Look for stickers labeling the equipment (e.g., “Four Cycle” or “No Fuel Mixing”).Here are some easy ways to tell if your engine is two-cycle or four-cycle: How do I know if my boat motor is 2 or 4 stroke? If the VIN number starts with 4X4 your PW-50 is between 1981-1983 and more research will be needed. The VIN number on a PW-50 can be found on the frame’s down tube. Therefore knowing what year PW you have can be difficult unless you know how to read the VIN number or have a title in hand. How do I find out the year of my Yamaha pw50? Under the seat where the floor board meets the motor compartment.There serial number on your Yamaha Golf Cart can be located in one of three places: In 1984, it launched production of a 232 cc engine with 9.9 horsepower, the F9. Yamaha first began work on developing 4-stroke outboard motors in 1980. When did the Yamaha 4-stroke outboard come out? Yamaha Outboard Motor MODEL, PRE-FIX and SERIAL NUMBER’S are stamped on a metal plate which is mounted on the transom clamp bracket located at the rear of the boat. Where is the serial number on a Yamaha outboard motor? This manufacturer’s tag also shows the year the motor was built, or the model year on all motors except Honda. Go to the motor and look on the motor’s swivel bracket for an embossed, metalized tag or plate that has the name of the motor’s manufacturer boldly stamped at its top. The number denotes the outboard’s HP, and the last letter denotes the outboard’s year of manufacture. The number at the top right is the Yamaha model number and year. How do I tell what year my Yamaha outboard is?

Reading yamaha outboard serial numbers