I have a 06 Honda rancher 350 when I push the start button it losing all power all lights go out I put a new battery in it and now it just cranks but won’t start. I don’t think it’s the carburetor I have cleaned it and it basically new. Could it be a voltage regulator, battery or stator?

 

With the new battery do the "lights go out" when you push the start button? If so you have either a bad connection in the red wire going from battery to main fuse to ignition switch, or you have a bad earth on battery, or frame, or engine. Other possibility your new battery is flat, but it wouldn't spin the starter if it was dead flat.

 

No the lights stay on it just cranks but won’t start

 

Check for a spark, fit a new plug. I assume the bike has stood for a while before you fitted the new battery. If so it may need the carb cleaning, stale fuel can also prevent an engine starting.