I saw a couple about an 1/8th inch apart, I lined it up with the one on the left (the firing one?) It seems to run ok, but it backfires or pops out the exhaust just a bit when revving at a standstill. Sounds pretty good tho riding around, and pulls hard. I was about ready to chalk the popping up to the instantaneous richness of releasing the throttle. Now I'm not sure. It would be nice if the pics in the manual looked anything like reality.
I did rotate the whole assy after installation. I'm still a bit worried about it though.
Mods: open airbox, ProDesigns K&N filter, Jokers pipe & silencer, jetting 170/48, exhaust cam retarded one tooth