DG Sports "Sunburst" head - worth doing?

[Serious Tim]

I picked up what I can identify as being a DG Sunburst head that was on a 1978 YZ125, and had thought of putting it on my YT125 Tri-Moto, but what, if any performance gains would I realize, aside from better cooling due to the larger heatsinks?

[Vealmonkey]

You would have to check the dome area inside the head. If it is smaller, than it would boost the compression up. Exactly how much, I don't know. I'm sure there is a formula to figure out the compression ratio. Or try and find out what the stock compression ratio is for a yz125. I guess it would depend on the top of the piston and what thickness gasket also. If your not going to use it, let me know and I would see about buying it from you. I think you would really have to use a better exhaust pipe and carb for the head to really work to it's full advantage. Pipes for the yt125 are really hard to find.