[kz1000st]

The stock belt on my 150cc GY6 needed replacement at 2500 miles. It could be that your Jiajue has a Gates belt already since Gates belts are made in China these days. My Gates Aramid replacement got replaced at 8,000 miles since it was six years old at that point and I didn't want to risk it thought the belt was still in good condition.

Valve adjustment/inspection should be done at 1,000 miles or so. A 50cc GY6 only has a clearance of .002 inch to start with and can use that up pretty quickly. After the initial adjustment it will go another 2,000 miles before needing a look at an may just be holding fine.

It is a common myth that a brand name scooter will outlast a Chinese 50cc but it isn't so. The 50cc GY6 was originally designed at 80cc and was debored to 50cc since it was a more common size. Many of the 50cc scooters are going outrageous mileages and running strong.

Several years ago I saw a picture of a two year old Bintelli 50cc with 20,000 miles on the clock and running strong. Three years ago I also saw a story of a young man with zero mechanical finesse riding a used Bintelli Scorch 50cc from Michigan to Key West with no breakdowns. The Chinese have virtually taken over the 50cc market and brand name offerings are slowly disappearing as a result.

Don't worry that it's Chinese and enjoy the ride. It will be running for a good, long time.