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Not knowing more, I would start to try to eliminate the easy stuff first. Going with the basic "air, fuel, spark" approach (all things an egnine needs to run... well, besides oil), I'd check:
1. Check the fuel - maybe put in fresh fuel?
2. How does the spark plug look? oil fouled or clean?
3. Battery strong?
4. Have you checked spark across the spark plug gap when trying to start the bike? (to ensure you have good spark? Best to hold the spark plug & boot with a pair of pliers to avoid getting shocked.)
5. Air filter clean and no obstruction?
6. Assuming it is carbureted, the carburetor is clean and bowls/floats aren't stuck?
If all those are found to be OK, I'd look into the valve gaps to see if those are set properly. I'm not sure what the gap should be between the rocker arms and the valve stem, so maybe check online to see if there's a specification for this engine.
Good luck.
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