Engine blown up
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The engine could well still be running lean aswell. But if lean was the only cause you'd normally get a 4 point heat seizure of the piston before it melted the piston in a 2 stroke atleast. Like what's been said
High compression
Lean mixture
Low ron fuel
Wrong heat rating plug
Carbon build up
Too advanced ignition timing
can all cause detonation.
Your engine failure could be down to any number of the above causes. -
Yeah, I did think it could be lean as well. One things usually exasperated by another. I just thought it best to start with a known ‘symptom’ and taking it from there. All you can really do is rebuild and keep a good eye on the plug for other symptoms. The only way I know to check for air leaks needs the engine to be running. Carefully spray suspect areas with carb cleaner and see if the revs settle down/alter...
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@SpookDog meant to quote Declan there pal.
With the athena kit it's a complete unknown quantity. Only issue I've experienced with running a colder plug ( a10 range on nsr125) was it would foul and cause a missfire when the weather turned cooler.