Hi i have a 2000 yz426f, i just recently put a bunch of parts on my bike one of which was a front sprocket. While i was putting it on i put the bike in gear and proceeded to tighten it with a breaker bar when the engine turned over the wrong way (aka the crankshaft went clockwise instead of counter). I assumed nothing of it other than it just turned the wrong way. When i was putting all the levers back on my bike i noticed the decompression lever was really loose. I then played with it, pulling it in and kicking the bike over a few times and it returned to a stiff pull so i thought everything was good. After everything got back together (after about 2 weeks of working on it after i only had the bike for a day) i noticed a ticking noise coming from the engine that i didn't remember being there. After closer inspection i noticed that it was coming from the decompression switch on the engine. it was ticking back and forth noticeable but the engine still ran fine so i proceeded to ride it for 20 minutes thinking maybe it was the oil i put in it (yamalube 20w 50w) or the lower octane gas i put in it. but after that it was still ticking to i took it home right away. Im not a big mechanic so i don't know much about the engines but i can definitely tell that its the decompression part. I can back this up because when i touch the lever on the handlebars it vibrates a lot. If anybody could please help that would be great.