Bottom yoke fork clamps torque (Rieju RS3 125, guess)?

[Riejufixing]

Bottom yoke is light alloy, most graceful construction, clamped by two M6 coarse Allen bolts (4x diameter thread length!!). Forks are 55mm diameter at that point.

Any ideas about torque settings? I'm trying to get a workshop manual, but it could be a while, or never.

[Fizzer Thou]

If the lower fork clamps are cast then,as the standard clamps on my KTM are,then they are listed as 15nm.

But I have some aftermarket top and lower fork clamps fitted which are CNC machined and they have engraved on them that the tightening torque is lower at 12nm.

Do not forget that if you tighten the lower clamp too much then that can not only affect the fork operation but can also cause the clamp to shear off.

It is a good idea to use blue Loctite on the threads.This stops corrosion of the steel bolt in the alloy casting
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[Riejufixing]

[Fisty]

Do you have any mechanical sympathy?
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TL1000R | Hayabusa | ZXR400 | TL1000S | Bandit 400 V
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[Riejufixing]

[stinkwheel]

Odd set screws, I'd have expected a plain shoulder on them...

However, the limiting factor is the grade of steel the screws are made of. That determines the stretch required to keep them in place. So do they have any markings on the heads?

I can't tell from the picture but if there is any logic, they are made from BZP, 8,8 mild steel. In which case you should do them up to 10Nm according to a standard engineering torque table. Reduce that to 9Nm if they are greased.

If, however, they were made of A2 stainless (an ill-advised material to screw into alloy and I would use loads of copper grease if they are) I would go with 7Nm.

As above, use your head and your hand, don't rely on a torque wrench which is only good for telling you when they are tight enough. It can't tell you a fastener is too tight if it starts to stretch prematurely.

In any case, a stripped thread can be easily repaired and was probably indicating it was knackered anyway. A broken bolt is much harder to deal with.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Fizzer Thou]

[Riejufixing]

[Riejufixing]