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Resurrecting Rusty - My CB400F - Valve Clearances - tools

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SeanFD:
I spent the last 2 days trying to get the airbox onto my carbs and in the end had to take the carbs off again and remove the rubbers from the airbox itself in order to get them on. Now I have the carbs and airbox as one unit and just have to try to fit that! Looking forward to it!! :)

However before doing that I decided to set the valve clearances. I have no problem with the process, just the tools. As it seems with this project from the start, I am working with a limited set of tools, so I'm struggling.

Can someone please confirm the size of the adjusting screw locknut? I think it is 9mm.

Also what do folk use to turn the adjusting screw itself? I'm using what I think is a bicycle spoke spanner, but it is far from ideal. Is there anything that works better?

Cheers

Oddjob:
Doubt it would be 9mm, non standard size for Honda. Been many years since I last did the tappets on a 400, I would say 8 or 10mm for the nut, does the adjuster have a slot or is it the odd design of a square type of head like a C50.

If it's the square type there are small screwdriver type tools around that fit those.

waffey:
9mm flat to flat

SeanFD:
8mm too small and 10mm too big, hence my guess at 9mm; glad to have it confirmed.

It's a little square headed screw, but there is no slot in it.

Oddjob, can you post a pic or link to one of those tools?

4wDaz:
I use this


https://www.ebay.co.uk/itm/251957752640?hash=item3aa9da3340:g:OzEAAOSwENVfh7Cm

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