1989 dt6

[Jamiegrady]

Wondering if anyone knows what this is for. Any manuals i find doesnt have this in it.
looks like a hose fitting that has been crimped.

thanks.

[Solarman]

Looks like an add-on someone did, it appears to be into the water passage of the cylinder head, maybe used for a pressure gauge, or possiblity of previous overheat problem in the head, and they wanted to try getting more water to flow through the head? I can't think of any other reasons?

Unless the factory cap that was originally there started leaking, and the earlier owner put that in to stop the leak, instead of buying a new head (most plausible thought)?

If no problems, I would ignore it.

Good luck.