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916 Belts Running Close

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

  1. s-l400.jpg
    The cover plate between the cams on the Testerbassa has 5 bolts, on the normal head it has 4 bolts.
     
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  2. Head lower at exhaust side to make engine shorter to give more front wheel clearance as can get very close under braking on some models.
     
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  3. They had to make room for the suspension points on the monster and ST frames to avoid retooling ;o) Original head design wouldn't fit.
     
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  4. So is 110Hz +/-5 the correct tension there’s a lot of different info out there 953F17CA-455E-4DFD-BFC1-6536615D6B29.png
     
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  5. I think Exact Fit belts are slightly different but that info will come with the belts, 110 Hz for OEM Ducati belts :upyeah:
     
  6. I can’t recall the number, but I set a 916 up with the old deflection tool, then measured with the frequency tool, and it wasn’t 110hz. Next time I do one, I’ll check again.
    I don’t use frequency setting for any of the older bikes.
     
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  7. Jezz nelly you’ve just thrown a spanner in there. And I was in the middle of putting her together to start on my defender turbo.
     
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  8. I’m not saying don’t do it, just that there’s a lot of info come out in this thread, and it just seems to be getting bogged down. I personally think that originally the belts were over tensioned. I’m not convinced with the Allen key method if I’m honest, and the guy who did the video still suggests getting them checked?.....
    That tech bulletin is quite old, and when it came out I checked my own practices and wasn’t convinced. I’m fortunate to have the tools, and prefer to still use the relevant tool for the period of bike I’m working on. I still use a spring balance for Pantah.............
    Thing is, this has been done to death over the years and everyone will have their own idea or method, and most will work just fine.
    Slack is better than tight, so use a little judgement. Remember, the tension is not so much about jumping teeth, it’s also about allowing for expansion as the motor gets hot and the belt not going tight.
     
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  9. Yes indeed, 99Hz when new.
     
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  10. That's a different picture to before ;)....….….….….….…...:eyes:

    748 5 Bolt Side Covers - TBST4.jpg
     
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  11. Yes, and the belts are 2 teeth shorter to compensate. The pulleys are the same.
     
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  12. Thanks to one of my old zuki tools and the gates carbon app I’m sorted I hope and all tensioned to 99hz 4E633728-0948-47E2-BD7F-DC7B6686FDA0.jpeg
     
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  13. F8073122-2015-4E32-B81A-B21D2F5EBFD0.jpeg Mine have always been this close hope it’s ok
     
  14. Just done mine ,they are way too close(748sps 853)
    Ebay ducati belts ( ducatimono)
    95t anti clockwise on eccentric ( you can go over lobe of eccentric!!)
    Old belts were 95t
    Doesn't take much of an error of say 0.080 over 95 teeth to make them alot closer
    Have ordered exact fit

    20240101_185520.jpg

    20240101_185602.jpg

    20231219_171318.jpg
     
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  15. Have a look at this clip from 17:30 which talks about belt tensioning.

    https://www.ducatiforum.co.uk/threads/baron’s-916sps-at-luigi-moto.97476/
     
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