Hello everyone. I bought a 50cc Chinese atv for my niece some time ago and have lost the spark plug for it. I've tried different plugs, only one that fits the thread is a ls1 plug, which is 14mm, but the depth is wrong. I was wondering if anyone by chance knew which plug was needed for the atv. It's only markings are; ns 50atv-m on the handle bars, and madami on the side case of the engine. It's a 2 stroke 50cc atv. I've researched the company from the ns 50atv-m marking, which comes back to nunsun motors, yet I cant find anything other then that about them. I'm guessing they either went belly up or changed their name.
Any help would be greatly appreciated.

 

A better pic of engine would help, but that looks like the standard Chinese 50cc 2 stroke scooter engine, popular about 10-20 years ago, before Honda Cub clone 50s became almost universal. Someone on here should have a Quad with that engine.