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The forum gossip 2) is the nearest - the Ducati Manual is wrong and here is the wording of a Service Bulletin to correct it. I've got a M1000 and have put two sets of belts on using the 45 deg twist method - it's done about 30k miles ok. The tension is not that critical although can be too tight or too loose. The 160Hz in the manual would be too tight and give the bearings a problem.
Sonic Belt Tension - Ducati update
The following service bulletin has been issued by Ducati North America. Note that the specs are now the same for all models 2V and 4V. There are a few omissions from the list - 748 and ST4s, but I would think that's just an oversight.
All previous and new model Ducatis requiring belt tensioning now will be standardized to the below specifications.
IMPORTANT: When checking and adjusting timing belt tension at the recommended scheduled maintenance intervals, if tension reading is less than 70 Hz (minimum allowed value on all Ducati motorcycles), reset belt tension as follows:
Refer to the appropriate shop manuals for cam timing procedure and belt tension setup, then reset to the below tensions for service.
Model
Belt tension spec for new belts upon replacement
Belt tension adjustment settings for used belts when inspected value is determined to be 70 Hz or less
All models:
Streetfighter, 1198, 1098, 1098R 999, 998, 996, 916, 848, 749, M1100, MS4, MS4R, MS4RS, ST4, SC, ST3, ST2, SS1000 HYM 1100, MTS 1100,MTS 1000, MS2R 1000, M696, MS2R 800, M620, M400, M695, SS800, MTS 620
New Belts:
110 Hz +/- 5, Horizontal and Vertical *
Used Belts:
90-100 Hz +/- 5, Horizontal and Vertical *
* Please note, these values may be inaccurate on previous Ducati Technical Data posters and service manuals. Data listed above should be considered the new standard and supersedes all previous bulletins and documentation. Please print and post this bulletin to be displayed with the most current Ducati service poster.
Sincerely,
Ducati North America
Service Department
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