I use the # 415 Tricycle chain, much stronger than the cheap kit chain.
* # 415 standard fits the Grubee engine sprocket. # 415 HD [ go Kart Chain ] is too wide to clear. Pirate Cycle sells the Trike chain,
you may need 2 if you have a big rear sprocket . I'd order extra master, and 1/2 link, just in case.
My China Chain lasted aprox. 10 miles, the Tricycle chain has been on for a couple seasons.