Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to replace a piston ring on a dirtbike [title] Drain your antifreeze and remove the gas tank from the dirt bike. [step] Remove the seat also. [title] Unscrew the muffler and take off the springs with a tusk or whatever you may prefer.

Ending1: [title] Begin moving the wires that are in the way of the engine. [step] Remove the spark plug and the top engine block on the dirt bike. Ending2: [step] Be careful and don't use any oil, as because you'll be replacing your piston ring you don't want anything to get in the way of whatever fuel pump you have. [title] Insert the piston into the engine and in turn add oil to the muffler and replace it with the proper fuel. Ending3: [title] Use a farm fork or an overhand fork to remove the car jack heads and the spare drive discs (the small bunch in between them), you cannot spare axles so have an overhand fork. [step] You might get a bigger deal if you just stock up on field gear once in a while to avoid a full blown fire. Ending4: [title] Set your master cylinder to the low rated rpm (rmax) setting for gentle movement. [step] This means not pressure too high, as you don't want it to kill off the engine.

Answer format: ending1/ending2/ending3/ending4