Wait till 1,000 miles to switch to T6. Go ahead and do an oil change and use the T4 again. The general recommendation for the CG250 engines is to wait to switch to synthetic until after 1,000 miles. If you ride your Hawk at a generally higher RPM range, I'd recommend changing your oil every 500 miles as this thing doesn't have a true oil filter and only takes 1 quart of oil per oil change.
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