Ducati Monster Forum

Moto Board => Tech => Topic started by: leungevity on July 16, 2013, 07:39:23 AM

Title: torque specs for sprockets
Post by: leungevity on July 16, 2013, 07:39:23 AM
Hi all,

I'm changing the sprockets on my 03 m800 sie, and was wondering if anybody can provide the torque specs for the bolts that attach the sprocket to the rear wheel and the 2 bolts that attach the front sprocket.  I've seen torque values for other models, but not sure if they translate to my bike.

any other important torque specs would be appreciated as well. (axle, brake caliper, etc)

Thanks in advance!

found this, not sure how applicable it is though.
http://ducatimonsterforum.org/index.php?topic=373.msg0#new (http://ducatimonsterforum.org/index.php?topic=373.msg0#new)
Title: Re: torque specs for sprockets
Post by: leungevity on July 16, 2013, 10:16:08 AM
well hopefully this works out... i torqued the front sprocket to 4 lb-ft with some blue loctite...

still trying to gain some concensus for rear sprocket torque specs and rear axle, leaning towards about 35 for the sprocket and close to 60-70 for the rear axle. 

anybody care to tell me if i'm close?

thanks
Title: Re: torque specs for sprockets
Post by: Slide Panda on July 16, 2013, 10:24:41 AM
http://www.ducatimonsterforum.org/index.php?topic=373.0 (http://www.ducatimonsterforum.org/index.php?topic=373.0)

For my m 900, rear axle is 72 Nm
Title: Re: torque specs for sprockets
Post by: leungevity on July 16, 2013, 10:56:23 AM
thanks, guess i'll go with that number.

funny, when i ordered my sprockets from Ca-cycleworks, i told them to just give me the stock sprockets and as it turns out, my bike had the 14t front already done, but i received a 15t from the shop.  guess i'll get better fuel economy :)
Title: Re: torque specs for sprockets
Post by: Howie on July 16, 2013, 12:10:38 PM
The rear sprocket is 46 Nm., blue loctite.
Title: Re: torque specs for sprockets
Post by: krista on July 16, 2013, 11:03:45 PM
Also, best to isolate the torque on the pins: put a hex key into the back of them then clamp the key in a vice. THEN torque the nuts.

The two tiny screws (M5?) on the sprocket get 60 in-lb (if they're M5). That's about HALF what a t-handle can do in the average dude's hand.
Title: Re: torque specs for sprockets
Post by: leungevity on July 17, 2013, 10:11:11 AM
thanks for the help! 

so i thought i was SOL on the master link, since it's a rivet instead of a c-clip, but turns out a friend had the riveter tool.  SAVED!

until i went to put the chain on, and found out that the unexpected 15t front sprocket screwed up the chain length we already cut (in reference to the 14t chain)

might have to buy a 14t front sprocket so i don't have to get another chain.
Title: Re: torque specs for sprockets
Post by: Howie on July 17, 2013, 10:33:16 AM
Another option is add another master link.
Title: Re: torque specs for sprockets
Post by: leungevity on July 17, 2013, 10:50:11 AM
:D  yea, that's the other option we're pursuing... seems like that might be the way to go, since a master link is cheaper than a sprocket :)
Title: Re: torque specs for sprockets
Post by: ellingly on July 17, 2013, 03:44:09 PM
Wouldn't you need to add more than just another master link? After all, you are joining two inners and losing an outer to put another master on.

1 tooth on the front is half a link worth of extra chain needed, at most. So the chain is wrong even with the axle all the way forwards?
Title: Re: torque specs for sprockets
Post by: brad black on July 18, 2013, 02:53:45 AM
Quote from: chris on July 16, 2013, 11:03:45 PM
Also, best to isolate the torque on the pins: put a hex key into the back of them then clamp the key in a vice. THEN torque the nuts.

check the pins are tight too.  I always do the above, but use a tyre lever b/w pins to turn the cush drive around the pin to make sure it's tight, then tighten the nut.  some are really loose.

14mm nut pins usually go ccw, 15mm nut pins go cw. 
Title: Re: torque specs for sprockets
Post by: leungevity on July 18, 2013, 01:01:25 PM
so here is something i learned... when pressing the master link together, use a socket wrench with a 14mm socket to turn the press, instead of the tiny little lollipop stick they give you.
Title: Re: torque specs for sprockets
Post by: leungevity on July 23, 2013, 05:58:27 AM
thanks for the help everybody, the chain went back together yesterday and i actually prefer the 15t front sprocket to the 14t.  it just feels smoother to me