Sophomore Rider
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Posts: 128
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Joined: Jun 1, 2013 5:11:09 GMT -5
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Post by gingel on Aug 20, 2016 4:10:15 GMT -5
Hi,
I have a 125cc SYM scooter, and in the service manual it says that the torque for the Front wheel nut is 11-13 kgf-m (around 107-127 Nm).
That seems a lot, and i also ask a mechanic which said it's too much.
The mechanic said that 50 Nm ( around 5 kgf-m) is enough.
I dont know if it matter, but my scooter has a Front Drum brake.
What torque do you use for the Front wheel nut?
Thank you.
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Post by hillbillybob on Aug 20, 2016 6:26:38 GMT -5
According to a generic GY6 service manual, (of which there are many available to download) the front axle nut should be torqued from 5.0 - 7.0 kg/m, or 35 - 40 ft/lbs.......that's pretty close to what your mechanic told you.

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Sophomore Rider
Currently Offline
Posts: 128
Likes: 3
Joined: Jun 1, 2013 5:11:09 GMT -5
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Post by gingel on Aug 20, 2016 7:54:13 GMT -5
so SYM is something special, or maybe the service manual that i have is wrong?
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Post by hillbillybob on Aug 20, 2016 16:46:48 GMT -5
I have no idea if your Sym is something special......but torque values are determined by bolt/nut thread diameter, thread pitch, bolt material/hardness, dry or lubricated, etc, etc. I linked this chart to another forum, for one of it's members with a torque question.......thought I'd link it here too. Might be useful to keep a copy of it for future reference. Metric FastenerTorque Chart |
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Post by lain on Aug 20, 2016 18:00:03 GMT -5
I've never torqued the front wheel, I put the nut on hand tight, literally no tools just use my hand and a drop of removable loctite. Never have had an issue with a nut loosening up even without using loctite and just tightening it by hand.
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Post by crawford on Aug 20, 2016 23:11:57 GMT -5
I looked at chart if you use it you can't be wrong go for it if you need to use torque wrench but I too have not used it on said piece but then I have been wrenching 50 years.
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Post by lain on Aug 21, 2016 6:00:05 GMT -5
I looked at chart if you use it you can't be wrong go for it if you need to use torque wrench but I too have not used it on said piece but then I have been wrenching 50 years. I'm not nearly experienced, but I realized the nut is not likely to fall off easily even when not screwed in when I discovered one of my fiends front wheel nut was never screwed back on when he replaced his front wheel and he had been riding around for weeks with no nut on the front axle. All I could say when I found out was "that is nuts." you know... the lack of a nut... hahah puns. |
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