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Rocker arm holes

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Dirty

Rocker arm holes

Anybody come across this?
cyl 3-4

Bottom pic missing oiling holes for rocker shaft. on my K they are all drilled.

No reason a CB 750 cant be your first bike at 15 years old!!

shinyribs

Re: Rocker arm holes

Administrator

I ran across that when the cam died in my chopper. My '72 and my '76 model bikes are like your bottom pic. The '78 model engine I have has the extra holes. All they do is keep the rocker shaft from rotating in the cam towers. I don't know why or when they changed it. Maybe they discovered the shafts were rotating in the towers and causing the towers to wear? Thats my guess at least.

My two early motors also don't have the thrust washer on the end of the crank like the 78 does. Even though the cams are drilled for it

Strange stuff...

Dirty

Re: Rocker arm holes

Shiny, my 78K has oiling holes (thats what I would think they are in there for) on both sides and my SS ony has one side drilled. Im guessing they just missed them. I know the center holes are there for bolts to hold rocker shafts. but im wondering about the two holes on either side of shaft bolt.

No reason a CB 750 cant be your first bike at 15 years old!!

TOOLS1

Re: Rocker arm holes

Administrator

In reply to this post by Dirty

Yep. Early, and late. I think the change happened around 74-75.
TOOLS

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shinyribs

Re: Rocker arm holes

Administrator

In reply to this post by Dirty

Dirty wrote

Shiny, my 78K has oiling holes (thats what I would think they are in there for) on both sides and my SS ony has one side drilled. Im guessing they just missed them. I know the center holes are there for bolts to hold rocker shafts. but im wondering about the two holes on either side of shaft bolt.

Oiling holes? If there only seems to be one oiling hole the other must be plugged. Theres one hole her pair of cam lobes. Two on each tower. There couldn't be just one. Unless I'm way off on understanding you. And thats highly likely

Dirty

Re: Rocker arm holes

Ribs, I dont know how to put those fancy arrows on my pic so ill go out in garage and do it manually

No reason a CB 750 cant be your first bike at 15 years old!!

Dirty

Re: Rocker arm holes

In reply to this post by shinyribs

here is the difference i was talking about shown by my fancy black arrow!!

No reason a CB 750 cant be your first bike at 15 years old!!

shinyribs

Re: Rocker arm holes

Administrator

LOL. If I can figure out Windows Paint anyone can! Yeah,those are where the bolts go that keep the rocker shafts from rotating inside the cam tower. No oil comes out of there.

Dirty

Re: Rocker arm holes

Then why does one side have them and not other?

Sent from me

On Dec 1, 2012, at 11:29 PM, "shinyribs [via Honda CB750'S]" <[hidden email]> wrote:

LOL. If I can figure out Windows Paint anyone can! Yeah,those are where the bolts go that keep the rocker shafts from rotating inside the cam tower. No oil comes out of there.
Montvale,Virginia
Piute said it best: "wheres my 10mm?"
Hellbilly-"that is a great way to tell if you have come to your senses, when you start drilling random holes in things... "

LukeM-"Scooters rock, especially when they're in posse formation. "

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NAML

No reason a CB 750 cant be your first bike at 15 years old!!

shinyribs

Re: Rocker arm holes

Administrator

Someone has mismatched then in the past I suppose. I wouldn't worry about it though. I don't know what the reason for the change in design was,but the early bikes don't seem to miss it.

Dirty

Re: Rocker arm holes

Ya that's what I was thinking. I have another set off my k I would use when I put motor back together. Thanks shiny

Sent from me

On Dec 1, 2012, at 11:39 PM, "shinyribs [via Honda CB750'S]" <[hidden email]> wrote:

Someone has mismatched then in the past I suppose. I wouldn't worry about it though. I don't know what the reason for the change in design was,but the early bikes don't seem to miss it.
Montvale,Virginia
Piute said it best: "wheres my 10mm?"
Hellbilly-"that is a great way to tell if you have come to your senses, when you start drilling random holes in things... "

LukeM-"Scooters rock, especially when they're in posse formation. "

Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
History teaches us that men and nations behave wisely once they have exhausted all other alternatives. ~ Abba Eban

If you reply to this email, your message will be added to the discussion below:
http://honda-cb750-s.456789.n3.nabble.com/Rocker-arm-holes-tp4032899p4032976.html

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NAML

No reason a CB 750 cant be your first bike at 15 years old!!

Dirty

Re: Rocker arm holes

In reply to this post by shinyribs

Shiny, now I see what you were talking about on those holes. i pulled apart my 75 motor and saw that these earlier motors have 2 bolts keeping rocker arm shafts from turning, along with one bolt holding shafts in. Late model engines only have one bolt holding shaft in. Thanks

No reason a CB 750 cant be your first bike at 15 years old!!

Lucky 1

Re: Rocker arm holes

In reply to this post by shinyribs

The 1977-1978 models had about 21 changes in them.

On a Roadstar Adventure.

shinyribs

Re: Rocker arm holes

Administrator

In reply to this post by Dirty

Dirty wrote

Shiny, now I see what you were talking about on those holes. i pulled apart my 75 motor and saw that these earlier motors have 2 bolts keeping rocker arm shafts from turning, along with one bolt holding shafts in. Late model engines only have one bolt holding shaft in. Thanks

Yeah man