https://www.amazon.com/dp/B081TT4FD5/ref=cm_sw_r_cp_api_glt_fabc_1BDMBNS7S2K8WXXP1PP8?_encoding=UTF8&psc=1
You're gonna want to order something like this or you can make one outa JB weld but it won't stay forever and yes it could happen again usually it chain tension issues but sometimes it just happens
https://www.amazon.com/sthus-Motorized-Bicycle-Engine-Motor/dp/B081TT4FD5/ref=mp_s_a_1_8?crid=1TGCLKK4RR9J2&keywords=80cc+motorized+gas+bike+stop+motor+chain+lock+up+part+kit&qid=1678578652&sprefix=motorized+bike+chain+lock%2Caps%2C204&sr=8-8