New Coleman models

[Fisher1983]

I just did a head comparison this week of mm212 vs Ducar/predator 224. MM212 uses 28.5 intake and 24mm exhaust and the ports / valve guides are setup for less turbulence and better flow. It actually uses shorter valve guides when comparing to predator 224 head. I was told by arc that is a great valve size for flow.

I had one of those MM212 bikes, and you're right. The head was out of this world compared to the others. I noticed how big the exhaust port was when I put a header on it. It was a lot bigger than the inlet of the header! It was also round IIRC. I did a lot of massaging to the header for proper flow. That bike stock was way stronger than my new B200RSV.