Wanna gear up or gear down your E50 Motor? It's easy. I'll walk through how to replace the drive sprocket on your E50 (and ZA50 motor, BTW) motor!
Just to let you know....
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Check it out here: www.techshop.ws
Step 1: Removal of Drive Sprocket
Let's start by removing the drive chain. I've already made an Instructable on how to do that, so here's a link to that, if you need help removing the drive chain....
Once the drive chain is off, grab a pair of snap ring pliers. I'm changing from a 16 tooth sprocket, to a 14 tooth sprocket. You will see a snap ring holding on the drive sprocket. Simply expand the snap ring that holds the sprocket to the splined drive shaft, and remove it.
At this point, you can remove the sprocket.
Step 2: Install New Sprocket
Go ahead and put on the new sprocket. It should go on pretty easily. Just wiggle it onto the splined drive shaft, past the snap ring grove.
After you have the new sprocket on, replace the snap ring onto the drive shaft.
Reinstall the drive chain. You may need to add or remove links from your drive chain in order to properly tension the chain. But that's about it.
Here's the link again on breaking the chain, if you need it...