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Anyone have a die nut to run down the exhaust nuts on a 3 1/2? I checked back through the forums and a couple of people tried this and wondered how they got on.

John.

I have both a tap and a die and use them as and when I've scruffy exhaust nuts or exhaust ports. I've several 350 bikes and several 501 bikes (which use a larger thread). I believe using the tap/die does help improve the ease of the nut fitting into the head.

I bought the tap and die on eBay, there are some that are tolerable prices and others that I can't justify paying even though they may be better quality tools. I seem to remember my tap was relatively inexpensive. There are occasionally sellers who have a used item or a one-off they sell cheap.

To provide context, I buy tools whenever I have a reason to do so. Your needs and habits may vary.

Could you kindly post a picture? I don´t have any idea of what or how is a die or tap

Norbert, tools for cutting threads. Tap for an inside thread (nut), die for an outside thread (Bolt or screw).

In the first instance, save yourself some money by modifying an old exhaust nut to do the job.

Photos of mine attached- cut into the thread at 90 degrees in 3 places around the nut and then file a lead in to the new edge.

Will do a pretty good job of cleaning up head threads and significantly reduces the risk of cutting a cross thread which you might do with a tap.

Obviously if the head is really mullered this won’t help much but then a tap probably wouldn’t either, unless you’ve had a insert welded into the head and need a completely new thread (at which point you may as well use an expert like Paul Compton to to do the job for you)

Of course I’ve just re-read your post and realised it’s the nut you want cleaning up not the head… but the above info may still be of use to others

Thanks for the aclaracion!

The easiest way trying to save a nut would be a thread file, a very useful tool anyway