My z4200 toro wont start seliod just chatters

If you were able to jump start mower then the problem lies with the battery connections or battery itself

be sure pto is off, park brake is on, and control arms are out. If it wont start check that the click is not coming from the start solenoid. If the start solenoid is clicking it either has a low battery, bad ground at solenoid or solenoid needs to be replaced.

Your throttle csble is stretched it needs a new one

sorry to say your pump has gone out or there no fluid in it ether way your going buy a new pump

Check your fluid..... Sounds low...

there is only one way gas can get into the oil. if someone is pouring it into the crankcase...good luck

You may have some bent or out of adjustment linkages, causing the brakes to stay on.
Or the friction nut (one on each transmission) is too tight. These are located just in front of the axel, they go through a slot, the washer behind the nut should turn freely

First check to see if there is a fuel shutoff under the tank. On some models there is a fuel filter screen inside the tank where the fuel line connects to the tank. If niether of these work, R&R the carb.

Had same uneven mowing problem with new Toro Z4200 XTR mower. Problem was one side of the U-shaped rear deck hanger rod had popped out of its chassis mount (did hit something with mowing deck). Removed hanger chassis mount & its bolt. Put end of U-shaped rear deck hanger rod back in the chassis mount and remounted hanger chassis mount & its bolt. Z4200 now cuts lawn evenly again.