2006 Sportsman 500 X2 wont run

I hope some can help me. My problems started by the machine stalling with the digital display going blank. If keep turning the switch on and off eventually it will come back on and then you can try to crank it again. Now it wont start at all. I have replaced the spark plug, key switch, I took the breather off the carburetor and poured some gas in the intake and it would start momentarily, so I checked the gas line and it has gas flowing, I looked at the injector but I have no way to test it. Next I went to the fuel pump and it runs but again I have no way to test the PSI on it.
Now I have read from another owner of the same model with the same problems that the problem might be either
1.An over charging voltage regulator and he wrote 55cb#2 which I have no idea what that is. Where is the voltage regulator and how can I test it?
2. A loose fusible link from starter solenoid to red wire main B+line.
I can mechanic on it, but I am by no means a professional mechanic, I would greatly appreciate any help...

Part out of carb don’t know where it’s for

Hey guys I am having trouble trying to find out where a part goes in a carb off of a 2003 sportsman 500 HO. To start I will give a little background on the four wheeler first. I had it out for a weekend and it ran great found out that it was charging the battery so I figured I would get a new stator and put it on when I got home loaded on the trailer drove 4 hours home and bam won’t start now to get to off the trailer thinking it was the battery gone dead tried to boost it and all it did was backfire so I thought I would just push it in to the shop and look at it in there. I thought maybe the trigger coil was bad I bought and new stator with the coil on the harness put it in and a new rectifier on put it all back together and still no start just cranking. Killed that battery so went out and got a new one and new plug while I was at it put them both in and still nothing not even an attempt to fire. Put gas in the spark plug hole and it wanted to start but nothing now that I had it wanting to start I thought it was a fuel problem so off came the carb for the first time to clean it since I can’t remember the last time it was done. Pull the float cover off and this little brass piece was sitting in there. I thought it was the problem for a no start but can’t for the life of me figure out where it goes. Thinking I would try it out with out putting it back in cleaned the rest of the carb up put it back on and turn the key and now it wants to start but only ran for a second and died. Go out and buy a rebuild kit thinking maybe it broke off of something and couldn’t find anything that was close to it on anything. Put the whole rebuild kit in the carb and try to start it still the same thing wants to start but after a second it dies. I was reading on one of the forums about the trigger coil being to big of a gap so I made the holes bigger in it and moved it to .020 with a feeler gauge and still nothing so now I’m back to this piece of brass out of the carb I have attached a picture of it beside a 1/4” bit so you can see the size of it. I have looked everywhere on the thing and can’t seem to find any place that it fits or broken off of thanks in advance

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