I recently picked up an 07 Yamaha 2.5 4 stroke in a pawn shop for a song. I tested it as best as I could bolted to a dumpster outside with no water source. The engine started and I imediately turned it off since there was no water to cool (I know bad idea but need to make sure it would run). Today I put oil in it and made a home rigged motor stand and used a bucket for water. The engine started after the 1st pull and shifted seems to be running perfectly fine for a $250 pawn shop motor. However there seemed to be a lot of smoke. I know with a 2 stroke extra smoke typically meant you put to much oil in however this is my first 4 stroke and really my first engine. Should I be concerned about the smoke? Or will it kind of burn off so to speak after running a bit like my dad's old Johnson 48 Special?