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Thanks for the responses, I definitly know it's not a fuel flow problem. I bought the see thru glass fuel filter from autozone and I can see that it's full of gas. When I crank it I can see the gas moving down the tube and refilling the filter. The carb had plenty of gas in it when I took it apart. Also, the petcock is screwed into the tank.

I've run into this same problem again. I few months ago I posted that my 50cc scoot wouldn't start after storing it for the winter. I cleaned the carb inside and out and it ran great. I haven't been riding it because I have another scoot, but I tried to start it today and it turns on then dies after a few seconds. I took the carb out and cleaned it out and put it all back together but the same thing happens. Here is what I did also:

1. Checked the battery for 12V
2. Checked the vacuum hoses for leaks
3. Checked for spark (have a nice blue spark)
4. Checked forf compression with my finger and there was
pressure
5. Adjusted the valves, they were almost closed so I made
them .004 top and bottom

One thing I must mention is that while cleaning the carb I assume the bigger jet is the main jet and the smaller is the pilot? Well, I clean out the jets with carb cleaner and use a tiny wire to make sure none of the small holes are clogged. I noticed with the smaller jet I can't get the wire all the way through. Is the hole supposed to be that narrow that the wire can't get through?

By the way, I've had the same gas in the tank since November but I used sta-bil for the for that non-riding time. Could that be a reason it starts then dies? I'm looking for any help!!!

The problem was happening before I cleaned the carb. I cleaned the carb because I left the gas in it all winter, from November to now. I figured the carb had some stale gas in it. I also have a Peace Sports 50cc that would start but once I gave it throttle it would die. Someone suggested that the carb needed to be cleaned on the 50cc which I did, and it works great now. I figured that my 150cc had sort of the same problem and most people always suggest that you clean the carb and adjust the valves when there are running problems.

Well I adjusted the valves yesterday. Top was still at .004 (so I didn't touch it) and bottom was completely closed! I adjusted the bottom to .005, now after putting everything back together and starting the engine, there's excessive tapping!!! Should I bring it down the bottom to .004?

For some reason, my Roketa 150cc never starts on the first try. I'm happy that it does start eventually, but I still think it's unusual that now it takes 2 to 3 times to get it started. For the past week and a half I've had to give it a little throttle in order to start. When I hit the start button, it doesn't do anything for about 2 seconds then it fires up after the second or third time. So why would it take 2 seconds to react after hitting the start? When the engine is warm and I take a trip to the store, it fires right back up normally so I don't think it's the valves because they'd close after the engine is warm right?! Could my starter solenoid be going bad? By the way, I adjusted my valves last year (.004 and .005) and cleaned the carb this past Saturday. Any ideas?

Thanks for the help. I will clean it and let you guys know what happens.