Yes, I'm reviving this thread. I am still having the same old problem as I was 4 months ago. I lost motivation to figure out the problem, but now I'm back.
Here is my issue: I pedal down the street, release the clutch, engine starts. Then I give it gas, the engine revs a little, but then it just dies out.
To me, it sounds just like a weed eater if the choke isn't adjusted properly. I've tried adjust the choke, to no avail. I've tried tightening the cable that connects to the throttle, but that doesn't help. I don't know what the problem is. I've applied sealant as described a couple posts above here.
Someone please help. This is extremely annoying. I bought this engine kit 6 months ago, and I have never gotten it to work. I probably should have called gasbike.net and complained, but I didn't. Now I assume it's too late for them to help me.