I'm looking for some input. I'm missing an o-ring in this location. There was not one when I removed the rocker assembly and I forgot to order one when I ordered my parts online. Honda says it is a 7x1.7 o-ring, but that's all the information I have.

This is the part number: 91312-107-000

I think someone had removed the rocker assembly in the past and never put this o-ring back in. The local honda parts places don't have this part, unfortunately.

I would assume the size it 7mm in OD and 1.7mm in the thickness of the o-ring. That should be all the details needed for the size.

The question is, WHAT should it be made of? I know there are tons of different materials that o-rings are made of and I'd like this to be the right one considering where it is and the heat it will constantly be exposed to. I'm hoping to go to a local parts store (napa, etc...) and get one that would work so the head and rocker assembly aren't just sitting exposed and open.

 

I ended up finding an OE one at a honda motorcycle shop locally. When I called a company online it came up through motorcycle parts, so that's what made me think of that.