Lifan/chinese engine reliability question

[my67xr]

Show and Go on Brighton rd would have a new old stock JT sprocket or similar for about $10
take one as a sample and you can match them up.
Sprockets Honda Kawasaki Suzuki Yamaha Front AND Rear Sprockets JT Sprockets | eBay
Or from Ebay, about $10 including delivery
17mm 420 14 Teeth Front Chain Sprocket 50cc 110cc 125cc ATV Quad Dirt Bike Buggy | eBay
17T Teeth 17mm 420 Chain Front Sprocket COG PIT Trail Quad Dirt Bike ATV Buggy | eBay

 

[gottagetacheaperhobby]

Check what pitch your chain is to, im pretty sure the posties run 428 chains on them..