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This is my 1998 Yamaha YZ125 that I've purchased 2 month back and it's now been sitting in my storage room for the past 2 weeks. This bike has problems with the spark plug because every time I change a new plug it keeps blacking out. I've changed new plug coil, new coils, new magnet and just professionally tuned the carburettor. I've not changed the CDI yet. Any help would be much appreciated thanks.
 

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Your are running far too rich or you have an oil leak from the gearbox. How long do you run it before it blackens up ?
Check the choke is closing when off.

Sometimes you can 'restore' a plug with one of those small butane pencil torches. Burn off the carbon.
 
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