I've always tensioned belts using mechanical means; I have a Facom tensioner for the 916 but it won't fit the Monster as there isn't space to get it in, so I've used the go/no-go allen key method which IMO is a little subjective but I really don't think the tension is that critical (and better a tad loose than tight).
This year I changed belts on both bikes and used the Exact fit for the first time (always used Ducati belts until now). I have to say they seem fine and are significantly cheaper than the OEM.
I also tried the gates app on my phone, about which I was a bit dubious but have to say that it seemed very good with the frequency confirming that my old-school methods were pretty much spot-on and it seemed very repeatable.
I got the odd 'fake' reading if holding/twanging differently but overall I was quite impressed and will definitely use it again along with the mechanical tests.
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M900, 916, LeMans II.
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