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Spark plug problems 16 Aug 2021 11:56 #853897

  • Pichu1214
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Hello KZ Riders,

if any one know what going on my kz1000.

I change the carburetor to a New one (Murrays Carbs) and a still have the same problem with the sprkplug. 

Im using Motogadget M unit , New coils 3ohm, New regulator and New stator .

This is how my sparkplugs end  of a couple of short rides 




 
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Last edit: by SWest.

Spark plug problems 16 Aug 2021 12:15 #853900

  • Warren3200gt
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Either very rich, burning oil or weak spark. As you have changed carbs without it changing the symptoms burning oil or weak spark is likely unless they are very cool plugs.

What spark plugs and what grade are they?
Are you getting any smoke from the exhaust.
have you checked spark gap and power to the coils?

Z1000J2 somewhat modified!


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Last edit: by Warren3200gt.

Spark plug problems 17 Aug 2021 06:45 #853924

  • JR
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The look like Champions.

ugh!

Better off sticking with recommended NGK or ND.
1980 kz750E1, Delkevic exhaust

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Last edit: by JR.

Spark plug problems 18 Aug 2021 08:36 #854014

  • Pichu1214
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Hello, they are champions N11, is the best i can find here.

I have poor smooke sometimes 
 

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Spark plug problems 18 Aug 2021 10:58 #854023

  • JR
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Champion plugs seem fine in a car but I always found them pretty poor  in any motorcycle. Not saying they are the cause of you problem but lets see what others have to say.
I dont know what ngk plugs are recommended for the kz1000 so cant say what the Champion equiv would be.

do you have a multimeter to check power to the coils? With ignition on and meter on DC volts put red probe on red wire at the coil an black probe to earth  ie  motor or frame.
Voltage should be close to or just s bit lower than that of the battery

 
1980 kz750E1, Delkevic exhaust

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Last edit: by JR.

Spark plug problems 18 Aug 2021 11:50 #854029

  • TexasKZ
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What brand and model are the carburetors? What jets are in them? Have you checked the fuel level in each carburetor?
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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Spark plug problems 18 Aug 2021 15:06 #854035

  • SWest
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I fixed your pics. Click insert all next time. Could be old valve guide seals. 
Steve
Z1b1000 1975 Z1b
Opinions expressed by me do not reflect those of the the staff or members
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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Spark plug problems 18 Aug 2021 16:26 #854038

  • Mikaw
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What am I missing here. The first two photos show 4 plugs that that look very rich but none have the electrode and the earth strap bridged. Then in photos 3&4 you show a plug that is nothing like the first four. In forty plus years of being a backyard mechanic I have never seen a plug with the electrode bridged to the earth strap, let alone have that happen in a “couple of short rides”. Please show us the most recent set of plug and there condition. 

NGK B8ES is the factory recommended plugs. Or Nippon Denso W24ES-U

Did you talk with Murray’s about your bike to get the jetting correct before purchase?
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
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Last edit: by Mikaw.

Spark plug problems 19 Aug 2021 06:16 #854053

  • slmjim+Z1BEBE
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N11's are pretty hot.  Carbon soot that heavy after "a couple of short rides" point to jetting.  Also, confirm full battery voltage to the coil primaries per JR's suggestion.

Good Ridin'
slmjim & Z1BEBE
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A Rider looks at your odometer and tags.

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1974 Z1-A x2
1975 Z1-B x2
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Spark plug problems 17 Jun 2022 13:13 #868992

  • d4rkmatter
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Had the same thing happen when I switched to Murray Carb setup.

I called him and he told me the carbs run rich at idle and will improve with RPM.

So far this hasn't been true. But I haven't had the bike up past 40 MPH so... maybe?


Still have the stock carbs?

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Spark plug problems 17 Jun 2022 14:14 #868994

  • Street Fighter LTD
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Think outside the box on jetting 
Age and condition of valve guide seals  (remember Smoking  stated )
I experienced this condition 
Dave

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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Last edit: by Street Fighter LTD.
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