It sounds like the governor linkage is frozen, jammed, or out of adjustment. Locate the throttle shaft on the carburetor body, start it up, and put the engine under load. As it dies, you should see the governor link open the throttle completely up, to compensate for the lower engine speed. If it does appear to operate correctly, the problem will be carb related, probably a blocked main jet or air bleed, and should be cleaned and rebuilt.
Depends on gearing and weight, but they will run around 3600 rpm, if that helps you.
Depending on the model, 3600 - 4000 rpm top no load speed.
Top no-load speed is 3050 rpm.
120 full throttle
about 80+ sixth gear full throttle
62MPH
there should be a screw in the side of the carbuerator. turn the screw all the way in be careful not to bottom it out tight you will ruin the needle valve. then turn the screw opposite 1 1/4 times this should be good slow idle and also fast idle speed.
Go into options/frame skip/throttle and you can modify how fast the GBA runs
faster i did a test with no upgrades and no throttle bolts
The position of the throttle(gas pedal) decides how fast the engine can turn, and the selection of gear decides how fast the wheels can turn. And how fast the wheels can turn decides how fast the car will be going. (note that this is quite simplified. Eventually the resistance of pushing the car forward will be higher than the engine can overcome, and then you won't get any more turns out of the engine, even if you try for more throttle)
I have a crf150 and it has almost reached 70MPH but i didnt have the throttle all the way in.
To get to his igloo you have to click on a member penguin with their igloo opened and click on rockhopper until his igloo is opened you got to do it fast