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

 

The fried earth will go to the rest of the earths in one direction but where does it go in the other? Just done a Google and got https://suprememotos.com/other_makes...-in-store.html so Spy Racing must be the importer and almost certain that they import some Chinese make and stick their own name on it. Which is why, only they will have info on a bike with that name, though it could be imported and sold under other names.

 

thank you for your reply, looks like the original maker of the quad bike is called JINLING and spy just rebranded it.

It’s just 1 earth wire connected to battery negative and all the other earths are joined to this 1 earth.

so all the sensors etc that need earthing at the front of the quad are joined to this 1 earth, the 1 earth then routes to the back of the quad where all the sensors at the rear of the quad will join to this 1 earth wire and then theres a wire that goes to the battery. Not sure if thats how it meant to be from factory as cant find a wiring diagram at all for this

 

guys not getting anywhere with this. I have disconnected kill switch to make sure thats not the cause and i cant see any fuel pump relays on the circuit, have checked all the fuses that i can see they are all good. The fuel pump wiring comes from the ECU/CDI which i dont see a way of testing and so does the ignition coil wiring comes from the ECU/CDI.

Is there anything else it could be before i bite the bullet and buy a ECU?

 

I have fuel pump running now!!! I also have 12 volts going to the ignition coil now but sadly no spark.

The red battery wire had a inline fuse and i dont think this fuse is meant to be there, after bypassing the fuse by connecting the red wire straight to battery I now have engine light coming on and fuel pump priming and ignition coil getting 12 volts but still no spark

Im thinking the ignition coil is bad now and for the sake of £15 i will just buy that and try it as it cant be power issue now as getting 12 volts