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Discussion Starter #1
I have a front wheel bearing problem, I try to find correct bearing part number, but I could not find which number of bearing is correct, some say nsk 6507 ddu, other say nsk 6509 ddu. Please help which one is correct? anyone point me to correct part list? Thank you to all.
 

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I have a front wheel bearing problem, I try to find correct bearing part number, but I could not find which number of bearing is correct, some say nsk 6507 ddu, other say nsk 6509 ddu. Please help which one is correct? anyone point me to correct part list? Thank you to all.
From what I see here this is the same as many other models... Someone may have then answer with a more usual reference than a MV one :smile2:

And from @Donsy post "All you need to know, and all we know", it seems that the right reference is 6005-2RS (25x47x12)

What is your mileage?
 

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From what I see here this is the same as many other models... Someone may have then answer with a more usual reference than a MV one :smile2:

And from @Donsy post "All you need to know, and all we know", it seems that the right reference is 6005-2RS (25x47x12)

What is your mileage?

if this is the same front wheel as my F3 800, then the number above is correct... just swapped in ceramic bearings!
 

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Discussion Starter #4
Thank you all for your kindness guiding.

I have done some search and find out, even many MV Agusta models pre 2010 use the same part number such as Turismo Veloce 2014 - 2016 use part number 800090355 and they call NSK ball bearing. Links is here MV Agusta Parramatta - MV Agusta NSK BEARING (800090355)

but other MV Agusta model use different part number 8A0026846 can be found on KTM part supply https://www.ktm-parts.com/8A0026846.html, Husvarna part supply website. But they call them Radial Ball Bearing

both part number above all refer to 6005-2ngk 6005-2rs or 6005-ddu, ...

But price is from very cheap to very high like factory oem or ceramic bearing or racing bearing or some brands. I choose NSK 6005-DDU made in Japan. Local store sell USD 2/each.
 

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Thank you all for your kindness guiding.

I have done some search and find out, even many MV Agusta models pre 2010 use the same part number such as Turismo Veloce 2014 - 2016 use part number 800090355 and they call NSK ball bearing. Links is here MV Agusta Parramatta - MV Agusta NSK BEARING (800090355)

but other MV Agusta model use different part number 8A0026846 can be found on KTM part supply https://www.ktm-parts.com/8A0026846.html, Husvarna part supply website. But they call them Radial Ball Bearing

both part number above all refer to 6005-2ngk 6005-2rs or 6005-ddu, ...

But price is from very cheap to very high like factory oem or ceramic bearing or racing bearing or some brands. I choose NSK 6005-DDU made in Japan. Local store sell USD 2/each.
Still curious about your mileage. Asking for this as it was notorious on some Ducati bikes that about a certain mileage, both bearing on front wheels would fail, as there was no protection from water projection... It's interesting to evaluate the requirements for change, to get ready.

At 2 USD each, it really makes sense to invest the money, have them ready somewhere with you when travelling with the bike, and being able to change those anywhere (had some fun in the past with Ducati riders, where the hammer was kind of old fashion tool (a stone) on the side of the road :grin2:)...
 

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Discussion Starter #6
Thanks Marc for helping out.

My bike just have 7000 miles, the symptom at first sight is your Tyre wear unevenly, very strange, then with front hard braking, you feel some vibration.. I thought, it was ABS working, but its vibration so strange that I try to shake, pump... the front wheels left, right all kinds. And finally come to conclusion, it is the bearing, very hard to notice it.

There is SKF 6005 2rs/c3 which is higher speed limit and loading rate, but it's made in China and cost around USD5/each. But I choose bearing made in Japan for some mind peace.

The factory design the best Bikes out there, but their QC quite bad, today is bearing, tomorrow is clutch, then signal light, then some sensors fail, or their suppliers did not get pay, so they provide all the crape parts.
 

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Thanks Marc for helping out.

My bike just have 7000 miles, the symptom at first sight is your Tyre wear unevenly, very strange, then with front hard braking, you feel some vibration.. I thought, it was ABS working, but its vibration so strange that I try to shake, pump... the front wheels left, right all kinds. And finally come to conclusion, it is the bearing, very hard to notice it.

There is SKF 6005 2rs/c3 which is higher speed limit and loading rate, but it's made in China and cost around USD5/each. But I choose bearing made in Japan for some mind peace.

The factory design the best Bikes out there, but their QC quite bad, today is bearing, tomorrow is clutch, then signal light, then some sensors fail, or their suppliers did not get pay, so they provide all the crape parts.
Well, other factors may chime in as well: Rare are those riding whatever the weather. And I'm not sure that "all weather riding" is part of the usual testing scheme from the factory. If you take the Ducati ST2, it was notorious that bearings doesn't like bad weather on the wheels. Some riders made addition of a planar joint to seal the bearing on each side of the wheel, with quite good results. I guessed Ducati learned of its past mistakes as I didn't heard about such issues on Mutistrada. And looking at the mileage of most of the MV Agusta I see used on the classified in France (which is one of the most active market in Europe), the TV/TVL are out of range in terms of annual mileage form the normal usage of a MV (others MV than TV are generally in less than 2000 km/year, while the TV/TVL is much more than this). That may also explain partially the thing. On such bike, and despite the Cagiva experience with Elefants, Gran Canyons and Navigtors, MV is still quite young, and some design elements may require improvement... And that may be also a valuable reason why we are all discussing here.

In fine, sealing activity may help, especially if riding conditions are close to sailing :grin2:
 

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Discussion Starter #8 (Edited)
Marc, could you elaborate how to seal the bike?, I use the bike for long distance and mostly in wet weather. Thanks

BTW, after changing the bearing, the oem bearing has no name, no serial...look very bad only after 7000miles.



Its also cost me a new Tyre replacement.

 

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Marc, could you elaborate how to seal the bike?, I use the bike for long distance and mostly in wet weather. Thanks
A friend had successful results on a Ducati ST2 by adding a simple plastic washer on each side of the wheel to cover the bearing. It reduce the exposition, and it is enough to maintain the grease in the bearing. It (more than) doubled the life of the front wheel bearing in his case.

Another wise advise from Ducatists (who had similar issues - may be because at that time the owner of Ducati was also Cagiva Spa, which became later MV Agusta Spa) is to have replacement bearing with you somewhere in the bike to be able to replace them when the first signs of wear appear.

BTW, after changing the bearing, the oem bearing has no name, no serial...look very bad only after 7000miles.



Its also cost me a new Tyre replacement.

You should consider yourself lucky somehow: discover the reason later would have probably cost you a wheel as well.

However, 7000 miles is very low. How do you clean your bike? Is there conditions which are so much different in your case justifying this level of wear?
 

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Discussion Starter #10
I will learn how to double seal the outer side of bearing. Thanks Marc.

But in my case, I think the factory some how install the bearing lead to side loading and only one bearing have a problem with side play. The other is normal.

I clean my bike very often and my wife jealously, why I don't clean her. ;-))
 

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I think the factory some how install the bearing lead to side loading and only one bearing have a problem with side play. The other is normal.
Maybe the original bearing wasn't seated properly? With the spacer (#3) there should be no appreciable side load on the bearings.

I clean my bike very often and my wife jealously, why I don't clean her. ;-))
I think we need to see photos to judge this... :grin2::wink2:
 

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Discussion Starter #12
Thanks Bumpkin for lighten me up, when I took out the wheel, still with the original bearing, the spacer not touching the bearing, some loose slightly there.

I thought its OK like that way. So when I put the new bearing in, I also leave slight gap with spacer. May be I need to reassembly the bearing and spacer again.
 

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According to the workshop manual (section F page 9) the spacer should have no axial free movement after the bearings have been seated and before the axle bolt is tightened to 60Nm. With a loose spacer it sounds like you're side loading the bearings once you tighten the axle bolt which isn't good.

If you haven't already, thanks to Donsy, you can get the manual from here.
 

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Also just had a front bearing go 'crunchy' feeling after 20,000. From memory no spacer between the fork and bearing like a quality Japanese bike. I guess its both exposed and cheap.
 
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