ericandchi wrote:A few years back I replaced my aging rear master cylinder with a cheapo one. The seals shortly gave out. I looked over at my 2014 Grom and realized it had the exact same size and config as my mc28. I now have a Honda oem part that I have confidence the seals won't give out. Cost was just over $50.

My point is, don't buy a cheap one, but don't feel you got to get an mc21 part.

Good point. Previous owner actually had a cheap one on there that was starting to give me some issues. I did end up finding an OEM on eBay, looks a little rough but seems to be working good. I’ll clean it up and rebuild if necessary.

I’m now looking for a Gear position sensor. Mine only has the neutral wire coming out of it.