Can be added to a Raft to give extra speed!
A Boat Motor can be crafted using 1 Fuel Tank + 1 Carburetor + 1 Engine + 1 Propeller + 1 Stick + 1 Duct Tape
Be careful when using this, because Marlin will ram into your Raft, sometimes concluding you to fall off.
Here is the JSON script for the boat engine modifier. Please do something with it.
[9]Combination":{"name":"Boat Motor","description":"Attach to a raft for speed!","modifierDescription":"Modifier description goes here.","prefabAssetName":"Prefabs/StrandedObjects/Building/Balanced/FOUNDATION_RAFT_MOTOR.prefab","isPlaceable":true,"isExtension":false,"isModifier":false,"isNotified":false,"materials":{"[0]Material":"BUILDING_ENGINE","[1]Material":"BUILDING_ENGINE_PUMP","[2]Material":"BUILDING_ENGINE_CANISTER","[3]Material":"BUILDING_ENGINE_PROPELLER","[4]Material":"CRAFTING_STICK","[5]Material":"TOOLS_DUCTTAPE"}}}