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Hate to say it, but unless china did something stupid with the fuel pumps, you can run a 750cc lawnmower engine wide open on a vacuum pump.....john deere does it every day..... crank case pressure should be driving the pump off the crankcase vent, and that will rise with more rpm....
If it wont fire on starting fluid, i would be checking compression, if thats good, i would get a new CDI box/ignitor... you may have spark, but is it 1. Strong enough to ignite under pressure 2. Sparking at the correct timing. China is known for cheap unreliable cdi ignitions....
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