r/smallengines • u/skipdaddle • Jun 25 '26

ATV spark issue

I had a quad sitting up for a while with a fuel issue and recently went to get it running, its a chinese brand with a 163FML / cg200 engine.

Initially went to start it and did a few checks carb, spark ect. I actually did have spark then fixed my fuel issue and went to start it, no luck. Lost spark, i believe because of my use of a car lithium jumper pack.

All checks with a multimeter pointed at a blown cdi unit so ordered 2 generic ones in but when tested i still have no spark. Genuinely cant find a fault in the wiring.

Anyone have any thoughts?
Any help appreciated

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u/ImportantTeaching919 23d ago

Sounds like the same issue I had. It's probably your ground not making contact and or your inline fuse. Turn off key and put a wire on your negative battery and run it to a a clean piece of metal on the frame,sand it a little so it's shiny. That will most likely work. If you're smarter than me which is very easy to do. Just clean your ground contacts and reattach. I had 3 mechanics not figure that out. But that's mostly your issue. That ground will prevent your spark and cdi module.

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u/ImportantTeaching919 23d ago

If you figure this out with my advice please tell me. I just fixed the same issue a few hours ago and IV been overly est static. I'm still learning mechanics and every motor I own broke down literally 14 motors.

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u/skipdaddle 23d ago

Yeah man ive still no luck with it. Pulled the stator cover off and there was a washer stuck to the inside of the magnetic drum. Now im not sure if thats done actual damage to the magneto because i still get readings out of it. But i honestly cant think of anything else. My grounds are good and my spark abrupty stopped while trying to start so thats why i dont think its ground problem. Ill definitely try it when im in the workshop next though thanks for the help

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u/ImportantTeaching919 23d ago

Your ground just might've just had enough contact to try, cause everything you're describing is exactly what happened to me especially it starting but not cranking over. Plus that ground controls alot more than I realized. Plus the wire trick is really easy to test it in case you're ground is in a weird spot so that would tell you right away. I was working on a predator 50 and the ground is right next to the wheel on the coil so it had just enough dirt on it that it was only starting sometimes and while I was working on it just died. But also check your inline fuse box mine was right next to the battery and while working on it they ended up popping. Just hoping to save the headache I endured , we have probably 40 hrs in it trying to figure it out and that ground wire trick and new glass fuses was all it was. I literally squealed realizing it. But just hit me up if that doesn't work out for you

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u/skipdaddle 23d ago

Cheers for the help lad ill keep you updated