Hello everyone I’m new to this forum and semi new with atvs. I currently have a 2000 Honda 400ex. I have owned it for a couple weeks the person I bought it off of said that the engine was just rebuild a couple years ago and a high compression piston was put into it along with kibble white racing valve springs. The problem I’m having is when I start it up whens its cold it makes a loud ting noise or tick noise. After 5-10 mins of riding it goes away. I just checked the valve adjustment and everything was perfect. The noise is definitely coming from the top right side of the engine. its also very weird that it will start and stop randomly without changing the idle speed. I have done a little research and keep reading about the mechanical decompressor making nose. I was wondering if anyone had any ideas on what might be causing this and if it is something i should be worried about. Here is a link to a video of the noise this was right after a started it up. Thank you in advance!
