Your bike is a 125cc giovanni dirt bike you can find parts on giobikes.com.when you bump start it have the bike in second gear and the clutch in a once at speed jump down on the seat as u let go of the clutch this will help get ur tire to crack the motor over.
Try pushing it faster and try another gear 3rd is usually good and try sort of jumping downwards as you drop the clutch
SOURCE: Atomik Pit Bike
After hunting around the web for a few, it sounds like the spring is from the timing chain tensioner. It looks like there is a button on the end of the cylinder, that end goes in first, then the spring. See if the spring is the same on both ends, the picture looks like it's smaller at one end and that end goes into the tensioner, not the bolt. I'll include a screen shot of the picture.
Good luck!
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