UK Monster Owners Club Forum » .: Technical :. » Engines, Clutch, Gears » Front sprocket nut

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Old 12-12-2019, 10:19 PM   #1
Ron1000
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Front sprocket nut

Guys,
I’ve got my front sprocket nut listed at 186nm tightening. Anybody know if that’s correct. Seems awfully awfully tight.
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Old 12-12-2019, 11:18 PM   #2
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I have just had a look at the list of settings I got from Luddite and indeed is 186nm. When I swapped front sprocket for 14t it was a pig to get off. Was a compressor and impact gun job. Tried it with the old two men one on the bike the other with a breaker bar and it wouldn't budge. Seems daft when there is a tab washer to stop it moving that the setting is so high. My torque wrench does 150 so it went back at that
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Old 13-12-2019, 08:08 AM   #3
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Talking

Cheers Rawlings. Yeah. I’ve got a torque wrench up to 220nm so might as well do it.
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Old 13-12-2019, 01:12 PM   #4
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make sure you put some copperslip on the threads.
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Old 13-12-2019, 02:05 PM   #5
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Will do Chris
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Old 15-12-2019, 02:10 PM   #6
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I suppose its called the Jeezus nut for a reason! Seems a bit excessive though if you have a tab washer and less torque in the engine to undo it? 748/916 wheel nut is the same silly spec, c-clipped and lockwired too but its reassuring as you do actually need the rear wheel to stay on!
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Old 15-12-2019, 02:45 PM   #7
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Put it on yesterday, couldn’t actually get it to 186nm. Between the chain ‘stretch’ and the back brake no holding it. I only got to 160nm, it’s got a lock tab anyway so it’s definitely not moving.
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Old 15-12-2019, 06:58 PM   #8
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I remember changing chain and sprockets on my 1050 Sprint St when I tapped the washer flat the front sprocket nut wasn’t anything but finger tight and I did several thousand miles unaware of it!
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Old 13-01-2020, 03:28 PM   #9
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Do people actually use torque wrenches? I own one but I can't remember ever using it. I tend to tighten everything until I make an involuntary 'old man noise' and leave it at that. I havent had anything fall off a bike yet.

** To clarify, 'old man noise' is similar to the noise you make getitng up off the sofa if you are over 45 **
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Old 13-01-2020, 04:12 PM   #10
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I have two, which I use, but not every time.

There's a Halfords 8-60 Nm, which is good for 95% of the fasteners on the Evo, and an unbranded 28-210 Nm, which only comes out for the rear wheel and sprocket nut.

Being paranoid about stripping a thread, I'll always use one if it's a steel screw into aluminium - crankcases for example. Also, if it's a critical fastener, such as disc rotor and caliper bolts or yoke pinch bolts. Oh, and the single-sided swinging arm pinch bolts too, as it's notoriously easy to damage the eccentric hub if you overtighten them.

(I still make the old man noise though!)
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Old 13-01-2020, 05:22 PM   #11
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I have three 1/4”, 3/8” and 1/2”. That covers everything I’ve ever come across. I use them very regular, just not on say minor stuff bolts for carbon fibre or that.

But The ‘dog tight’ method has got me in trouble before so I tend to avoid it.
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Old 13-01-2020, 05:52 PM   #12
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Just did mine up as tight as I could, it hasn't moved.
Some stuff that might distort like heads I go for the speced values
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Old 13-01-2020, 10:37 PM   #13
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Quote:
Originally Posted by Luddite View Post
Being paranoid about stripping a thread, I'll always use one if it's a steel screw into aluminium - crankcases for example.
That's just where I'm less likely to use one to be honest as I've known too many people strip out the thread where it has given up before reaching the torque so I tend to go by feel- especially on my old race bike.

Quote:
Originally Posted by Luddite View Post
Also, if it's a critical fastener, such as disc rotor and caliper bolts or yoke pinch bolts. Oh, and the single-sided swinging arm pinch bolts too, as it's notoriously easy to damage the eccentric hub if you overtighten them.
I do use them for those kind of applications though and axle bolts of course.

I bought my Draper torque wrenches as a deal through college when I did my City and Guilds about 20 years ago- the fact they're still available and reasonably priced must say something. I even checked them at work recently and they're still calibrated fine too.

https://www.ebay.co.uk/itm/DRAPER-1-...MAAOSwImRYLd98

https://www.ebay.co.uk/itm/DRAPER-3-...kAAOSwVupTosEP
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Old 14-01-2020, 04:00 AM   #14
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i use my 1/2''and 3/8'' a lot the 1/4 one less often i have 3 teng ones and 3 other brand ones
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Old 14-01-2020, 08:26 AM   #15
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Quote:
Originally Posted by jerry View Post
i use my 1/2''and 3/8'' a lot the 1/4 one less often i have 3 teng ones and 3 other brand ones
Are torque wrenches the new bins? We need photo’s!
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