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Author Topic: help me read these plugs  (Read 1169 times)

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Offline DYSKORD

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help me read these plugs
« on: January 07, 2011, 12:46:34 PM »
need help diagnosing the condition of these plugs. Pods, 4-1, 76cb750f. What do you think?
Plug order #4-1, left to right first pic. Second pic is #1-4.
Thanks guys
« Last Edit: January 07, 2011, 12:54:41 PM by DYSKORD »
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Offline Mark M

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Re: help me read these plugs
« Reply #1 on: January 07, 2011, 12:50:37 PM »
Rich, less on no2 but still way to dark for optimum running
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Offline fire113

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Re: help me read these plugs
« Reply #2 on: January 07, 2011, 12:59:15 PM »
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Offline Flying J

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Re: help me read these plugs
« Reply #3 on: January 07, 2011, 01:02:32 PM »
Are the carbs synced?
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Offline DYSKORD

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Re: help me read these plugs
« Reply #4 on: January 07, 2011, 01:07:41 PM »
did a rushed sync job so need to be resynced but arent too far off.
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Offline flybox1

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Re: help me read these plugs
« Reply #5 on: January 07, 2011, 01:13:05 PM »
def rich +/- across the board. re-sync,  get them spot on.
at what throttle position was the cutout for these pics?

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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 DYSKORD

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Re: help me read these plugs
« Reply #6 on: January 07, 2011, 01:18:47 PM »
Quote from: flybox1 on January 07, 2011, 01:13:05 PM
def rich +/- across the board. re-sync,  get them spot on.
at what throttle position was the cutout for these pics?


Sorry I should have mentioned, these were pulled from the motor 2000 miles after a fresh top end (1mm over) and carb rebuild. Not a proper plug chop situation.
« Last Edit: January 07, 2011, 01:20:43 PM by DYSKORD »
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Offline TwoTired

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Re: help me read these plugs
« Reply #7 on: January 07, 2011, 01:28:48 PM »
Looks like lots of idling, too much choke operation, engine never/seldom getting to operating temperature, filter clogged/restrictive, or the pilot adjust, Slide needle, or main jet may be too rich.
Emulsion tubes could be clogged or the air jet circuit restrictive.
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

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Offline Flying J

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Re: help me read these plugs
« Reply #8 on: January 07, 2011, 01:49:18 PM »
Quote from: TwoTired on January 07, 2011, 01:28:48 PM
Looks like lots of idling, too much choke operation, engine never/seldom getting to operating temperature, filter clogged/restrictive, or the pilot adjust, Slide needle, or main jet may be too rich.
Emulsion tubes could be clogged or the air jet circuit restrictive.
what he said. Nice profile pic TT   :P
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Offline Mark M

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Re: help me read these plugs
« Reply #9 on: January 07, 2011, 01:56:12 PM »
There isn't a lot of point in trying to read anything much from them without doing a proper running temp plug chop.
Just pulling them out and having  look is for when you are trying to work out why it's not running - I.E. Wet/Dry/Oiled/worn out/gap etc
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Offline DYSKORD

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Re: help me read these plugs
« Reply #10 on: January 07, 2011, 01:58:29 PM »
Quote from: Mark M on January 07, 2011, 01:56:12 PM
There isn't a lot of point in trying to read anything much from them without doing a proper running temp plug chop.
Just pulling them out and having  look is for when you are trying to work out why it's not running - I.E. Wet/Dry/Oiled/worn out/gap etc
Understood, thanks. I will be back with more/different pictures.
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Offline flybox1

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Re: help me read these plugs
« Reply #11 on: January 07, 2011, 02:05:32 PM »
WOT chop comes first  ;)
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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…"
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