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My thinking is that you are running out of fuel in the carb. IOW, the fuel pump is not supplying enough.
I have seen this issue with several scooters that have vacuum powered fuel pumps. My own 250b has problems starting because of a lack of fuel. There are videos and people complaining of it on you tube.
Yesterday I took a Ruckus 150 for a few test rides. It was hard to start and the owner carried a can of starting fluid. The test rides all showed that it was running out of fuel on hard full throttle running under stress.
Every quick test yielded no improvement, same as my testing on my 250b -- currently researching an electric pump that can do the job, but not flood the engine.
Since your little bottle NOS kit did nothing, I suspect you are running out of fuel as well, since NOS needs more fuel to work.
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