Just fitted a front engine mounting billet bracket to my 2001 Cyclone, new bolts tighten to 100 Ibft as per the manual (thread lock, and oil on the shanks).
Went for a quick blast around the block. When I got back I noticed that one of the bolts had lost its head.....
Did I do something wrong? Is this a common occurrence?

Proper bolts , yes?

Oh yes....AA0722.1CBZ genuine bolts - not cheap!

Are the isolators all good?

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Last year I joined a group for anti-social people
We haven't met yet.

New ones fitted at the start of the summert - front and back

I feel your pain!
Nothing worse than knowing you've done the job properly, not taken shortcuts nor made compromises, and yet it still goes wrong.

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'98 M2 Razorback, it's a keeper.

Maybe just a bad bolt. I'll fit a new one - once I've worked out how to get the snapped off one out.....can't remove the bracket 'cos the frame's in the way

Correct torque is 60 ftlb.......back out a couple of turns, then back to 60ftlb.

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Mithered ta death.
92 MB
96 S2T
98 S1W
00 M2
01 X1
03 P3
10 CR

Thanks Maz, that would explain the failure.

There might be a little more to this failure mechanism.......eh .....

Yes....thanks Jez .......waiting on a written report from the lab before I can get a reaction from H-D but not holding my breath re. a favourable outcome
.....and the fact that Tinks over torqued the fasteners doesn't help much

_________________
Mithered ta death.
92 MB
96 S2T
98 S1W
00 M2
01 X1
03 P3
10 CR

Yes, my fault, but it does undermine trust in the manuals content.
I wonder what else is bollocks?

Buell workshop manuals are full of incorrect data and omissions, some of which date back to various recalls, misprints and general oversights, etc.
In your case, I suspect you read NM instead of ftlbs ?

_________________
Mithered ta death.
92 MB
96 S2T
98 S1W
00 M2
01 X1
03 P3
10 CR

I'll do some nagging next week re: a report.

Just checked the manual again. Definately says 100 Ibft - lying gifts!