TOPIC:

I have rebuild my front forks with new good parts. I have a question for my new Cap Fork Top (Kawa 440291005), see attached picture.
I don`t have the air valve... what shall I do? what bolt can I use, is there special threads, I tried different sizes, but they are not fit 100%... ?

My plan is to install air valves later when I`m able to get 2, but for now is the plan jus to bolt of the wholes...
I can see that the end of the whole is graded in buttom?

Thank you all for helping me out.

I would take the air valve & fork cap to the hardware to see if you can figure out the size.
The 10mm headlight bolt of my 81 650-CSR seems to be a good fit into the air valve orifice. see pic.
I don't know what the thread pitch is. If you find something that fits, teflon tape could be used to seal the threads.

martin_csr wrote: I would take the air valve & fork cap to the hardware to see if you can figure out the size.
The 10mm headlight bolt of my 81 650-CSR seems to be a good fit into the air valve orifice. see pic.
I don't know what the thread pitch is. If you find something that fits, teflon tape could be used to seal the threads.

Hem I think I tested 10mm, I will do again... So I don`t need to be afraid to damage the seat in the buttom of the whole?

Maybe the bolt you checked had the wrong thread pitch?
I'm pretty sure the metric thread pitch on mine is 1.25 mm between threads.
standard pitch = 1.50 .... fine = 1.25 ... extra-fine = 1.00 ... JIS = 1.25 ... note: JIS = Japanese Industrial Standard

As for the bottom of the orifice, I don't think the air valve seats or seals there. The air valve has an o-ring.
Measure the depth of the orifice. also, look at how it's drilled at the bottom.

The 650-csr orifice is about 14mm deep. but the air valve threads are 10 mm in length.
I'm not sure how I'd do it, but you could try a socket screw or maybe a set screw. add washers &/or an o-ring as necessary.
Install the screw w teflon tape on the threads. with a set screw maybe put a small o-ring in the hole first.
The smallest available M10 socket screw is probably M10 x 16mm L.

M10*1.25 Pitch Fine Stainless 304 Allen Socket Cap Head Screws Bolt

Stainless Steel Button Head Screws A2 Hex Socket Bolts M3/M4/M5/M6/M8/M10 >>> Thread pitch not listed. ???

specialty set screw >>> ball point grub screw not recommending it. I just now stumbled across it on eb. the ball end is spring-loaded.
...

It was 10mm and normal threats as you said Martin, thank your for your inputs.

Today have I installed bolts with teflon, I think that is good enough?

See attached photo.

No eBay APP ID and/or Cert ID defined in Kunena configurationI would use these kind of stainless M10 screws, looking a way better (invisible).

Thank you, really good input !

He was not shipping to Norway, but has sent him a message.

They should be available in a nuts and bolt shop in Norway.
I pay only 99 cent for 20 of them in my local shop, buy all my stainless screws their.
It is like a screw paradise.

What do you call screws like these in English?

I have found now thank you for these input, it will be nicer look on the bike now

We here in Germany call them Madenschraube = maggot screw

gordone wrote: What do you call screws like these in English?

Usually, socket set screw, or just set screw.