open throttle

It should be regulated with full open throttle to maintain an oil level in the glass, approximately half way.

If your engine does not start with an open throttle, look to see if the governor stem has not been screwed down tight.

She flung herself from the tree in haste, got the machine out of the barn and started down the road with wide-open throttle.

But Terry was sending her plane forward with wide open throttle.

I have known an open throttle and late spark to cause backfiring.