Spark plug oil?

  • gordone
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Spark plug oil?

08 Mar 2020 03:09
#820535
Is these oil?



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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  • Nessism
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Re: Spark plug oil?

08 Mar 2020 06:09
#820537
Looks more like rich carburation.
Is the engine consuming oil? How many mpg do you get when ridding?
Ed
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0

www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know

1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread

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Re: Spark plug oil?

08 Mar 2020 07:31
#820540
Nessism wrote: Looks more like rich carburation.
Is the engine consuming oil? How many mpg do you get when ridding?

Thank you.

Its a friend of mine, will ask him.

He says he need to replace spark plug all the time because the sylinder 2 stop firinc because of these.
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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Re: Spark plug oil?

08 Mar 2020 08:47 - 08 Mar 2020 08:51
#820544
Could be oil fouling from a faulty valve guide seal.
The usual symptom is the plug fouling when the bike has been stood overnight which allows enough time for oil to seep into the cylinder.
Once a fresh or cleaned plug is fitted and the bike started the oil in the cyl is burned off and is usually ok for the rest of the day until left to stand again.
Smoke from the exhaust on acceleration after deceleration (which creates a momentary partial vacuum in the cylinder and draws oil down the guide and then burns it ) would back this up.
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Last edit: 08 Mar 2020 08:51 by zed1015.

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Re: Spark plug oil?

08 Mar 2020 09:28
#820547
zed1015 wrote: Could be oil fouling from a faulty valve guide seal.
The usual symptom is the plug fouling when the bike has been stood overnight which allows enough time for oil to seep into the cylinder.
Once a fresh or cleaned plug is fitted and the bike started the oil in the cyl is burned off and is usually ok for the rest of the day until left to stand again.
Smoke from the exhaust on acceleration after deceleration (which creates a momentary partial vacuum in the cylinder and draws oil down the guide and then burns it ) would back this up.

These is exatct symtoms he has experience!
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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Re: Spark plug oil?

08 Mar 2020 13:36
#820559
He have not control over the oil consumtion...

He plan todo a compression test to compare the cylinders, if the are close to identical his planis to replace the valve seal...
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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