Set of 4 new spark plug resistor covers replaces NGK's now discontinued XD05F for the Honda CB650 and GL1100/1200, see fitment list below. For 12mm or 10mm thread spark plugs without the terminal nut. We recommend using non-resistor type spark plugs when using resistor caps on vintage Honda's.

Fits any bike as long as you have 7mm spark plug wires and enough clearance. 

Rubber waterproof boots to seal out the elements, so the engine won't cut out if it rains.

For use with 7mm diameter plug wires

Installation tips:

Remove terminal nut before installing new spark plugs. It's screwed onto the top of the spark plug.
Put a light coating of anti-seize on the spark plug threading before installing. After all, you're threading a steel part into a aluminum engine case.
Don't over tighten the spark plug, 1/8 to 1/4 turn past finger tight.
When using the old spark plug wires, trim them back 1/4" - 1/2" to expose fresh wire, then using a pick type tool, fan out the wires before threading on the new resistor cover.
Twist on the new cover about 3 full turns and give it a tug to make sure it's snug.

Replaces NGK Part Number: 8072
Replaces Honda Part Number: 30700-MC8-000, 30700-KR3-670