Bro I'm having that exact prob my motor starts but makes a gurgly sound when I try to acclerate sum1 plz help .... I just built the bike and it ran a lil before doing this
Here's the basic troubleshooting checklist for all petrol motors:
1. Check for spark. Pull the spark plug out. Put the boot back on it, and ground the plug on the motor (metal to metal contact). Turn the pedal of the bike with the clutch in gear, and look for spark.
2. Check spark plug condition. Did you foul it with anything? A little brake cleaner will do wonders for it if the plug isn't nice and clean.
3. Shine a light down the spark plug hole. Look and see if there's fuel puddled on the piston. If there is, tighten down on your carby to restrict the flow more. With any carbureted motor, there is going to be fine tuning to get proper flow.
4. Check for compression. If you're in the US, you can get a compression tester kit from AutoZone or Advance, and you'll get your money back when you return it in good condition.
5. Check your chain. Make sure it's not too tight (there is such a thing) and providing too much resistance against the motor. If the motor can't spin properly, then it'll bog down.
Though to me it sounds like bad spark/too much fuel. When you start it and it idles, do you get exhaust that smells extremely powerfully of petrol? If you do and no smoke, you've got no spark. If you're getting stinky black smoke, you're flooding the engine.