How do you get the spark plugs out of a Buel XB9S motorcycle without pulling the motor?

Take the left side air vent off. Use a 5/8 socket and a 5/8 wrench and work the front one out.

The rear one you go in from the left side with a 5/8 socket, swivel, and a 6 inch extension. you can reach up under the frame with your left hand where you took the air vent out and guide it in.

Use a piece of fuel line to guide the new ones in without cross threading them.