Ok, my 26hp garden tractor has these zerk fittings easily seen and I shoot grease into them yearly
Front spindle:
Blade bearings:
There's zero - nada - none on my 150cc Tao Tao go kart:
Front spindle none:
Steering control arms
Wheel bearings sealed
Upper and lower suspensipon arms just bushings to frame, so nothing to lubricate there
Rear axle no zerk fitting anywhere
Again, There's zero - nada - no zerk fittings on my 150cc Tao Tao go kart, so this is normal for chinese go karts? Or not needed in this class of vehicle usage? ie, not expected to get sunk under water, etc.