Hello! I have two problems with a Piaggio Liberty 50 4-stroke built in 2011, 30,000 km. It starts with a cold engine extremely hard. With a mixture of E- and Kickstarter it runs after a few minutes, if you lightly give gas. If you turn on the gas grip, it goes out again. If you let it on a little bit, you can at some point slowly increase the gas in a stand. If you give a short full gas and the engine is warm then it starts with the E-starter. If you start the gas grip The light is darker with such a hold. When you drive, everything works perfectly, except for the horn. This is quieter depending on the speed. Sometimes it is hard to hear, sometimes a little louder, I could not reliably determine a pattern. The battery was changed several times. Do the problems when starting and the horn hang together? Is what generally not true with the electrics? How can I proceed to the diagnosis, it always goes out. ?