cyl stud pulled out

[Guest]

I re-torqued my 1166 cylinder head when i rebuild it and then rode it for a few 100 miles and then took the head off to re-torque when and found that the very front left cylinder stud (if sitting on bike) had pulled out. I ran it for a little bit but it has now begun leaking.


I am planning on putting a helicoil in but I'm not sure what the thread is to order the helicoil. Does anyone know? I was using APE cyl studs and torqued them halfway between min and max.

[gearhead13]

That sucks. I torqued my head down to 40-45 # and when I went to retorque, they wont budge even at 50#. No problems so far. If one pulled out on you I would be tempted to helicoil all of them.
I am going to be installing main studs soon, I really dont like torquing bolts into that soft aluminum

[Nicholaschase29]

I think i've got the size of M10x1.25 for the thread size and pitch, can anyone varify? Also, How long should i go? 15mm, 20mm?

Thanks,
Nick

[Big Jay]

I think i've got the size of M10x1.25 for the thread size and pitch, can anyone varify?
Thanks,
Nick

That is correct.

[Steve]

I re-torqued my 1166 cylinder head when i rebuild it and then rode it for a few 100 miles and then took the head off to re-torque ...

Why are you taking the head off to re-torque?

Seems to me, if you take the head off, you just have to start all over again.

.

[Nicholaschase29]

My bad, i meant valve cover.