Really really rough idle

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hey I have a 2012 jonway gator, I know that doesn't really matter since it's all a Chinese gy6. I got the scooter from someone it didn't idle at all. I've had to put in a new crank, air filter, vairator, clutch, belt, timing chain, a new 72cc bbk, new rocker arms, new carb, new bendix, new starter relay, mirrors, studs and new kick start. After all this, it will still not idle and won't go above 30 mph. I set the valve lash at .003, where I could just hardly pull out the feeler gauge, never adjusted valves on anything else so not sure if that's right or not. Please help! It's been 4 months now and nothing! And I'm all out of money!