Ive recently put together 2 motorized 66cc bikes, 1 for me, 1 for the gf. Theyre both chinese kits, and so far we've been running semi synthetic oil at 16:1 mix cause new engine break in. However, this is expensive at $10 a quart, even once i lean out the mixture. Im curious if i can get away using outboard motor oil, as its $13.34 a gallon at wal mart. I recognize that outboard engines are water cooled and run at lower temperatures than air cooled 2 strokes. Would a TC W3 oil, then, be too thin for air cooled engine?