Here's a picture of :
A. The NGK replacement caps (part #'s LD05F - short, and XD05F - long) with rubber boots in place. You'll need 2 of each cap type, short and long.
B. A spark plug connector screw into the flush-cut end of the 7 MM spark plug wire.
C. The other end of the spark plug wire at the right side of the picture is stripped (about a 1/4 inch) for the crimp-on connector/terminal that's inserted into the ignition coil. The left side of the picture shows the wire end with the connector crimped on. Notice the bare wire is folded back and crimped under the connector/terminal. You'll need 10 to 12 feet of spark plug wire to replace all four wires on your BUBF.
D. The caps can be purchased on line. I checked today (4/2008) and www.denniskirk.com has these NGK caps at a fair price (Google will list other online caps vendors). The metal crimp-on connector/terminals are available at NAPA and many other auto supply vendors.
E. Have about a dozen wire ties handy for securing the new wires to the bike frame.
The procedure for installation is pretty straightforward:
1. Replace one wire at a time starting with the longest wire. Use a pair of wire snips to cut the wire ties holding the old wire to the bike frame.
2. Measure and cut from the bulk wire the same length as the old wire with about 3-4 inches extra.
3. Strip the new wire and crimp-on the ignition coil connector/terminal and insert into coil. Then carefully thread the new wire along the old wire's path and secure with wire ties.
4. Line-up the free end of wire with the spark plug and cut to length.
5A. You always want the best contact between a recessed screw in the spark plug (SP) cap and the wire's copper core conductor (this write-up does not discuss other conductor types). On a newly cut wire, you should see a bundle of copper stands in the middle of the wire. Push the new boot cap on to the wire.
5B. Screw the cap into the wire strands until you feel resistance, then turn the cap a 1/4 turn more to snug it up while orienting the cap to the wire's spark plug. Push the wire boot down over the cap and install the spark plug boot. Smear a little dielectric grease evenly around the inside of the boot were it makes contact with the spark plug. You're good to go.
6. Do the same for the other three (3) spark plug wires, longest first.
NOTE: If a spark plug wire is accidentally pulled out of the cap, in most cases you can remove the spark plug cap, screw the cap back into the spark plug wire, re-install the cap, and continue your ride. If the bike runs OK, you're all set. But if the bike is running poorly on that cylinder or the wire comes out again, it's a good idea to fully check the cap and wire.
Looking at the spark plug flush-cut wire cap end, you should see several copper wire strands around the outside of the hole created by the cap's tapered screw. If you see no, or only 2-3 copper wire strands, use a sharp knife or razor blade to flush-cut through the spark plug wire a 1/16th of an inch at a time until you see several copper wire strands either in a bunch, or spaced around the narrower old screw hole in the middle of the SP wire. Go to (5B) above.