This page of our guide to Death Stranding explains how to get a new motorcycle and how to start its engine. Sam loses his machine at the very beginning of the game and you will have to wait a little until you manage to own another vehicle.
Unfortunately, the loss of a motorcycle at the very beginning of the game cannot be prevented in any way, as its a part of the main story. During the first few hours of the game you will have to travel through the game world on foot. Even if you find a motorcycle somewhere in the game world, you won't be able to use it at first.
Things change after you finish the ninth main story quest - Order No. 9 - Power Supply Unit Delivery: Wind Farm. As a reminder, this quest concerns the delivery of a power supply device to a wind farm and on the way to this location you have to go through a forest where a large group of BT resides. One of the rewards for completing this quest and for establishing connection with the wind farm will be a generator blueprint.
You need to buy at least one piece of PCC, which is a gadget used for building various constructions. If you do not have any such items in your inventory or item cabinet, you can produce it by using crafting.
The first three-wheeled motorcycle is parked near the Distribution Center West of Capital Knot City. It's the spot from which you started your journey to the wind farm.
When you get there, choose the PCC item from the inventory and place the generator next to the parked motorcycle.
Note - You must select a generator from a list of known plans and also have the appropriate materials at your disposal.
The generator charges machines and vehicles wirelessly, so all you need to do is keep the bike as close to it as possible.
This motorcycle is defective by default, but you can easily repair it. Take it to the base and park it on the central plate, that is, on the elevator. It can be moved from this spot to the garage where it will automatically get repaired to 100% durability. You can use the Garage to store vehicles in order to avoid losing them.
From now on, you can use your new motorcycle to travel around the game world. Isn't that just fabulous? Norman Reedus driving a motorcycle in a suit with a fetus inside a glowing container, oh dear. In the area you can find other generators, including those placed by other players (if you are playing online).
The aforementioned motorcycle (which you've found and repaired) cannot be used until the end of the game. The hero loses access to it after embarking on a boat trip to the West. In the central part of the map, you have to get a new vehicle, whether a second motorcycle or a large four-wheeled car.
It is best to wait until you complete mission 23 - Retrieval: System Server. The mission is rewarded with blueprints for two motorcycles - classic tri-wheeled bike or a machine with longer reach but less cargo capacity. You can craft them thanks to the crafting mechanic and use them when exploring central regions of UCA.
Note - Each of the vehicles found in the game can be destroyed. The easiest way to cause this is to make a vehicle fall into the abyss. A destroyed motorcycle can't be fixed. When that happens, you have to find or make another machine.
It is worth noting that motorcycles aren't the only vehicles in Death Stranding. In the later part of the campaign, Sam will also be able to drive four-wheeled vehicles, whether stolen from MULE, found in allied locations or made using crafting materials. Focus on the orders and eventually, you will get access to them.