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  #1  
Old 06-09-2007, 07:35 PM
Shoei_391's Avatar
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Default Cleaning Spark Plug

     

I fouled a plug (Relized I was riding my YZ like a 4 stroke because I was afraid of the power band ) What can I use to get the oil and everything off of it?
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Old 06-09-2007, 09:41 PM
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Default Re: Cleaning Spark Plug

I have a 4 stroke, but whenever my buddy fowls his we use starter fluid and a wire brush.
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Old 06-10-2007, 07:59 PM
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Default Re: Cleaning Spark Plug

pj1 makes a electrical contact cleaner that I used when I had my kx100 and it cleaned my plugs up really good. You might also want to try and get a hotter plug, while your still getting used to the kick of the powerband, just dont run it wide open for a long time with that plug.
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Old 06-10-2007, 08:55 PM
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Default Re: Cleaning Spark Plug

Good idea, thanks man. How do I know which plugs are hotter than others?
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Old 06-10-2007, 08:58 PM
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Usflag Re: Cleaning Spark Plug

The lower the number the warmer the plug, eg. a BR8EG is cooler thatn a BR7EG in the NGK plug nomenclature. Just curious, as cheap as a standard NGK or ND plug is why not buy a four pack and have some handy?

Bill
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Old 06-10-2007, 09:01 PM
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Default Re: Cleaning Spark Plug

Oh well I looked at my manual and my dad ordered the suggested plug, and they only came in 10 packs. I really should get a hotter plug until I get really get good enough to be in the power band most of the time.
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Old 06-10-2007, 09:14 PM
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Usflag Re: Cleaning Spark Plug

Check Rocky Mountain ATV/MC or even an auto parts store. We have gotten them at Advanced Auto Parts.

Bill
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Old 06-10-2007, 09:16 PM
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Default Re: Cleaning Spark Plug

Thanks!!
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Old 06-10-2007, 09:41 PM
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Default Re: Cleaning Spark Plug

Ok this is a really stupid question, but do you consider a plug fouled when it is coated with oil to the point as to where the bike wont start? Or is it when you pull out your plug and it is black. Mine is black...but my bike still starts.
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Old 06-10-2007, 09:58 PM
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Default Re: Cleaning Spark Plug

If your plug is black and still running, sounds like you need to work on the jetting a bit. It could be a bit rich. Although from what I've read, that's an indication of how the bike was most running very recently. If you want a better indicator of jetting, you can take an old plug and cut away at the threads so that you can see the insulator tip. You're looking for a tan/brownish color (highly technical terms here). Black indicates a rich condition and a light tan or white indicates lean. I believe anyway. I could be totally wrong here.

If your bike won't start, you pull the plug and it's black and wet, I'd consider it fouled then.
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Old 06-10-2007, 10:11 PM
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Default Re: Cleaning Spark Plug

Well I think I am at fault. I was kind of lugging it around like a 4 stroke before today
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Old 06-10-2007, 10:15 PM
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Default Re: Cleaning Spark Plug

Try doing a search for "plug chop". It might help if you're wanting to get an idea where you're at on your jetting.
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Old 06-11-2007, 07:22 AM
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Default Re: Cleaning Spark Plug

Quote:
Originally Posted by Florida 393 View Post
The lower the number the warmer the plug, eg. a BR8EG is cooler thatn a BR7EG in the NGK plug nomenclature.
Bill
How does the heat range change of the plug affect the bike? Over the weekend I was out riding and playing with jetting and I fouled a plug when to rich. I adjusted back to a good mix and then a fellow rider was kind enough to give me a new plug. It was one number lower than mine. I believe my stock plug is BR9EG and he gave me a BR8EG. It seemed to work just fine the whole day, but I'm curious on effects if any?
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Old 06-11-2007, 07:36 AM
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Usflag Re: Cleaning Spark Plug

Without getting technical it burned off the richer mixture due to the hotter spark. This is a stop gap fix for proper jetting. The only place I have heard of a legitimate need for a cooler/hotter plug was in the desert races where the sustained high speed runs justified a cooler plug. I am sure there are engineers that can give us long explanations and show us charts on using different heat range plugs.

Use the different heat range plugs if it works for you, I am one of those dreaded engineers and my personal research says use the recommended plug for normal running (racing for me) conditions. Just my addled opinion.

Bill
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Old 06-11-2007, 10:20 AM
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Default Re: Cleaning Spark Plug

yep I think Bill has got it all covered there. I only use two different plugs, a br8es and a br9es. I use the 8 when I go trail riding since im not at full throttle all the time, and I use the 9 when I'm racing, or at the track.
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