Why does my razor bistro wheels only turn when i pick it up off the ground

I don't think this would be a problem, as long as the wheels fit the axle properly, both in diameter, and length of shaft.

This can be caused by several things;
If it used to be good but is now faulty it is most likely that it just needs cleaning. If you are using beans that are 'oily' they can clog the grinder, you should anyway disassemble it and clean every year. Do not use soap and water, just brush it with a stiff brush (e.g. the stiffest type of toothbrush) and a vacuum cleaner.
There is also a possibility that something has got into the grinder along with the coffee beans that has damaged the grinding wheels; in that case you need to replace the wheels.

Have you tried removing plastic chain guard and making sure chain is not off track i had this problem and that is all it was.

get a rancher take pices out an make sure ur put it were the scurrs at an tire ur be rock an roll driveing

try jumpering the battery directly to the motor and see if that works, first

i had the same problem with mine and it ended up being that one of the batteries was bad, there are two 12v batteries wired in series under the seat, usually you can tell which one is bad by looking at them, one of the batteries will be swelled up

Signs of the Razor Bistro battery needs replacing.

Make sure the battery is full, if not, add distilled water to full mark. Clean the battery terminals and make sure they are tight. The folks at Auto-Zone will test the battery for free.

Carb needs cleaning or replaced

replace thumb tab throttle. part is $12.99 from razor. go to razor site to order. i had the same problem after my daughter drove it over a bumpy sidewalk.