wouldnīt say it matter what tuning you have, 2% is always enough, and canīt say 3% is too much for stock engine, it should get the same amount of oil compared to the amount of gas as a 70cc
the only thing when using the stock oil pump and 70cc is that the oil pump is tuned after the stock jets, so when getting a bigger carb it will get less oil compared to the amount of gas
I always used 3% just to be safe
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