fouled plugs?

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fouled plugs?

19 Jun 2015 05:14 - 19 Jun 2015 05:16
#677240
#1,3,4 plugs black sooty but dry, and #2 plug clean and tan...what may be causing this? Also bike will not idle..and stumbles at low rpm. Cleaned and sealed tank, replaced inline filters, and fresh gas. On 76 900
1976 KZ 900 A4
Last edit: 19 Jun 2015 05:16 by oldsguy.

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Re: fouled plugs?

19 Jun 2015 09:02
#677267
Time for a tuneup, Carbs clean, check sync, Valve train ,check shim clearance , chain adjustment, timing, Compression test, Ignition , Points??? Factory manual ?
Dave B) B) B)

Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn

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Re: fouled plugs?

19 Jun 2015 09:10
#677268
Yup. B)
Steve
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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Re: fouled plugs?

19 Jun 2015 10:05
#677274
Thanks, just ordered shop manual..plugs are new, still has points, wires in good condition...
1976 KZ 900 A4

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Re: fouled plugs?

19 Jun 2015 10:22
#677275
Make sure it is a Kaw Factory Manual .
These bikes are easy to work on and can be a enjoyable time bonding with your scooter.
Just remember to triple check everything and NEVER assume a part is good or installed properly without checking it. Age alone , and who else has had their hands in the bike since it was built can explain many issues ..
Dave B) B) B)

Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn
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Re: fouled plugs?

19 Jun 2015 10:50
#677277
Thanks dave, ptoblem is..guy before me said top rnd was done..not sure what..so im kinda on my own guessing. Just trying to get past this fouling issue and enjoy it before tearing it apart.
1976 KZ 900 A4

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Re: fouled plugs?

19 Jun 2015 11:10
#677278
Check you valve adjustments to rule that out. Often the gasket can be reused. Just bop it with a rubber mallet, slide a blade around it ot the top and reseal with Copper silicon.
Steve
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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Re: fouled plugs?

19 Jun 2015 15:45
#677316
Checked compression cyl # 1-95, 2-100, 3-90, 4-85 lbs...bike started and ran with plugs 2,3 out seperately. Bike has 52000 miles not sure if its ever been rebuilt. Im assuming its in need of complete rebuild. Did test just turning bike over, read somewhere its supposed to be done at wot?
1976 KZ 900 A4

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Re: fouled plugs?

19 Jun 2015 15:57
#677317
Yes... Check valve lash first and correct that if they are too tight.
do it with no plugs. Wide open throttle.
Below 100psi is a sign It is well worn. But do it again with a little shot of oil in each cylinder and hold the throttle wide open
Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado
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Re: fouled plugs?

19 Jun 2015 17:22
#677332
If it's been sitting the compression could come up if running right. People don't want to do the valve adjustments, "too much hassle."
A very common issue.
Steve
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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