No spark on a TM125????

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Beemer man

Race Dog
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Apr 12, 2006
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BMW R1200GS
Here's one for the technical Boffs, Yesterday a friend of mine was riding his TM125 when it just died, when trying to trouble shoot the problem, he removed the spark plug to check spark, when earthed against the motor there is no spark, when you take the plug away from the earth it sparks, what do you think the problem is? I am suggesting the spark plug is at fault. What do the experts say. ???
 
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