Will changing spark plugs cure a misfire?

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Q. My Ducati 900SS has a misfire which starts after I have ridden a few miles. Will changing the plugs sort it out?
George Booth, email
 
A. A misfire is either related to the fuelling or the ignition, so you do need to start with the plugs. But instead of just changing them, get hold of a spare set and the tools to replace them when you go out next.

As soon as the misfire starts check the plugs. If they are black or sooty, there is a problem with the fuel/air mix such as the choke sticking on. If the plugs are wet, there may be a problem with the electrics.

Fit the new pair of plugs when you check the old ones. If the bike runs fine, suspect the ignition and get it tested thoroughly.

MCN

By MCN

The voice of motorcycling since 1955