Ignitor problem

A number of new-gen ninjette owners have experienced a strange problem that seems to be related to the CDI box, which is what controls the spark timing (among other things) for our engine to run properly. In a nutshell, when the CDI gets hot it sometimes misbehaves. Symptoms vary, but on many bikes with this issue the tach starts to behave strangely, bouncing around in the 7500 - 9000 range when the engine isn't moving as it represents. On other bikes the tach seems to read 1000 rpm higher when hot compared to cold, even when the bike is going the exact same speed as it was earlier. Some people report poor fuel economy.

The problem is that Kawasaki hasn't released an updated part or a guaranteed fix for the problem, the way it is usually dealt with is by replacing the CDI and/or the tach with the exact same part number, and hope that the 2nd one doesn't have the issue. In some cases it fixes it, but in some cases people are on their 2nd and 3rd CDI's and are still experiencing it. Hopefully Kawasaki will eventually get a more foolproof fix into the pipeline, but in the meantime this is one annoyance that if you do suffer from may continue to be an annoying problem to deal with.

Links:

Relevant link - Post #4 in that thread has the most complete explanation