49cc gear wheel broken?

Hi Guys,

I was out riding last weekend when I heard an loud noise of something getting chewed up in my motor and jolted my bike pretty good. I could hear something rattling around in the motor, like little bits and pieces. I managed to ride it home without any issues besides the rattling noise.

Today I drained the oil and found chewed up plastic parts that looked like teeth on a gear. I got off every screw and bolt I could on the one side, but the crank case wouldn't open. Not sure what else I needed to get it open or if they are very hard to get open the first time?

I think the broken part is the gear wheel according to this diagram. Number 14? http://www.bicycle-engines.com/49cc-engine-parts-diagram.html

I found a parts site for the Honda, it looks like it called something else on this site though. http://www.ereplacementparts.com/ho...l-engine-parts-c-37657_37658_38011_64846.html

Has anyone replaced this part or know what it is? Is it an easy fix?

http://www.ereplacementparts.com/ho...l-engine-parts-c-37657_37658_38011_64846.html

I got the side cover off and found a lot of broken plastic pieces. Now I need to order the part. When I was prying off the side cover some other pieces came loose and I don't know where they go. What are these parts in the pictures?

Last night I convinced myself to buy the 79cc from HF. $90 shipped, pretty sweet. I'm planning on fixing this motor up and selling it.