there is a little screw on the back of the carb. if you loosen it, it will idle slower, tighten it, it will idle faster.
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.
Bad needle/seat valve on carb.?
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
It can go upto 45km per hour depending on weight and weather, which is about 72 Km an hour.
Here's a link for the Razz repair manual-http://www.mediafire.com/?xibwfty2mtj
Yamaha Razz Service Manual (found through Google and another WikiAnswer question) http://www.mediafire.com/?xibwfty2mtj Also available at http://scootertime.net .
.039-.043
If your Yamaha Razz runs only on choke but dies when the choke is off, it likely indicates a problem with the fuel mixture or the carburetor. When the choke is engaged, it enriches the fuel-air mix, compensating for a lean condition caused by issues such as clogged jets, dirty air filters, or vacuum leaks. Cleaning the carburetor and ensuring proper air and fuel flow should help resolve the issue. Additionally, checking for any blockages in the fuel line can also be beneficial.
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.
http://www.scootertime.net/viewtopic.php?f=39&t=954