Author Topic: New (to me!) '77 CB400F - US model  (Read 38236 times)

Offline paul G

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Re: New (to me!) '77 CB400F - US model
« Reply #135 on: November 16, 2018, 04:29:14 PM »
No point thinking about engine rebuilds until you know how long the trap and air filter box hasn't been cleaned for. Mine filled with oil vapour quite quickly due to internal damage the engine had sustained previously causing raised crank pressure. Give it all a good clean out, fit new foam (make your own out of akitchen foam scratchy thingy) and air filter,ride it and observe. Even if there is nothing particularly wrong with your engine, its an old engine so internal wear is to be expected but oil vapour doesn't give conclusive evidence that there is a problem that needs immediate attention. As has already been pointed out a combination of oil vapour and blue smoke would give more of an indication that there may be a problem.

Tut Tut modern day women ;) it's a scourer
« Last Edit: November 16, 2018, 04:31:51 PM by paul G »
Honda CB400 4
Honda CB550 K3 (sold)
Honda CB750 UK K1
Kawasaki Z650 C2
Kawasaki Z650 cafe racer (Sold)
Honda CD175 sloper

Offline mattsz

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Re: New (to me!) '77 CB400F - US model
« Reply #136 on: November 16, 2018, 04:32:22 PM »
Tut Tut modern day women ;) it's a scourer

Wait... should I be including the yellow soaker-upper do-dad with the scratchy thingy?

Offline Nurse Julie

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Re: New (to me!) '77 CB400F - US model
« Reply #137 on: November 16, 2018, 04:36:33 PM »
No point thinking about engine rebuilds until you know how long the trap and air filter box hasn't been cleaned for. Mine filled with oil vapour quite quickly due to internal damage the engine had sustained previously causing raised crank pressure. Give it all a good clean out, fit new foam (make your own out of akitchen foam scratchy thingy) and air filter,ride it and observe. Even if there is nothing particularly wrong with your engine, its an old engine so internal wear is to be expected but oil vapour doesn't give conclusive evidence that there is a problem that needs immediate attention. As has already been pointed out a combination of oil vapour and blue smoke would give more of an indication that there may be a problem.

Tut Tut modern day women ;) it's a scourer
Ok Paul, it's Friday, i can't remember the name of anything by Friday 😭😭😭
Anyways, here's mine. [ Guests cannot view attachments ]
LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Online taysidedragon

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Re: New (to me!) '77 CB400F - US model
« Reply #138 on: November 16, 2018, 04:37:43 PM »
Tut Tut modern day women ;) it's a scourer

Wait... should I be including the yellow soaker-upper do-dad with the scratchy thingy?

Of course! It's handy for cleaning your paintwork when you're out for a ride.  ;) :o ???
Gareth

1977 CB400F
1965 T100SS

Offline paul G

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Re: New (to me!) '77 CB400F - US model
« Reply #139 on: November 16, 2018, 04:38:43 PM »
You could sell that as an unused gift ;D
Honda CB400 4
Honda CB550 K3 (sold)
Honda CB750 UK K1
Kawasaki Z650 C2
Kawasaki Z650 cafe racer (Sold)
Honda CD175 sloper

Offline Nurse Julie

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Re: New (to me!) '77 CB400F - US model
« Reply #140 on: November 16, 2018, 05:32:17 PM »
You could sell that as an unused gift ;D
It was given to me by someone as an unusual gift Paul....i will give you only one guess who that was !!! 😏😏😏
LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline paul G

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Re: New (to me!) '77 CB400F - US model
« Reply #141 on: November 16, 2018, 10:41:42 PM »
 ::) ::) ::) ;D
Honda CB400 4
Honda CB550 K3 (sold)
Honda CB750 UK K1
Kawasaki Z650 C2
Kawasaki Z650 cafe racer (Sold)
Honda CD175 sloper

Offline mattsz

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Re: New (to me!) '77 CB400F - US model
« Reply #142 on: November 16, 2018, 11:22:45 PM »
Julie - that's much thicker than my original disintegrating one - any reason for that?  Or for keeping the scratchy bit?

Offline Nurse Julie

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Re: New (to me!) '77 CB400F - US model
« Reply #143 on: November 16, 2018, 11:34:26 PM »
Julie - that's much thicker than my original disintegrating one - any reason for that?  Or for keeping the scratchy bit?
I don't use the scratchy bit, i just cut a slice off of the bottom of the sponge, the same depth and size as the space under the panching plate . Does the job a treat.
LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline mattsz

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Re: New (to me!) '77 CB400F - US model
« Reply #144 on: November 16, 2018, 11:39:13 PM »
Julie - that's much thicker than my original disintegrating one - any reason for that?  Or for keeping the scratchy bit?
I don't use the scratchy bit, i just cut a slice off of the bottom of the sponge, the same depth and size as the space under the panching plate . Does the job a treat.

Ahh - I thought that photo was showing how you used the whole thing!  Got it now...

Funny the things we focus on - that little piece of sponge, a 30-second job to replace, when there's so many bigger ticket items looming!

Offline mattsz

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Re: New (to me!) '77 CB400F - US model
« Reply #145 on: November 26, 2018, 10:19:37 PM »
Ok, so I thought I'd remove the front wheel so I could squeeze the caliper piston out with the brake lever before dismantling.  Let's see, step one: "remove the speedometer set screw." Easy enough.  Hmm, the recess looks pretty small, what size allen wrench is that?  None of mine fit.  Wait, where's my damn glasses, that doesn't look quite right:

(Attachment Link)

Wha? Quick forum search for that set screw... oh.  So this is how it's going to be, huh? (sighs...)

I found the speedo cable set screw in the parts book... Frame Group, Block #2A, Ref. #437, Part #93700-05016-0A, "screw, oval, 5x16".  I can't find the tach cable set screw in the parts book.  I declared earlier that I had read somewhere that they're the same screw, but not sure now where I came by this info.  Can anyone confirm whether they're in fact the same screw?

Offline Nurse Julie

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Re: New (to me!) '77 CB400F - US model
« Reply #146 on: November 26, 2018, 10:32:52 PM »
Cross reference with the CMSNL fiche

 https://www.cmsnl.com/honda-cb400f-four_model14342/
LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline mattsz

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Re: New (to me!) '77 CB400F - US model
« Reply #147 on: November 26, 2018, 11:19:13 PM »
Cross reference with the CMSNL fiche

 https://www.cmsnl.com/honda-cb400f-four_model14342/

Hmm... seem to be the same diagrams I've got already - anyway, I don't see the tach cable set screw...
« Last Edit: November 26, 2018, 11:25:34 PM by mattsz »

Online taysidedragon

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Re: New (to me!) '77 CB400F - US model
« Reply #148 on: November 27, 2018, 12:24:34 AM »
I'm pretty sure that they are the same size. I'll check tomorrow.

I bought a set of engine case screws online for my bike which included the tach cable screw, but it was completely wrong. I cut down a longer screw to the right length in the end.
Gareth

1977 CB400F
1965 T100SS

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Re: New (to me!) '77 CB400F - US model
« Reply #149 on: November 27, 2018, 10:12:44 AM »



Hmm... seem to be the same diagrams I've got already - anyway, I don't see the tach cable set screw...

I just checked mine. 5 x 18mm countersunk head and it does fit the Speedo drive as well.
Gareth

1977 CB400F
1965 T100SS

 

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