Hello and welcome to Just Answer,
The firing order for that engine is 1-3-4-2. See attached link andd click on download and wait for the timer to expire and then click on download again. That is the complete owners manual.
Ok, Thank you for your research and answer.
However, the manual / link that you provide is for the W4-1770E.
The engine that I have is not the "E" model. Mine is a W4-1770
My model has standard carburation and no emissions equipment or sensors.
Do you know if the firing order is still the same for my engine?
What is the correct order to attach the plug wires to the rotor cap. Some of my research indicates that is does not correlate to the firing order due to the speed at which the distributor rotates.
See this link and do the same as you did with the last one. This is for the VH4D. Your engine is the later version of that engine and many of the parts are the same. The firing order and spark plug wire locations should be the same as yours.