Rear Sprocket bolt issues - MVAgusta.net
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post #1 of 17 (permalink) Old 09-10-2016, 09:06 AM Thread Starter
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Rear Sprocket bolt issues

Hi guys,

I was cleaning my chain and decided to remove the read sprocket to make sure I was cleaning the chain well.

I put everything back in place but when I started tightening the rear sprocket bolts, at 45 Nm as per the workshop manual, I never managed to reach 45 Nm and the pin basically snapped. I looked over and over the torque that I should have applied and it says indeed "45:50" (I understand this means between 45 and 50 Nm right?). I tried on another bolt but with another torque wrench that was clicking fine at 45 Nm on other bolts placed elsewhere on the bike. Despite this, exactly the same thing happened with the pin snapping again.

Would you have any idea what happened? Is 45 Nm the correct torque to use?

What is surprising is that it is the second time I do this sprocket removal thing and last time it was fine I remember.

Also, since getting parts from MV is often a pain, so you think these pin are standard and can be found at Honda or Yamaha? I am talking about reference 80A0A3248.

Thanks for your help guys.

Guillaume.
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post #2 of 17 (permalink) Old 09-10-2016, 10:32 AM
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Quote:
Originally Posted by gvanrenterghem View Post
Hi guys,

I was cleaning my chain and decided to remove the read sprocket to make sure I was cleaning the chain well.

I put everything back in place but when I started tightening the rear sprocket bolts, at 45 Nm as per the workshop manual, I never managed to reach 45 Nm and the pin basically snapped. I looked over and over the torque that I should have applied and it says indeed "45:50" (I understand this means between 45 and 50 Nm right?). I tried on another bolt but with another torque wrench that was clicking fine at 45 Nm on other bolts placed elsewhere on the bike. Despite this, exactly the same thing happened with the pin snapping again.

Would you have any idea what happened? Is 45 Nm the correct torque to use?

What is surprising is that it is the second time I do this sprocket removal thing and last time it was fine I remember.

Also, since getting parts from MV is often a pain, so you think these pin are standard and can be found at Honda or Yamaha? I am talking about reference 80A0A3248.

Thanks for your help guys.

Guillaume.

Very interesting Guillaume,

On earlier models 312 the manual torque figure was 25Nm with grease.
Your model is 45-50 as you suggest and that figure is without grease ie dry.

Now if you grease and apply 45Nm then you will stretch the bolt more than if it were dry.

Its quite a jump from 25 to 45 - 50 Nm though. I'm sure they have their reasons ?

If you need a set of pins let me know I have a spare sprocket carrier here.

but comm on [email protected] to help me

Joe
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post #3 of 17 (permalink) Old 09-10-2016, 10:39 AM
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If your bike is a 2010 or newer F4, the torque value for the rear sprocket bolts is 25nm

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post #4 of 17 (permalink) Old 09-10-2016, 10:40 AM
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Joe, where did you get that figure?

Name:  2010 F4 Torque Values.jpg
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post #5 of 17 (permalink) Old 09-10-2016, 10:48 AM
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Hi Chuck..
The 45 to 50 nm figure is from the MY 10 manual.

Im gonna recheck


Rechecked..

From MV Manuals :-

F41000R, 312R, F4 1078, 312RR ... figure is 25 Nm with specified grease

F4 1000R ( 2010 ) 45 - 50 Nm without grease

joe

Last edited by gotojoe; 09-10-2016 at 11:10 AM.
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post #6 of 17 (permalink) Old 09-10-2016, 10:49 AM Thread Starter
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Thanks to both, the value of 25Nm sounds more reasonable to me despite the workshop manual specifying 45-50Nm.

I think I basically messed up all of them by trying to torque them at more than 25Nm so will buy a full set of pins and bolts.

That being said, would you know if very standard motorbike makers like Honda, Yamaha etc (i.e. brands for which it is easy to get spares) have models of bikes with the same nuts and bolts as the F4 2010?

Guillaume
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post #7 of 17 (permalink) Old 09-10-2016, 10:55 AM
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Guilaume, those sprocket bolts can be bought from other vendors...even in exotic materials like titanium.

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post #8 of 17 (permalink) Old 09-10-2016, 11:12 AM
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Originally Posted by silentservice703 View Post
Guilaume, those sprocket bolts can be bought from other vendors...even in exotic materials like titanium.

I'd buy new ideally...

I'd have thought the part could be shared with Ducati or Aprila..Not so sure about Japanese but maybe ?

Did you use grease and 45 Nm Guillaume ?

Joe
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post #9 of 17 (permalink) Old 09-10-2016, 11:17 AM
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Joe, where did you get that figure?

Attachment 336194

Ooooh, I take your point Chuck..It says 45 - 50 in the rear wheel and suspension section and then 25 in the Torque settings section.

45 seems an awful lot

Joe
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post #10 of 17 (permalink) Old 09-10-2016, 11:17 AM
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What I can't believe is the manual says one thing in the body, and another, very different thing, in the specs.

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