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Oil behind ignition cover on 1980 CB750F

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sch071
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Oil behind ignition cover on 1980 CB750F

sch071
Just decided to check ignition timing on my 1980 cb750F and as soon as I loosened those 3 bolts oil just start running out (a lot of oil). I assume seal is bad and has to be replaced. How hard would be to replace that seal and, if is possible to change, where to buy it and how much would cost. Any help is appreciated. Regards,  sch071
LukeM
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Re: Oil behind ignition cover on 1980 CB750F

LukeM
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Which side did you open?  If it's the left side cover, there should be a little oil in there for the starter gears.  If you keep it on the center stand, you won't drip too much.  If you're on the kickstand, quite a bit more will come out.

Luke M
Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.
Lucky 1
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Re: Oil behind ignition cover on 1980 CB750F

Lucky 1
The ignition points are on the other side.
The seal can be taken out and replaced not a problem.
On a Roadstar Adventure.
Lucky 1
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Re: Oil behind ignition cover on 1980 CB750F

Lucky 1
In reply to this post by sch071
3 screws.

Bolts are 1/4 inch or larger in diameter. When it is 1/4 or smaller it is refered to as a screw.
On a Roadstar Adventure.
shinyribs
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Re: Oil behind ignition cover on 1980 CB750F

shinyribs
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lucky wrote
3 screws.

Bolts are 1/4 inch or larger in diameter. When it is 1/4 or smaller it is refered to as a screw.
So is 1/4 considered a bolt or a screw then?
TOOLS1
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Re: Oil behind ignition cover on 1980 CB750F

TOOLS1
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In reply to this post by Lucky 1
What about "Stove bolts"? I have seen them as small as #4-40
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."

1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
sch071
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Re: Oil behind ignition cover on 1980 CB750F

sch071
In reply to this post by LukeM
Luke, thanks for your reply, highly appreciated.
I did open left side cover ( sitting on the bike, facing forward), removed 3 screws ( not bolts, sorry my bad) and exposed ignition points ( I can see small starter gear and big thin gear behind pickup points. Problem is that oil just started running out ( it was on kickstand, I do not have center stand). If I lean bike even more, oil will just run and run (I could do oil change this way). If I keep bike in "center stand" position oil will stop running. Is this normal at all, if I lean bike that oil just run and run. If is seal, can I change it by my self, what is price and best place to buy this seal? Regards, sch071
LukeM
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Re: Oil behind ignition cover on 1980 CB750F

LukeM
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Well, maybe I wasn't specific enough:
My 79 CB750L also let oil out when I pulled that cover. I think it needs a little oil for the starter gears inside there. So I'm not necessarily sure there is a bad seal inside there.
An investigation of the microfiches at BikeBandit or OldBikeBarn will tell if there IS a seal in there, or it's just a crank-to-bearing-to-case fit.  I'm almost positive there is one for the right side where the alternator is.  You Definitely don't want oil on that side.

I hope this helps.
Luke M
Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.
shinyribs
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Re: Oil behind ignition cover on 1980 CB750F

shinyribs
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So the charging system and ignition is swapped-sided from a SOHC to a DOHC?
TOOLS1
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Re: Oil behind ignition cover on 1980 CB750F

TOOLS1
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Yep!
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."

1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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