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Author Topic: 1982 CB750F... The resto-not  (Read 11193 times)

Offline irk miller

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Re: 1982 CB750F... The resto-not
« Reply #290 on: Feb 12, 2019, 14:16:42 »
I would not use a hammer on your valve springs, especially because you will likely lose at least one keeper.   The tools are cheap and it's too easy to do to risk it.  My tool is like this.  I modified it just a bit and it has worked on every bike I've tried it on...



Just compress the spring, then take a retractable magnet to the keepers  and they just pop right out.  Then do the same for putting them in, but without the magnet.

If you were trying to change them with the head on, you can fill your chambers with rope, turn the motor over until it compresses a bit, then push the springs with your hands and get the keepers out with a magnet.

Offline advCo

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Re: 1982 CB750F... The resto-not
« Reply #291 on: Feb 12, 2019, 16:03:46 »
I would not use a hammer on your valve springs, especially because you will likely lose at least one keeper.   The tools are cheap and it's too easy to do to risk it.  My tool is like this.  I modified it just a bit and it has worked on every bike I've tried it on...



Just compress the spring, then take a retractable magnet to the keepers  and they just pop right out.  Then do the same for putting them in, but without the magnet.

If you were trying to change them with the head on, you can fill your chambers with rope, turn the motor over until it compresses a bit, then push the springs with your hands and get the keepers out with a magnet.

I was joking about the hammer...mostly. I have done it that way before but its definitely not the preferred method.

I've got a tool just like this, but I'm remembering that it didnt fit around the fins on the 360 when I was reassembling the top end. Mine must be a shallower throat depth.
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Offline irk miller

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Re: 1982 CB750F... The resto-not
« Reply #292 on: Feb 12, 2019, 16:11:16 »
I was joking about the hammer...mostly. I have done it that way before but its definitely not the preferred method.

I've got a tool just like this, but I'm remembering that it didnt fit around the fins on the 360 when I was reassembling the top end. Mine must be a shallower throat depth.
Yeah, you have to modify the jaws in order to fit inside the head. It's the angle of the spring and their orientation/distance to the inside lip of the head.  Once you modify it, they pretty much fit any Honda with an ajdustment of the thumbscrew.

Offline cb360j

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Re: 1982 CB750F... The resto-not
« Reply #293 on: Feb 12, 2019, 16:43:29 »
Common motor collective sells the style I use for motorcycle heads (also the one that Maritime posted link to), not sure if it would work on a 750 but it works for 550's. Its a little easier to use in my opinion vs. the one irk mentioned (which I would use for a sbc head)
« Last Edit: Feb 12, 2019, 16:45:23 by cb360j »

Online The Jimbonaut

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Re: 1982 CB750F... The resto-not
« Reply #294 on: Feb 12, 2019, 20:51:53 »
Valves removed no pasa nada, learnt a new thing today.  Never removed them before so good to know the process - my friend, who's a 30+ year motorbike mechanic and restorer extraordinaire, has all the tools and made swift work of it.  They were in bad shape - like brittle plastic.  Damn good job those things are out of the head and into the bin. 

I'm going to glass-bead clean the head before installing the new seals, which raises a question.  He strongly advised, using a collection of french, english and portugese words for "utterly shit", against using anything but OEM valve seals.  Same for the gaskets (base and head).  Would that be shared wisdom amongst you guys?  The generic gasket kit (which contains the valve seals as well) is gonna run me about $80.  ONE oem valve seal is going to set me back about $15, and I need 16 of the buggers.  And that's just for starters.

Are the generic gasket kits really that bad?  Anyone had any good/bad/utterly shit experience with them?
« Last Edit: Feb 12, 2019, 20:53:42 by The Jimbonaut »
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Offline Hurco550

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Re: 1982 CB750F... The resto-not
« Reply #295 on: Feb 12, 2019, 21:00:12 »
Are the generic gasket kits really that bad?  Anyone had any good/bad/utterly shit experience with them?

If my 2 cents (USD) is worth a penny and a half, I've had good luck with winderosa kits for both 2 stroke and 4 stroke engines. I've never had an issue with any of them personally. I am also not a 30 year veteran, but thinking at it now, I rebuilt my first 2 stroke snowmobile engine 15 year ago anyways (with the close guidance of my father ;) lol

The most recent one I purchased was the complete seal and gasket kit for my xr200 and I believe it cost me 40 bux shipped. It contained every single o ring, gasket and seal that could be replaced on that engine.

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Offline irk miller

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Re: 1982 CB750F... The resto-not
« Reply #296 on: Feb 12, 2019, 23:26:57 »
I get the blue viton valve seals and I try to get all viton o rings, so I get the benefit of ethanol tolerance. 

Offline Nybz

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Re: 1982 CB750F... The resto-not
« Reply #297 on: Feb 13, 2019, 03:24:36 »
Vitron all the way!
The stock ones don't hold up very well to ethanol.
Contact Genesound on the cb1100f forum....he has them on the cheap!
$15 for 16 seals plus shipping from US
He also has the upgraded cam holder bolts for cheap too

there are lots of people who only use OEM gaskets. I heard Cometic has good base and cylinder gaskets.

1979 CB750 LTD collectors plates
1979 CB750 K current custom rebuild
1980 CB750 F in waiting...

Past bikes
1982 GL1100
1980 CB400

Online The Jimbonaut

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Re: 1982 CB750F... The resto-not
« Reply #298 on: Feb 13, 2019, 10:19:41 »
That's invaluable, and has saved me a load of cash, thanks guys.  I'll check out the Viton seals, and will shoot Genesound a message on that other forum.  I read somewhere that Athena's gaskets hold up pretty well, and I'll definitely check out Cometic and Winderosa.

Buying a non-branded gasket and seal kit does give me paws pause.
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Offline irk miller

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Re: 1982 CB750F... The resto-not
« Reply #299 on: Feb 13, 2019, 10:23:02 »
I've used all three brands with great success.  There really isn't a difference material-wise in each brand gasket.  Fitment from better dies seems to be what separates most of them from each other.  Cometic will also do an MLS head gasket, which IMO is a better deal.  I use copper on most of my bored motors, but both of my 750 choppers have the graphite Cometic head gaskets.