Plug condition

gordone
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28 Jun 2021 23:15 #850870 by gordone

Plug condition was created by gordone

What do you say about the plug condition?

Cylinder 1:

Cylinder 2:

Cylinder 3:

Cylinder 4:

1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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zed1015
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28 Jun 2021 23:43 #850871 by zed1015

Replied by zed1015 on topic Plug condition

Looks to be running ok, plug heat range is good with the colour change on the bend of the earth strap.
The base ring (which is fuel ratio) on number 1 looks shiny and may be a little oily unless it's the pic, the rest with a full turn of light soot are ok.
Unless you did a high speed plug chop that only indicates the running conditions at idle.

AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-

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gordone
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29 Jun 2021 09:58 #850882 by gordone

Replied by gordone on topic Plug condition

Thank you,

yes I stopped the engine normal when parking.

Will do a high speed plug chop test later these summer, do I need to clean the plug or replace them before the test?

after installing your air jet the chooke come more into play also

1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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zed1015
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29 Jun 2021 13:08 #850892 by zed1015

Replied by zed1015 on topic Plug condition

No!
No need to clean or replace them .
Whatever speed and rpms you kill the motor at, the plugs will show the mixture and running conditions at that rev range.

AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-

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Mikaw
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29 Jun 2021 13:28 #850894 by Mikaw

Replied by Mikaw on topic Plug condition

Beyond what Zed says. I’ve bought new plugs, started the bike and warmed up with old plugs, shut down and installed new plugs. Then out for the plug chop runs. Plugs are easy to change on the road side. You can read your chops and install the old plugs for the run home. It preserves the chop image.

www.dragstuff.com/techarticles/how-to-read-plugs.html

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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loudhvx
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29 Jun 2021 14:40 - 29 Jun 2021 14:40 #850905 by loudhvx

Replied by loudhvx on topic Plug condition

They look good to me. And I agree with Zed. Just put them back in and run it.

1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.

Last edit: 29 Jun 2021 14:40 by loudhvx.

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gordone
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30 Jun 2021 13:31 #850974 by gordone

Replied by gordone on topic Plug condition

Thank you all

1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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Plug condition

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