To follow up on may 29th post' ADRESSING BACKFIRING PROBLEM'.  Info given on this forum was a great help and a big THANK YOU!  Only stripped 1 carb cover screw and used 2(two) 3/32nd washers discarding the spacer.
The 3/32 washers fit better than the 4mm.  Tank removal the first time is a learning experience. drain it or run it low and it will be easier to handle(found out the hard way.) Carb cover screw is 5mm round, 10mm long...purchased at NAPA outo parts.  Seat mod is next.
Cycle runs great.