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Old 04-11-2006, 08:28 AM   #1 (permalink)
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Hi all!

I've realized that the stock spark plug for the DRZ400S o SM bike is the NGK CR8E, instead of the CR7E that is the Z400's stocker (hotter than the CR8E).

If it's true, do you think it would be necessary replacing our spark plug with a CR8E model?

Added to this, do you think it's a good practise using a CR7E spark plug in winter and a CR8E one in summer?

Thanks.
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Old 04-11-2006, 11:13 AM   #2 (permalink)
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The dirt bike or SM bike uses a colder plug, yes colder (NGK CR8E) because of their higher compression (12.2:1). It's common practice to run a colder plug w/ higher compression engines.
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Old 04-11-2006, 12:02 PM   #3 (permalink)
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ok, I thought that the DRZ-S and DRZ-SM have the same compression than the Z.

Edited: I've just read that the S and SM model has 11,3:1, the same than Z400. The E model has 12,2:1.

So that, why the S and SM model need a colder plug? Should we use these colder spark plugs?
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2004 Z400.
Exhaust: Pulse Charger (Stealth Charger version mounted).
Carb: Sparks FCR39.
Jetting: 158 main jet, 55 pilot jet, 1 1/2 turns out, needle on 3rd groove.
Intake: Pro Design Foam Pro-Flow kit, No lid, No snorkel, Outerwears lid cover, 4 extra airbox vents.
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Old 04-13-2006, 06:43 PM   #4 (permalink)
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I have a 13.5:1 440 big bore, and I almost had some serious problems because I was still using the stock plug. I went to the CR8E, and all is fine now.
I had some serious detonation going on.

Wile investigating this I learned a trick from a reliable source.

NGK has a coating on the threads of their spark plugs wich helps you determine proper spark plug heat.

The base of the plug should dis color 3 threads up.
If it goes farther then its too hot.
If its less then its too cold
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Old 04-21-2014, 04:04 PM   #5 (permalink)
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Old 04-22-2014, 01:16 AM   #6 (permalink)
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Quote:
Originally Posted by CFM-Z440 View Post
I have a 13.5:1 440 big bore, and I almost had some serious problems because I was still using the stock plug. I went to the CR8E, and all is fine now.
I had some serious detonation going on.

Wile investigating this I learned a trick from a reliable source.

NGK has a coating on the threads of their spark plugs wich helps you determine proper spark plug heat.

The base of the plug should dis color 3 threads up.
If it goes farther then its too hot.
If its less then its too cold
That's the incorrect way to read plug heat. It is read by the strap not the threads.
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Old 04-22-2014, 08:31 AM   #7 (permalink)
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Quote:
Originally Posted by djise View Post
Hi all!

I've realized that the stock spark plug for the DRZ400S o SM bike is the NGK CR8E, instead of the CR7E that is the Z400's stocker (hotter than the CR8E).

If it's true, do you think it would be necessary replacing our spark plug with a CR8E model?

Added to this, do you think it's a good practise using a CR7E spark plug in winter and a CR8E one in summer?

Thanks.
No need to change from the stock CR7E plug on your engine. Going colder when un needed will foul the plug.

The outside temp getting hotter will actually make combustion chamber temps colder due to less o2 in the air making the mix rich and cooling faster.
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