Topic: Sure would be nice if they published the specs on these exhausts

[eigenvector]

I picked up a set of repro 4 in 4 exhausts for my CB550.  Since I don't have the stays I have to manufacture them.  I have the stays made, but whoever made the exhaust didn't include nuts for the bolts that are embedded in the muffler.

I guessed based on my micrometer - figuring it was a standard 8mm.  NOPE!  So now I have to run to the hardware store to pick up a selection of nuts to see which one it is.
8mm fine pitch?
5/16"?
5/16 fine pitch?

It is for a Japanese bike, so I am making a big assumption that it's metric, but 8mm 1.25 pitch (standard) was close but no cigar.

The other wrinkle - the upper pipe uses a 10mm bolt, but they included the nut for that  
Why use 2 fine pitch 8mm bolts on the lower pipe and a single 10mm standard pitch bolt on the upper.  Beats me.

[754]

You have a mcrometer but cant measure pitch? Just use a caliper or ruler and count.
Mm is .040 for this exercise..
1.5 mm pitch is very near to 16 tpi... Or use loose bolts you have to compare pitch.

[bender01]

Where did you find these repros? Are they for pre 77 K or later?

[eigenvector]

You have a mcrometer but cant measure pitch? Just use a caliper or ruler and count.
Mm is .040 for this exercise..
1.5 mm pitch is very near to 16 tpi... Or use loose bolts you have to compare pitch.

I really just wanted to gripe.
For as much as they sold the kit for, you think they could have thrown in 2 bucks worth of hardware.

But I will say this - it ain't 8mm 1.25 or 1.0 pitch.  it's not 5/16 x18 or 24 either.
My solution - they chrome the plated the bolts with messed up the threads, I'm going to recut them with an 8mm x 1.25 pitch die and be done with it.

[flybox1]

M6.  Either 1.0 or 1.25

[eigenvector]

Nope.  Definitely 8mm x 1.25 pitch.

I recut the threads and they were all junked up with chrome plating.

Looks like I'm going to have a busy weekend putting the new pipes on.