spark plug foult

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jonbongai
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spark plug foult

#1 Unread post by jonbongai »

HI, I have a Yamaha 1998 250 yz
ever 1hour I have to chance spark plug
I treid everthing
plaese can you help me
Last edited by jonbongai on Tue Apr 10, 2007 2:34 pm, edited 1 time in total.
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Johnj
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#2 Unread post by Johnj »

Uhh...maybe you need new rings.
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flynrider
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#3 Unread post by flynrider »

What is fouling the plug or plugs? Oil? Gas? Carbon?
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fireguzzi
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#4 Unread post by fireguzzi »

Are you riding the dodo out of it? or are you just putting around slowly?
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#5 Unread post by XJ1100 »

Since this bike is a 2-stroke...

It could be that you aren't running it hard enough to burn off carbon, most likely this is not the case.

Check to make sure the engine is not getting too much oil..

Check carburetor settings...(make sure it is not running too rich)

If they are all correct then check to see if your trans. oil level is slowly dropping. What could be happening is the trans. oil is leaking into your crankcase and causing the plug to carbon up and foul out. (Which would require a seal replacement)
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Sev
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#6 Unread post by Sev »

Are you using the right sparkplug?
Of course I'm generalizing from a single example here, but everyone does that. At least I do.

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#7 Unread post by BuzZz »

All of the above, 'cept the worn rings maybe, plus... Is the air filter dirty?

Change you pre-mix oil or mix ratio when this started?
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