Spark plugs

Andyp62
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31 May 2022 06:41 #867935 by Andyp62

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Hi all
With much help on here from you guys I got my 1978 z650 running ok, the only thing is it seems to be going through spark plugs like it thinks it’s a H2, it is a US import 650, 1978 with new coils and 5 ohm ngk suppressor caps and a new Boyer bransden micro digital system, the current plugs are ngk B8ES.
thanks

1978 Z650 B2, US import to the UK

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TexasKZ
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31 May 2022 07:44 #867939 by TexasKZ

Replied by TexasKZ on topic Spark plugs

What is going on with the plugs? Are the electrodes melting? Oil fouled? Fuel fouled?

1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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Warren3200gt
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31 May 2022 07:50 #867942 by Warren3200gt

Replied by Warren3200gt on topic Spark plugs

In addition to TexasKZ's questions your using too cold plugs. You should be using b7es or better still denso w22es.
Kawasaki revised 650 recommended plugs from b8 to b7 as on road testing b8's were found to be too cool and kept fouling. (sound familiar?).

Z1000J2 somewhat modified!

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650ed
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31 May 2022 13:56 #867953 by 650ed

Replied by 650ed on topic Spark plugs

Yes, try using ND W22ES-U plugs and I suspect the problem will be gone. Ed

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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Andyp62
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01 Jun 2022 06:54 #867974 by Andyp62

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They are a little bit on the rich side but not excessively

1978 Z650 B2, US import to the UK

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Andyp62
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01 Jun 2022 06:59 #867975 by Andyp62

Replied by Andyp62 on topic Spark plugs

Thanks for the info I will try them and see how it goes

1978 Z650 B2, US import to the UK

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linuxrob
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01 Jun 2022 19:29 #868013 by linuxrob

Replied by linuxrob on topic Spark plugs

Post a pic of the plugs please, and also check the coil voltage, with the electronic ign it will need all the volts it can get. mine was loosing 1.8V by the time it went through all the wires so ran the coils from big wires via a relay. Mod on here

Keep us informed

rob b
NE UK

1980 Z500 B2 owned from new 78260 miles
1980 Z500 B2 in bits since 1982 23000 miles
2004 GSF1200S Bandit K4
2000 GS125 ESD

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Andyp62
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04 Jun 2022 22:09 #868259 by Andyp62

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I will take a picture of the plugs in morning

1978 Z650 B2, US import to the UK

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Andyp62
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07 Jun 2022 06:12 #868405 by Andyp62

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This is number one and four plugs just waiting for the ND plugs to arrive

1978 Z650 B2, US import to the UK

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Andyp62
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07 Jun 2022 06:13 #868406 by Andyp62

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Number four

1978 Z650 B2, US import to the UK

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TexasKZ
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07 Jun 2022 07:15 #868407 by TexasKZ

Replied by TexasKZ on topic Spark plugs

If those plugs are dry, then the correct heat range may help. That could also be the result of weak spark or a very rich mixture.
If they are wet, then I would suspect valve stem seals, or some other oil-related problem.

1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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Mikaw
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07 Jun 2022 09:10 #868417 by Mikaw

Replied by Mikaw on topic Spark plugs

piketransit.com/carbon-fouled-spark-plug/

piketransit.com/oil-fouled-spark-plug/

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
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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