Hello

sorry if im not meant to be here i cant find a website that deals with these spy f3 Chinese quads and cant find accurate wiring diagrams so im stuck right now!

So i bought this spy f3 350cc 2021 plate for £500 (UK) but it is a none runner.

The issue I have is I have no spark going to the spark plug and fuel pump does not run as well when cranking engine over. I found a melted earth wire in the engine wiring loom and i tried tracing it but all it connects to is all the other earth wires which are all just joined together and then 1 big earth wires which going to battery negative. Before i buy a loom i would like to try get the engine started to at least know if engine is good.

I traced the fuel pump power wire and can see 2 wires, 1 is a earth and 1 goes to the ECU/CDI box.

i then traced the ignition coil wires and 1 is a earth and the other also goes to the ECU/CDI box so I'm thinking could the ECU be bad/fried?

i have ignition working, display screen works, horn and headlights work, brake light works etc just literally no spark and fuel.

i have manually tested the fuel pump with 12 volts and it runs no issues with 12V probe tester so pump is fine. I have also ohms tested the ignition coil and it reads 0.8 so within spec, Im thinking could the issue with spark and fuel be related together and if so where do i go from here. Is it likely i have a fried ecu?

Trying to do diagnose without a wiring diagram and not much information to go by if any at all