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red deposit on a spark plug

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theshmoo
Bottomless Pit



Joined: 23 Jun 2004
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PostPosted: 08:38 - 11 May 2006    Post subject: red deposit on a spark plug Reply with quote
What causes this to happen ?
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Jamie.
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Joined: 27 Dec 2005
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PostPosted: 08:39 - 11 May 2006    Post subject: Reply with quote
Have you got a picture? It should be a red/brown (ish) colour
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Finglonga
World Chat Champion



Joined: 27 Jul 2004
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PostPosted: 08:48 - 11 May 2006    Post subject: Reply with quote
Blood When you removed it? Mr. Green

As above a pic would be helpfull ......as red?!?!
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theshmoo
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Joined: 23 Jun 2004
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PostPosted: 10:42 - 11 May 2006    Post subject: Reply with quote
WQill get a pic for you its very red not brownish/red
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Marci
Brolly Dolly



Joined: 01 Sep 2005
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PostPosted: 14:39 - 11 May 2006    Post subject: Reply with quote
Attempting to run the bike on Red Diesel, or sticking WAY too much Redex in a nearly-empty tank could also possibly result in the above - both incredibly idiotic things to do mind...
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theshmoo
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PostPosted: 14:54 - 11 May 2006    Post subject: Reply with quote
The bike has 4 carbs all but the one with the redish spark plug are firing well. all have good voltage going to the plugs and i fitted new plugs to. if the carb was running lean what colour would the plug be ?
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Marci
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PostPosted: 15:07 - 11 May 2006    Post subject: Reply with quote
https://www.verrill.com/moto/sellingguide/sparkplugs/plugcolorchart.htm

Google's a wonderful tool ( https://www.google.co.uk/search?q=spark+plug+color&start=0&ie=utf-8&oe=utf-8&client=firefox-a&rls=org.mozilla:en-US:official )
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 15:07 - 11 May 2006    Post subject: Reply with quote
theshmoo wrote:
The bike has 4 carbs all but the one with the redish spark plug are firing well. all have good voltage going to the plugs and i fitted new plugs to. if the carb was running lean what colour would the plug be ?


If it was running lean, there would be a powdery white deposit.

If it was running VERY lean there would be scorching over the ceramic part and the electrode would be all burned away like insects had been eating at it (if this is the case, it is probably doing exactly the same to the piston crown which will eventually lead to what is technically known as 'a hole'). Running very lean, dinnae ride it 'till it is sorted.

I have no idea what would cause a red deposit on a plug. Rust? Redex? Hermatite?!
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Marci
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PostPosted: 11:57 - 12 May 2006    Post subject: Reply with quote
Quote:
Rust?


Indeed - if it's been run out of fuel (petrol tank), then it'll have pulled a lot of rust flakes etc thru from bottom of fuel tank... take it you have a decent fuel filter inline on yer fuel line?
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woodyfjr
Scooby Slapper



Joined: 25 Jan 2006
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PostPosted: 12:35 - 12 May 2006    Post subject: Reply with quote
Red? are you colour blind just a thought Wink
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veeeffarr
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Joined: 22 Jul 2004
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PostPosted: 12:40 - 12 May 2006    Post subject: ? Reply with quote
What time of the month is it?
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Jamie.
World Chat Champion



Joined: 27 Dec 2005
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PostPosted: 12:57 - 12 May 2006    Post subject: Reply with quote
12th
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veeeffarr
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PostPosted: 13:57 - 12 May 2006    Post subject: Reply with quote
Rolling Eyes
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SilvaRizla
Spanner Monkey



Joined: 30 Apr 2006
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PostPosted: 19:20 - 12 May 2006    Post subject: Reply with quote
It means your plug is knackered, its usually down to wear on the plug but this seems strange if the others are ok. Where they all brand new and put in at the same time?

You need to replace it anyway, it won't fire properly because the deposits are stopping the spark
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theshmoo
Bottomless Pit



Joined: 23 Jun 2004
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PostPosted: 20:02 - 13 May 2006    Post subject: Reply with quote
Marci wrote:
Quote:
Rust?


Indeed - if it's been run out of fuel (petrol tank), then it'll have pulled a lot of rust flakes etc thru from bottom of fuel tank... take it you have a decent fuel filter inline on yer fuel line?


Turns out there was allot off rust in the bottom off the carbs from the tank making the fuel go reddish and blocking the jets on that cylinder.


thanks for all your help guys. Thumbs Up
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Finglonga
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PostPosted: 20:35 - 13 May 2006    Post subject: Reply with quote
-Jamie- wrote:
12th


Mr. Green Mr. Green Class!! Mr. Green Mr. Green
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Old Thread Alert!

The last post was made 19 years, 290 days ago. Instead of replying here, would creating a new thread be more useful?
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