Outboard 2 Stroke or 4 Stroke?

Question

I just bought a used Yamaha Motor. The guy i bought it from didnt know much about it, i'm guessing it is a 6 or so HP, with an internal gas tank. My question is would it be a 2 or 4 stroke motor? I dont know to just put gas in the motor ota mixture of gas and oil.

I can not find a model or sereal number anywhere on the motor. I was able to find "Y-2 6E0-01" on the block.

Can anyone tell me how i can tell if it is a 2 or 4 stroke motor?

Answer 1

Take the engine cover off and look for an oil level dipstick.  If the Yamaha is equiped with a dipstick it is a 4 stroke with oil in the crankcase.  If not, it is a two cycle and you will need to mix your fuel.

Answer 2

Look for an oil dipstick and an oil drain plug on the powerhead. If you can't find either of these, it's a 2 stroke.  Here's a link to a site that may be of future help.:

http://www.marineengine.com/mfr/yamaha_o...

Good luck!

Answer 3

Look around the spark plugs, if there are removable caps to adjust the valve clearances, it is a four stroke.  If the area around the spark plugs is solid with no openings, it is a two stroke.  You may have to remove a portion of the engine cowling to do this.