Purchased a replacement starter ring gear from Ryan @ Winters Machining. Good people, good product. Followed Ryan's recommendation and tack welded the gear in place after welding it on. After assembly the trike would start but misfire at anything above idle. After much head scratching it was determined that the tack weld material was close enough to the pulse generator to signal an ignition event. I won't embarrass myself by sharing how much other s*&% I looked at before figuring this out. Hope it helps someone else avoid the trauma.