karl, May I suggest that you ask this as a question on [link|https://www.ifixit.com/Answers|#Answers]?
Just explain that you have such and such model inverter generator, and what symptoms you have. Include what you have tried and what the results were. [guide|151081|How to ask a good question on iFixit].
There is no real way of writing a guide on a product, unless you have the product in hand and can take detailed pictures, etc.
As for your problem of no spark, it could be one of any number of reasons:
# Faulty coil (ignition module)
# Faulty oil sensor switch (if it has one)
# Low oil (if it has an oil sensor switch)
# Bad ground / wiring