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2010 ktm 300xc detonation

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i know this is'nt a thumper ,this is my first 2-st in 10years and im kinda rusty on jetting, i live in central alabama,alt is aprox 450 ft,temp is 50-70 ,it detonates on de-cel and acts lean on bottom to mid which is weird because it does'nt want to stay "cleared out",i have it jetted to the books chart with little to no change.Any help would be great:foul:

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what fuel to do use

my yz 250f was meant to ping if i use standard unleaded so i have to use premium unleaded

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