The factory maintenance manual has an extensive section of tuning.  As the bikes are equipped with a reasonably sophisticated EFI system it requires good test equipment to achieve good results tuning these motors.  There are a number of sensors installed that feed information into the control unit and these require accurate setup to function correctly and feed information into the Weber Marelli Engine Control Unit (ECU) located under the rear seat.  I'd recommend that anyone who wants to tune one of these machines themselves get hold of a copy of the excellent workshop manual.  One warning, though - you'll need access to test equipment before you can make use of all the information contained in the manual.  The same ECU is used in various Ducati models, as well as some Moto Guzzis, so your local dealer in either of these brands is likely to have the right sort of equipment to perform a thorough tune, based on the information in the Workshop manual.

One interesting point - the engine is tuned lean to pass various emission regulations, as reflected by a low CO reading as set at the factory.  The manual suggests that a better setting for 'performance' reasons is a bit richer, ie a higher CO level.  It is possible that your dealer may have already seen and followed this suggestion, but it could be worth checking, especially as a lean running motor is a hotter running motor, and heat can certainly be an issue with these motors.

Tuning definitely can make a difference - for instance, my bike ran more smoothly and with much less vibration after a decent tuneup, even though the previous tune had been done by the same mechanic on the same equipment!


© Steve Carr, 2001-2007

Site created February, 2000.  Last modified Friday, May 15, 2009

Return to 668 Tech start page

Last updated
30 May 2005