Quote:

There's a pic that PieMan posted in General Tech on 2/24/16 that I think will show the differences. I tried to link, but pics didn't follow.

IIRC, one of the threads gave the actual serial number when the change was made, but I couldn't locate that. I believe it was on the '06 790s. My 11/05 build date 790 has the newer design. Not sure about the 865s.



just to further muddy the waters:
I have a 05 speedmaster that was a 865 motor, the bike came off the line in November of 2004. It had the newer design breather. It is one of the entirely black case motors.

last fall, I did put on the TTP kit as I was doing the clutch anyway. But close to 40K miles and it had not broken yet.

05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter