if it is jetted too lean it will overheat, but you can normally hear that in the idle revving a bit high so if it isn't boiling under easy circumstances then i agree with f5
Never done anything fancy with a sparkplug change and using the general purpose ES plug it will most likely have even less effect than if you were using the recommended racing plug EG (i think)
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2003 txt250 Pro
2013 Ossa 280i
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