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916 Belts Running Close

Discussion in 'Technical Help' started by Davyd, May 23, 2020.

  1. Did you turn the engine so horizontal was TDC when setting the tension?
     
  2. I was long sceptical of the phone app setting thinking that it might be too variable but, for the first time this year tried it out.

    I set the 916 tension by my usual method (Facom belt gauge) and then checked it with the phone app and I was impressed with how accurate and repeatable it appears to be.

    Did the same with the Monster belts (Facom gauge unfortunately doesn't fit) using the old school go/no go allen key method and, again the app appears to confirm the settings and also highly repeatable.

    I will definitely be using it in the future, along with the mechanical methods as a belt & braces approach.
     
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  3. Well glad I checked C7F85AE6-C81E-41C0-BDDB-82551C876F39.jpeg
     
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  4. Yes I did
     
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  5. And I thought mine were close. Are they also new Ducati belts?
     
  6. Yup luckily I’ve only started it up once :bucktooth: rechecking them now
     
  7. I’ve tried every which way to tension the horizontal belt, no joy always too close
    Vertical looks fine, may swap them over just to see if it’s me or the belts
     
  8. I’d be interested to know as I was going to do the same.
     
  9. I’ll do it tomorrow, see what happens never had a problem in the past. I’ve ordered some new belts too
    The texture of the new belts seems different to the ones that came off but they weren’t Ducati belts,
    But sure have the previous belts that were Ducati belts,will dig them out and compare
     
  10. Very nearly , it’s a poor pic But disaster averted thanks to this thread :beer:
     
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  11. Well swopped horizontal belt to vertical, tensioned with facom and 5mm test a little better 335412B6-4E41-42C5-A07C-BC8392DE1712.jpeg 335412B6-4E41-42C5-A07C-BC8392DE1712.jpeg 2FA7C304-1F92-407D-9558-D72B4360B029.jpeg
     
  12. So I suppose the question is How close is to close?
     
  13. Difficult to measure but horizontal 3mm vertical 4mm clearance
    I’ve dug some old belts out All low miles. genuine 2015ish
    Exact fitt 2018 ish
    They all measure the same give or take a few hundredths of a mill
    But the new genuine belts feel and look different
     
  14. Here’s my 1098 horizontal cylinder belt for comparison. Obviously not the same bike but belts have plenty of spacing.

    258D77C2-B480-45F9-B93E-0487AD09D535.jpeg
    .
     
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  15. Here’s mine 998s horizontal.

    32D1A945-D906-4BFD-B13E-6EB709F6DB72.jpeg
     
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  16. What’s it like when tensioned using the other side of the eccentric ?
     
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  17. Makes no difference as far as I can see
     
  18. It’s usually noticeable , from memory turning the eccentric one way (CW?) puts the belts closer ,turning the other way (A-CW? ) puts the belts further apart .
     
    #39 m@tt, May 25, 2020
    Last edited: May 25, 2020
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  19. And those gold (996) idler pulleys are a couple of mm bigger than the black (916), so give better distancing.

    They're what I used on my 916 to compensate for the skim/squish.
     
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