Hello people. I am fairly new to the group. I have two different bikes one is a 49cc skyhawk and I think the other is a 80cc don't know the name brand. It's kinda a ray bike. I bought the bottom end off line an been building it up for the last 5 months. I just finally got it running a few days ago. An I got to ride it for a day and my chain snapped. An I'm gonna have a few questions for you guys. Because I noticed that this engine is way different than my other one. This one seems to vibrate way more. An seems to make a Lil bit more noise. But OK people have a great day