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Author Topic: 1982 CB750F... The resto-not  (Read 33459 times)

Offline Jimbonaut

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Re: 1982 CB750F... The resto-not
« Reply #320 on: Feb 19, 2019, 19:21:05 »
Got the call from the machine shop, head's now looking spiffy after a glass bead clean.  They also repaired the buggered spark plug thread, and cleaned up the others which, to be fair, were grateful for the attention -



Not sure what they're called but the little wells that the valves sit in look brand new -



- and that can only be a good thing.  Waiting on my Viton valve seals to show, then this puppy gets rebuilt.  Also discovered that the overhead cam chain tensioner (the bowed plastic part) has a huge crack in it.  So turns out pulling the head really has been a good idea. 

Fucking hell it's cold in my garage.  Quite frankly a witch's tit sounds cozy compared to my garage.  Shnuggling up in a witch's cleavage sounds absolutely horrific whatever the situation, but definitely warmer than the absolute zero that is my garage.  Fuck.
« Last Edit: Feb 19, 2019, 19:23:22 by The Jimbonaut »
"I'm telling you Donnie, nuthin' but nuthin' but right"


Offline Jimbonaut

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Re: 1982 CB750F... The resto-not
« Reply #322 on: Feb 19, 2019, 20:08:10 »
It doesn't look very cold.
No?  I guess that's something then.  At least I'm not transmitting the deep freeze through the wonders of the internet.
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline Maritime

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Re: 1982 CB750F... The resto-not
« Reply #323 on: Feb 19, 2019, 21:20:19 »
Its fucking -32f or some shit with windchill. Its cold
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Offline Jimbonaut

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Re: 1982 CB750F... The resto-not
« Reply #324 on: Feb 19, 2019, 21:32:00 »
It's fucking madness Mike is what it is.  "Divide it east to west, it'll be brilliant" said no Canadian ever.
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline Maritime

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Re: 1982 CB750F... The resto-not
« Reply #325 on: Feb 19, 2019, 22:12:25 »
Yep. Thank god for 7.9% abv winter warmer pi
nts 😁
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Offline Jimbonaut

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Re: 1982 CB750F... The resto-not
« Reply #326 on: Feb 20, 2019, 11:15:06 »
I thank god for lots of things this time of year - thermal underwear, bourbon, eventual snowplows...but this morning, receiving photos of a mate's holiday villa in sunny Costa Rica via WhatsApp, shit.  I'm not thanking god for WhatsApp today.

Now that the head's all pretty it's time to reinstall the valves.  This'll be the first time I've done this so before I get started does anyone have any tips or must do's (or do nots)?  The valves have all been numbered so I know where they all go - first thing I gotta do is lap them.  I'll pick up some paste today - are they all pretty much the same?  I can get this from Canadian Tire -



- and also the little suction cup tool.  Anything I should know, I'm absolutely all ears.

"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline Maritime

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Re: 1982 CB750F... The resto-not
« Reply #327 on: Feb 20, 2019, 11:24:16 »
Do not over do it. Honda valves have a coating to harden them and if you grind it all off they will wear exponentially faster. I would install them and if they seat without leaking, don't even lap them. if they seep a little, lap only those ones.
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Offline Jimbonaut

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Re: 1982 CB750F... The resto-not
« Reply #328 on: Feb 20, 2019, 11:59:00 »
Do not over do it. Honda valves have a coating to harden them and if you grind it all off they will wear exponentially faster. I would install them and if they seat without leaking, don't even lap them. if they seep a little, lap only those ones.
"Seat without leaking" - from what I've learnt, this can be checked by installing the valves into the guides (no seals, springs etc), filling the combustion chamber with water, press down on all four valves, and then blow air into the intake/exhaust port.  Any bubbles will show where the valve needs to be lapped more.  Is this the (or at least, a) way to check the seats?
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline advCo

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Re: 1982 CB750F... The resto-not
« Reply #329 on: Feb 20, 2019, 12:07:09 »
I've always done isopropyl in the ports, and see if they seep. I do it before I take the valve springs and keepers off.