With d8es plugs they get sooty and foul, d7eas now way to lean
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Offline goldarrow

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Re: too lean or to rich
« Reply #1 on: August 11, 2013, 01:10:49 PM »
What bike? Carbs thoroughly cleaned? Try denso x24es-u?
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Life Is Full Of Challenges - And My Backyard Is Full Of SOHC4's

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CB750 K0, K2, K23 JDM, K45, K5
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Offline Stev-o

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Re: too lean or to rich
« Reply #2 on: August 11, 2013, 01:55:08 PM »
Sounds like your jetting is off
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline bjbuchanan

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Re: too lean or to rich
« Reply #3 on: August 11, 2013, 02:56:20 PM »
Quote from: Stev-o on August 11, 2013, 01:55:08 PM
Sounds like your jetting is off

I agree, one of those should be "better" atleast, not ends of the spectrum. What ranges are you testing
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The dirty girl-1976 cb750k, Ebay 836, Tracy bodykit
Round top carbs w/ 38 pilots, middle needle position, airscrew 7/8ths out, 122 main jet
Stock airbox w/ drop in K&N, Hooker 4-1

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Offline neilc

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Re: too lean or to rich
« Reply #4 on: August 11, 2013, 03:05:57 PM »
Rebuilt carbs,with same issue am running 130 main jet needle position in middle,was running 140 main with no popping but fouling plugs,I think I,'ll go back to 140 don't want to burn up valves,does anyone have 1 140 main jet,I damaged 1 when taking it out,1971 cb750k1
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Offline Xnavylfr

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Re: too lean or to rich
« Reply #5 on: August 11, 2013, 06:01:04 PM »
Are you reading these plugs after a plug chop or after a normal ride???  Plus if you use your choke to help start the bike it will tend to show as fouling the plugs. Do a plug chop and then read the plugs , if they are still sooty move your main needle clip UP 1 slot, this will allow LESS fuel to flow!! With the 140 mains.


Xnavylfr(CHUCK)


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