What does a gearbox breather look like?

I have lost the pipe or fitting from my clutch cover that the breather pipe attaches to. 1981 CR430.

The bike has been in many bits for 25 years and somewhere along the way the fitting has gone missing. I can't see anything on the parts fiche. I can't find a picture anywhere of what it should look like.

It should be easy to fit something with a 7.5mm OD into the case, but would be nice to know what it should look like. Anyone got a picture of it?

thanks
Leigh

That looks just like my 81 430 . Hose is placed into the hole for the breather . I route mine into the air box . I can send a picture when I get home after work if you want .

Sometimes people pull on the breather/vent hose when removing the motor from the frame and the fitting pulls out and stays attached to the hose. So if you have the hose laying around look in the end of it, the fitting may still be on the end of the hose. If you have the complete bike look on the frame to see if the hose is zip tied to the frame. Hope this helps.

Marty

Not all had a fitting for the breather hose . Mine didn’t have a fitting since new .

Thanks for the image.

What is the diameter OD of that pipe fitting please It looks a lot larger than my hole.

Thanks for the replies. I hadn't considered there was no fitting at all. I haven't lost any other parts so perhaps there never was one.

81-82 models used a smaller fitting compared to 83 and later models. In 83 the fitting made larger. They all were a press fit in the side cover, not threaded. I will measure both sizes and get back to you.

Marty

81-82 has 10mm OD on the hose fitting on the end that the hose fits on and some of those fittings are necked down to 7.5mm or so on the end that presses into the clutch cover.

83 and later have a 13mm OD hose fitting.

Marty

with air rubber !! is good :

10mm necked down to 7.5mm fitting would be good. Have never seen anything like that around though.