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Author Topic: 1982 CB750F... The resto-not  (Read 32513 times)

Online Jimbonaut

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Re: 1982 CB750F... The resto-not
« Reply #240 on: Jan 31, 2019, 18:19:15 »
Chatting with a moto guy today, told me in order to repair the crooked spark plug thread I have to pull the head, no matter what.  Folk here have said that this is a job that can be done - carefully - without pulling the head.  The thread is totally crooked, easily 10-20 degrees off true.  Helicoil is the way to go I'm told, bit what gives?  If I drill out the new hole for the helicoil very slowly, and with the bit covered in grease, that should do it, no?  Obviously I want to avoid shit from falling ito the cylinder, but I've never installed a helicoil before so trying to get the skinny on how to approach the job.

Again, to pull the head or to not pull the head - that is the question.
"I'm telling you Donnie, nuthin' but nuthin' but right"

Online Jimbonaut

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Re: 1982 CB750F... The resto-not
« Reply #241 on: Jan 31, 2019, 18:24:50 »
Also scored a free monster vice -



I think it's about 2000 years old and weighs as much as my car.  Seems legit. 
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline 1fasgsxr

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Re: 1982 CB750F... The resto-not
« Reply #242 on: Jan 31, 2019, 18:28:33 »
Nice score! I need a new vice...or an old one. Just not my broken one.
http://www.dotheton.com/forum/index.php?topic=41083.0

Life is a journey from the maternity ward to the crematorium....

Offline pidjones

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Re: 1982 CB750F... The resto-not
« Reply #243 on: Jan 31, 2019, 20:27:38 »
Nice vice. I think if your plug is that far off, you might at a minimum consider a Timecert. It's possible that the head may need welded up and redrilled, however.
"Love 'em all.... Let God sort 'em out!"

Offline jordandogtown

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Re: 1982 CB750F... The resto-not
« Reply #244 on: Feb 01, 2019, 09:44:08 »
I think I would bite the bullet and pull the head. I'm the type that no matter how careful I was with drilling, I'd always be paranoid something slipped by and I would be sitting on a time bomb.

That thinking has also led me to a lot of unnecessary work/frustration, so...
"A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils, and lunatics" George Fitch, 1916

1979 CB750F Tracker (maybe?)

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Offline advCo

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Re: 1982 CB750F... The resto-not
« Reply #245 on: Feb 01, 2019, 10:36:02 »
Chatting with a moto guy today, told me in order to repair the crooked spark plug thread I have to pull the head, no matter what.  Folk here have said that this is a job that can be done - carefully - without pulling the head.  The thread is totally crooked, easily 10-20 degrees off true.  Helicoil is the way to go I'm told, bit what gives?  If I drill out the new hole for the helicoil very slowly, and with the bit covered in grease, that should do it, no?  Obviously I want to avoid shit from falling ito the cylinder, but I've never installed a helicoil before so trying to get the skinny on how to approach the job.

Again, to pull the head or to not pull the head - that is the question.

If its me I'm not gonna risk it for the biscuit, I'd pull the head.

Online Jimbonaut

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Re: 1982 CB750F... The resto-not
« Reply #246 on: Feb 01, 2019, 10:43:09 »
Not gonna risk it for the biscuit.  Shit man, I'm stealing that.

Pull the thing?  Think that's the best option?  Weighing everything up it makes sense on many levels.  I'm listening to some righteous dub, makes any decision easier.
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline advCo

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Re: 1982 CB750F... The resto-not
« Reply #247 on: Feb 01, 2019, 11:11:05 »
Not gonna risk it for the biscuit.  Shit man, I'm stealing that.

Pull the thing?  Think that's the best option?  Weighing everything up it makes sense on many levels.  I'm listening to some righteous dub, makes any decision easier.

Its not a whole lot of extra work, and not much to mess up. While its out you can do the valve stem seals, and do the alcohol test to make sure your valves are all sealing properly.

Online Jimbonaut

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Re: 1982 CB750F... The resto-not
« Reply #248 on: Feb 01, 2019, 11:22:06 »
Its not a whole lot of extra work, and not much to mess up. While its out you can do the valve stem seals, and do the alcohol test to make sure your valves are all sealing properly.
That's the plan - once I pull it then I can do the valve seals as well, maybe do a bit of porting and sort out the spark plug snafu of course.  Not to mention it'll make painting the lump a bit easier. 

Scoping out the best option for a gasket kit, but to be honest I'm not sure exactly what I'll need (other than the obvious).  I know for example there are some copper crush washers that need to go under the cylinder stud nuts but I don't see them in any gasket kit.  This kit for example -

https://www.ebay.com/itm/Engine-Rebuild-Kit-Honda-CB750-C-F-K-L-SC-1979-1982-DOHC-Gasket-Set-Seals/173035071895?fits=Year%3A1982%7CMake%3AHonda&hash=item2849b1a997:g:pX4AAOSwdTJaa7w9:rk:1:pf:1

- seems complete but not sure if there's anything else I need to order.  Any ideas?
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline jordandogtown

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Re: 1982 CB750F... The resto-not
« Reply #249 on: Feb 01, 2019, 11:37:05 »
Can't help with the gasket kit - but you might as well throw in a big bore kit while you're in there?  ;D
"A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils, and lunatics" George Fitch, 1916

1979 CB750F Tracker (maybe?)

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1979 CB750F Part Out