Originally Posted by heretolearn
That hole is hollow, I checked it with a flash light and the problem it would cause was the nut that goes there would constantly get loose and cause engine not to start.
I see. Will it's very easy to fix. Everything on these motors is easy to work on. You're going to need a gear puller tool. This is what it looks like. The same tool pulls all the gears and sprockets off all the shafts. All the motor bicycle webb stores sell it. About $4. You need to order the tool, and get a key at the same time.
Here's what you need.