Belt Adjustment: Questions Answered... - Page 5 - Ducati.ms - The Ultimate Ducati Forum
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post #41 of 69 (permalink) Old Nov 22nd, 2008, 12:16 pm Thread Starter
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Originally Posted by mig1221 View Post
The belts are surprisingly loose when correct.
Yep, they are pretty loose... But don't forget, the numbers above are for the 748R, which is 85hz/75hz. The real numbers are 110hz on both... so just be mindful of that. My intention was on how to do the process, not give numbers.



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post #42 of 69 (permalink) Old Nov 24th, 2008, 8:42 am
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More on belt tension

Forgive me if this has been well addressed but I have spent a few hours searching the forum and did not find what I was looking for. Following is a photo of the tool I have been using for the past 8 years on my Desmo's with good success but I am now thinking that the frequency method is more precise and desirable. I have not done any of the work so far on my 999, but I plan to start. I gather from the forum that this tool will not work for that bike, correct?

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post #43 of 69 (permalink) Old Nov 24th, 2008, 12:50 pm Thread Starter
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The pressure tensioner tool won't work with the newer bikes. They want the frequency set perfectly, because of the timing differences when the belts get tighter and looser.



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post #44 of 69 (permalink) Old Nov 24th, 2008, 12:53 pm
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Originally Posted by tye1138 View Post
The pressure tensioner tool won't work with the newer bikes. They want the frequency set perfectly, because of the timing differences when the belts get tighter and looser.
Actually, that is not the reason. Simply, it won't fit.

Frequency is no more accurate, it is simply easier to measure in a confined space.

Belt tension is belt tension, how it is determined is irrelevant.

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post #45 of 69 (permalink) Old Nov 24th, 2008, 1:02 pm Thread Starter
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There are many reasons why they switched systems. From my readings, they moved to a laser based reader because of accuracy and simplicity. They could have easily made a mechanical tool that did the same thing and fit on the testastretta's, but they didn't. The mechanical way of measuring doesn't give you nearly the accuracy. I've used one several times and compared it to the frequency method and its WAY off.



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post #46 of 69 (permalink) Old Nov 24th, 2008, 1:52 pm
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I cannot empirically vouch for the accuracy of any method but I will say that using the tension guage that I posted a picture of is a fussy process. It takes me a few tries until I feel comfortable with the result. Moving things just a wee bit when you are tightening makes the guage swing wildly and the result of 4 or 5 tries always seems just a bit different in terms of final position of componets with the guage reading appropriatly. I dunno, I've never broken a belt and the guage is super quick to set-up and use but it does not sound as precise as what has been described here.

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post #47 of 69 (permalink) Old Oct 27th, 2009, 8:02 am
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Just done a PRECISE valve adjustment on the 1098 - thanks Mike at EMS. Also wanted to adjust belt tension by the audio frequency method, but NO GO.
I downloaded two lots of software (shareware?) and bought the latest 'directional' mike from Logitech, with a USB connector, but could get no meaningful reading either from my belts or a guitar. Now I'm being told I may need a pre-amp (which I thought was the object in the early post) starting at $200, pay for a soundcard (better than in my new Dell Inspiron laptop) etc.
Surely I can buy a straight Audio Frequency Meter as a stand-alone instrument for this much?
Anyone care to take us through EXACTLY how you achieved the desired readings with the PC + mike method, as I have spent a lot of time (and now own a flash mike which is looking like it might be useless) and am about to head to Phillip Is. for trackdays with belts set by the old 'feel' method...
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post #48 of 69 (permalink) Old Oct 27th, 2009, 8:03 am
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Why not just get a $20 instrument tuner from your local band store?

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post #49 of 69 (permalink) Old Oct 27th, 2009, 10:17 am Thread Starter
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I currently use a cheap USB powered mic and the free software. Takes roughly 10 minutes to do the calibration because it takes time for the mic to pick up the soft signals.

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Why not just get a $20 instrument tuner from your local band store?
Because most tuners need a much louder signal to read. You need something that will pick up the quietness of a belt pluck. Someone did find a tuner that will work, but they never posted in this thread.



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post #50 of 69 (permalink) Old Oct 27th, 2009, 10:26 am
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Because most tuners need a much louder signal to read. You need something that will pick up the quietness of a belt pluck. Someone did find a tuner that will work, but they never posted in this thread.
I never had issues with the tuners that I used to use...same ones I used as a musician, either buy Korg, Seiko, BOSS, Yamaha, etc. They all have mic plug-in's also, so that would definitely help. I use a Korg tuner that works perfectly.

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