exhaust studs

Have a new set of 6mm exhaust studs for my 76 kz900. Old studs already removed. I see that 1 end has more thread than the other. hich end goes into the head the one with more threads or less? thanks

Can you check partzilla for a parts diagram, that may show the orientation?

I would use a small diameter rod or dowel, or a caliper depth gauge if you have one, to measure the depth of the stud holes in the cylinder head. You will probably find that the depth of the holes are less that the longest threaded portion of the stud.

If that is true, whatever you do, DO NOT screw in a threaded end that is longer than the hole is deep. If you do, the stud will bottom out in the hole. If that happens the stud will pull the threads out of the cylinder head as you continue to tighten it, and you will be off to find a good machinist. Ed

Sound advice. I haven't had mine out in a long time but as I remember, the head takes the most threads.
Steve

Ok thanks

The exposed threads, those that the diffuser and header pipe are connected to, measures 1/2" of thread length.
And by that, I mean only the exposed threaded part of the stud... not the entire length of exposed stud. There is a 1/2" worth of threads.

once the stud bottoms out you will no longer be able to turn it in and there will be no danger of pulling out the threads in the head. :dry:
This will keep the stud from turning as you put the nut on over the clamp and tighten the individual pipes in place :ohmy:

ezrider714 wrote: once the stud bottoms out you will no longer be able to turn it in and there will be no danger of pulling out the threads in the head. :dry:
This will keep the stud from turning as you put the nut on over the clamp and tighten the individual pipes in place :ohmy:

This has not been my experience. I've had it happen numerous times on my old bike. The problem is that as you continue to tighten it after it bottoms out the stud (or bolt) has no place to go so as it turns it pushes the threads out. Been there, done that. Ed

If the nut is munged up or rusty, it should be replaced. Heat and water will make them unuseable. The studs are not intended to come out in this manner.
Steve

Must have used a hell of a breaker bar :ohmy: When a stud bottoms out it can no longer be turned with normal force, cause as you state it has nowhere to go and a simple wrench can not force it to go nowhere. I'm sure with excessive force the threads can began to give way but feel should prevent that from ever occurring :blink: