Hi Harry. My dealer told me that this is product of the general setup of the injection. Below exactly 80 degrees centigrade and 3000 rpm the rear cylinder is switched to "half" its normal operation. Apparently this is to keep the rear cylinder from burning itself out. I have been told that that was a problem with the 2000 version, and that this is the solution of that problem in the 2001 version. It may be so that later versions have different solutions, in which case you could consider a more recent injection control unit (expensive!). Otherwise keep your eyes on the temperature and the rev counter. 
We invite you to introduce yourself by a few sentences if you are new to
this discussion group. Enter your e-mail to join the forum and get notifcations on new messages. Or post your question,
answer or comment as a guest. We have just improved this discussion forum and expect the number of users to increase.
More 2001 Cagiva Navigator information
Our discussion groups are intended for short messages. We also welcome more extensive motorcycle reviews.
Bikez also recommends that you check out the technical
data and the riders' rating for the 01 Cagiva Navigator.
You can also rate it yourself. Use our efficient motorcycle
classifieds to sell or
buy
this bike. Your motorbike gets a high quality presentation. Ads are free.