I recently got two B100 powerheads and one nice bowbar with chain for one of them. The powerheads are mostly complete but missing a few smaller parts. I need an ignition kill-switch for one. The tank on one has a tab broken off the bottom... could be repaired with JB Weld, filed and shaped and re-tapped for the long bolt which connects it. Might be easier and take less time to replace that tank with a whole one... depending on cost. I will be looking for a straight bar and chain for the one. When I get into repairing and restoring, may need other smaller parts.
I look forward to seeing photos of what B100 parts you have.