I also agree with the opinion that the manual indicates an excessively strong tension of the drive belt. I do less than indicated in the manual. But I can’t say anything instrumentally, although I have a tensometer. I used to use a strongly sagging belt, so much so that I could feel the slaps of its tension during acceleration. Unpleasant, but not fatal. But when the belt was pulled as said in manual, I noticed tangible wear on the driven pulley in just 8 thousand kilometers. Moreover, such a tension of the belt contributes to the damage of the bearings of the wheel axis and the middle gear.
In general, I look at the manual, take a tensometer and do a little less)))
Burn the Guzzolene!
Burn the tires!
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