The spark plug gap for a 2000 Honda XR80R is .028", according to a major spark plug manufacturer (NGK).
A special 18 mm spark plug wrench. Use the Honda spark plug Wrench which comes with the standard tool kit below the seat. Use this and you will get all the plugs out easily.This 18 mm wrench is thinner and longer than a regular spark plug wrench. If the original wrench is no longer in your bike, you have to buy a new one.
most likely it will be a 5/8" spark plug socket.
18MM
The spark plug gap for a 2000 Honda XR70 should be set at .028 inches. A new spark plug can be purchased from an auto parts store already set.
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Simple, get a spark plug wrench an have a go at it. This can be done an about five minutes.
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0.04
To change the spark plug in your Honda 400 XR, first ensure the engine is cool and disconnect the spark plug wire. Use a socket wrench to remove the old spark plug by turning it counterclockwise. Inspect the new spark plug and gap it to the manufacturer's specifications if necessary, then install it by threading it in clockwise and tightening it securely. Finally, reconnect the spark plug wire, and your spark plug replacement is complete.
.035Answerhttp://www.championsparkplugs.com
a ngk CR7 HSA plug is what the manual lists.