Topic: What are this caps for?

[mazingerzeca]

They are on the engine crankcases of my Honda cb 125 s, and they are connected to oil galleries. Is this a safety system for oil overpressure?

[754]

It is probably a cross drill hole..that is to say a hole that connects to 1 or more other oil passages (because they cant cast them in reliably) It would not ever be meant to come out, but if you want a pressure guage or cooler rocker feed it may be a good point to tap in.