http://www.scootertime.net/viewtopic.php?f=39&t=954
Yamaha Razz Service Manual (found through Google and another WikiAnswer question) http://www.mediafire.com/?xibwfty2mtj Also available at http://scootertime.net .
Here's a link for the Razz repair manual-http://www.mediafire.com/?xibwfty2mtj
Try replacing your current 2 stroke oil with 100 percent synthetic 2 stroke oil. Available at any motorsports dealer. Worked for my Razz. Has not smoked since.
If gas is leaking from a Yamaha Razz muffler, then the float may not be set correctly. This means that it is not shutting the intake off.
2 places
.039-.043
On a 1994 Yamaha Razz scooter, the governor is typically located within the carburetor or throttle assembly. It's designed to limit the maximum speed of the scooter for safety and compliance with regulations. To access it, you may need to remove the carburetor or throttle housing. Always refer to the owner's manual for specific details and instructions on adjusting or removing the governor.
There are several reasons why a Yamaha Razz may quit running. These include issues with the engine, its age, issues with spark plugs, lack of gravity, lack of oil, lack of gas, etc.
For the Yamaha Razz, it's recommended to use a high-quality gear oil, typically a 75W-90 or 80W-90, depending on the climate and riding conditions. Always refer to the owner's manual for specific oil specifications and capacities to ensure optimal performance. It's important to use oils that meet the manufacturer's standards for best results.
Does it run on choke? Is it starving for fuel, if so is the needle valve set for the float?
Bad needle/seat valve on carb.?
10th digit of VIN is always model year; use common sense to determine decade.