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inconsistant plugs
- asevans
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1976 kz900 Mostly stock
1978 Z1-R Project
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- TeK9iNe
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- What did you do!?!
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It can also be a clogged air/pilot jet.
An air leak on the "better" cylinders.
Have you properly tuned your mixture screws?
Are your valve clearances ok?
Check engine compression as well.
Changing the mains wont have any affect unless your riding the bike consistantly in the 2/3rds to WOT position.
When do they foul? What rpm range, and most importantly the throttle position?
GL.
Motorcycle Shop Owner/Operator
79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors
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- MFolks
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Tried changing brands of sparkplugs? For my bike I use either NGK B8ES or Denso W24-ESU gapped .028" to .032".
1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)
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- otakar
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74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
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- Patton
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- KZr Legend
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Compression (and valve clearances);
Ignition (properly timed fat blue spark);
Fuel level (clear tube test);
Pilot air screw adjustments (default is 1.25 turns out from lightly seated; out more gets leaner);
Some pods obstruct entrance to pilot air passage;
Pods might be over-oiled;
Air box filter may be dirty or blocked by something stored under the seat.
Good Fortune!
1973 Z1
KZ900 LTD
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- asevans
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1976 kz900 Mostly stock
1978 Z1-R Project
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- asevans
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1976 kz900 Mostly stock
1978 Z1-R Project
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- otakar
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74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
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- asevans
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1976 kz900 Mostly stock
1978 Z1-R Project
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- bountyhunter
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A bad coil will do this, don't remember if the same coil feeds 2-4?been having problems with my plugs. fouling out my number 2. about every 30 miles. also number 4 is really black with carbon. 1 & 3 arent bad. lowered my main from 120 back to 117.5. pilot it 17.5 needle jet up one notch. i dont think it is my jets. because there are not all the same. could this be because i havent synced my carbs?
1979 KZ-750 Twin
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- otakar
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74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
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- Old Man Rock
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Possibly coils but I didn't catch where points/condenser or Dyna... Nor did I catch what is the coil voltage (Vdc) measuring in at.
Possibly oxidized engine ground....
OMR
1976 KZ900-A4
MTC 1075cc.
Camshafts: Kawi GPZ-1100 .375 lift
Head: P&P via Larry Cavanaugh
ZX636 suspension
MIKUNI, RS-34'S...
Kerker 4-1, 1.5" comp baffle.
Dyna-S E.I.
Earls 10 row Oil Cooler
Acewell 2802 Series Speedo/Tach
Innovate LC1 Wideband 02 AFR meter
Phoenix, Az
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