What's gasoline L400's firing order?

The 4 thinner red wires are the spark plug wires.
Each wire goes to a specific cylinder.   
The manual needs a diagram of the distributor, showing each of the 4 spark plug wires corresponding cylinder

Also, the manual needs a reference showing the distributor and each spark plug wire’s corresponding cylinder.

( The distributor has 4 red spark plug wires, but the distributor isn’t numbered, showing what wire goes to which cylinder )

Pretty sure the L400’s cylinder firing order is:

1-3-4-2

Just need the distributor spark plug wire positions

How to Adjust the main and auxiliary oil needles for Toyan FS-L400BGC Engine ?

Adjustment standard: Turn the main oil needle to the bottom and then turn it back two turns. Turn the auxiliary oil needle to the bottom and turn it back one and a half turns.

Why Needle O-ring breaks easily?

The O-ring needs to be tightly fitted and the material must have good sealing properties. It must be small and easy to break during assembly.

Why there is no O-ring on the cylinder liner?

The step surface on the cylinder liner is required by the process design, and there is no need to install an O-ring.

Why The piston ring surface is gold and uncoated?

The piston rings require heat treatment. It is normal for the surface to appear golden. The piston rings are not coated.

Why There are steps inside the cylinder?

Design requires leak-free process

Why there are Gasket deformation?

1.The heating of the machine will cause deformation. The polytetrafluoroethylene material is too hard and has poor sealing properties, so the material cannot be changed.

Why There is a bracket in the intake pipe and exhaust pipe?

The production process is to 3D print the bracket to avoid difficulties

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