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Realizing this thread is old.... My question is why doesn’t stock ECU program adjust fuel amount automatically when O2 sensor detects lean, after aftermarke parts are added? I understand the ratio are still optimized for emission (say 97% combustion)not max power (say 85% combustion), but it...

Yup. Should have read through here first. Never thought about it after drilling many a Japanese plugs. Drilled straight through into the KTM plug. More #@%&$#!