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SOHC.co.uk Forums => CB350/400 => Topic started by: Phantom Rider on March 23, 2020, 08:10:41 PM

Title: Refitting cylinder head - washer and nuts?
Post by: Phantom Rider on March 23, 2020, 08:10:41 PM
The rebuild of my 400/4 continues at a snails pace - however working from home may have some hidden benefits i.e. more time to tinker with my collection of old bikes!!  I need to replace the head gasket, and was planning to replace the domed nuts and various washers - however after pricing this up on the David Silvers site I'm reconsidering whether this is necessary. What is the considered opinion on what should be replaced, and what can be reused.  Also are there any other suppliers of these items?  Thanks in anticipation.

Stay safe everyone and if you have to self isolate the garage is the perfect place to do it!!

Cheers

Steve
Title: Re: Refitting cylinder head - washer and nuts?
Post by: Bryanj on March 23, 2020, 08:28:02 PM
Just replace the "copperised" washers which i think are those under the domed nuts but not sure and i think they are a Honda only part
Title: Re: Refitting cylinder head - washer and nuts?
Post by: Bryanj on March 23, 2020, 09:02:59 PM
You aint gona get them now unless you order from cms as Silver will be closed
Title: Re: Refitting cylinder head - washer and nuts?
Post by: Bryanj on March 23, 2020, 09:09:35 PM
90442377000 and there are only 2 of them but €7 each +tax and shipping
Title: Re: Refitting cylinder head - washer and nuts?
Post by: Athame57 on March 24, 2020, 02:21:53 PM
You aint gona get them now unless you order from cms as Silver will be closed
The David Silver home page says their mail order continues to function. If you can't see what you are looking for on the new parts list you can ask them if they have it anyway. That's how I got an obscure bit for a carb, they cannibalised one for me. https://www.davidsilverspares.co.uk/
Title: Re: Refitting cylinder head - washer and nuts?
Post by: mike the bike on March 24, 2020, 02:35:40 PM
Try annealing them and re use.
Hesg you a cherry red colour and quench.   This softens them up so they seal better.
Title: Re: Refitting cylinder head - washer and nuts?
Post by: Bryanj on March 24, 2020, 03:25:45 PM
Mike you cant anneal them they are not solid copper, they are only "copperised" as a coatind
Title: Re: Refitting cylinder head - washer and nuts?
Post by: mike the bike on March 24, 2020, 03:35:27 PM
Mine are solid copper
Title: Re: Refitting cylinder head - washer and nuts?
Post by: Bryanj on March 24, 2020, 04:12:51 PM
Maybe aftermarket, didnt do that many 400's way back, to be honest didnt do many of any Jap 4 stroke(cept CX500) and only remembering a couple i did 5-10 years back so willing to be proved wrong
Title: Re: Refitting cylinder head - washer and nuts?
Post by: ka-ja on March 24, 2020, 07:28:39 PM
Don't the ones under the "dome" nuts have washers with a built in rubber seal?
Title: Re: Refitting cylinder head - washer and nuts?
Post by: Nurse Julie on March 24, 2020, 07:49:14 PM
Don't the ones under the "dome" nuts have washers with a built in rubber seal?
Yes, Dowty type washers under the two tall domed nuts.
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