I was going to install an o-ring chain on my yz but stopped, but the chain didn't chain the case around the counter shaft sprocket. the chain is just wide enough like 1mm to wide where the pins on the chain can rub the case. The chain is a DID 520v o-ring one of the smaller ones in width. Would getting a case gaurd solve this? Or do I need to install like a washer on the shaft to get the extra clearance I need. Thanks.