Just did a complete rebuild on a 09 yfz450r. Turn the key on and I have full power. I hit the starter button and it will roll over once and then kills everything until i release the button. Not sure if it's a ground issue or what to check first.
Only thing I can think is the ground. When I wired it back up the only wires I was unsure about was the nutural switch. And there is a 2nd wire coming from the negative post on the battery but idk where it goes?
I just bought a used 2016 Yamaha YFZ 450 R a few days ago. It’s practically brand new less than 20 hours on it. I noticed the light knocking noise in the motor is that common on these machines? That’s kind of what I’ve been hearing.