Author Topic: Torque values in the manual.  (Read 1161 times)

FreepZ

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Torque values in the manual.
« on: February 23, 2013, 11:34:23 PM »
The manual has a bunch of torque values for lots of the nuts and screws on the bike, but many of the descriptions are a quite cryptic.

E.g. Any clue what a this is:
ASSY, SUBFRAME, INST - M6X1, NY, 10, ZC

Whatever that is, it should be tightened to 8.9 Nm!

There's probably a system there. The only bolt that I have a clue about is this one:

ASSY, SWINGARM - M18X1.5, NY, 8, ZC - 55 Nm
That might be the axle nut, which needs to be torqued to 55 Nm
Richard #935 #595 #44

Richard230

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Re: Torque values in the manual.
« Reply #1 on: February 24, 2013, 09:52:29 AM »
55 NM is kind of low for a rear axle nut.  100 NM is more typical.  As an example, my Aprilia RS50 specified that its rear axle bolt be tightened to 100 NM, as does my Yamaha FZ1.  Front axle bolts seem to run around 60 to 80 NM, in my experience.

My guess is that torque value is for the swing arm bolt.

I have no clue what the subframe bolt might be.
current bikes: 2018 16.6 kWh Zero S, 2011 Royal Enfield Bullet 500 Classic, 2009 BMW F650GS, 2007 BMW R1200R, 2005 Triumph T-100 Bonneville, 2002 Yamaha FZ1 and a 1978 Honda Kick 'N Go Senior.

FreepZ

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Re: Torque values in the manual.
« Reply #2 on: February 24, 2013, 11:40:07 AM »
55 Nm is the only torque value that is clearly described in the manual, and unless I misread, the manual says that value is for the axle nut. I know that the manual is still provisional, but I hope that the numbers that are there are accurate.

I guess I'll wait for somebody to adjust their chain and learn from their experience.
Richard #935 #595 #44

Richard230

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Re: Torque values in the manual.
« Reply #3 on: February 24, 2013, 06:53:21 PM »
If the Empulse uses a name-brand O-ring chain (unlike the CZ chain that came on my F650GS, which only lasted 18k miles before it spit out all of its O-rings), it could be a while before you need to adjust it.  My FZ1 uses a 525 DID chain. It has 26K miles on the clock and I have not yet needed to adjust it (other than when changing rear tires).  A similar chain on my CB750 Nighthawk lasted for 35,000 miles before I sold the bike and it still seemed in good condition and I also didn't need to adjust the slack between tire changes. My guess is that you will be replacing the rear tire before you need to adjust the chain - unless the Empulse is a lot tougher on chains than most IC motorcycles - which seems doubtful.
current bikes: 2018 16.6 kWh Zero S, 2011 Royal Enfield Bullet 500 Classic, 2009 BMW F650GS, 2007 BMW R1200R, 2005 Triumph T-100 Bonneville, 2002 Yamaha FZ1 and a 1978 Honda Kick 'N Go Senior.

BrammoService

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Re: Torque values in the manual.
« Reply #4 on: March 06, 2013, 01:02:44 PM »
55Nm rear axle torque is based on the materials used, third part durability testing and thousands of engineering test miles. Between our testing and the third party testing we have seen no evidence of this value being too light. Feel free to adjust your chain and torque that rear axle to 55Nm with confidence.
Adam