Vintage and Classic Hondas

Engine and trans. overhaul

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Elliot Cannon
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Engine and trans. overhaul

Elliot Cannon
I've put obout 75 miles since buying a new (to me) 1975 cb 750.  It has about 67,000 miles on it and the bike is constantly showing me how old it is.  The transmission especially.  Is there any one on the west coast that overhauls these engines and transmissions?  Is it worth it to overhaul one or buy one already done?    
Maintain thy airspeed, lest the ground arise and smyte thee.
A mile of highway will take you one mile.  A mile of runway will take you anywhere.
seestheday
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Re: Engine and trans. overhaul

seestheday
I believe that CycleX is on the west coast and has an engine exchange program: http://www.cyclexchange.net/StreetFighter%20Motor%20Page.htm (scroll down and look at budget engines).

That said, $2500-$3000 is too much for a bike that I paid $700 for.  It's up to you.  You'd basically end up with a new engine/transmission though.  I've only heard good things about the cycle x stuff, but it is pricey IMO.

Also, are you sure your current engine isn't having some simple problems you could fix yourself?
1981 CB750K with 900 cams
90K KM's, rebuilt head, rebuilt carbs, upgraded valve stem seals

My wife's recipe website that I'm trying to help promote: Strawberries for supper. Yes, I am a lucky man.

Elliot Cannon
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Re: Engine and trans. overhaul

Elliot Cannon
The engine seems to be running OK.  I haven't been on a bike in 35 years, so I don't really have anything to compare it to.  My last bike was a 350.  The transmission bangs and clanks going into gear and sometimes it will not go into gear during upshift.  It feels like it is in between gears or something.  I try to shift with a positive motion but it still sometimes when I release the clutch that I'm in neutral during a shift from 3rd to 4th or 2nd to 3rd.  For that much money though, maybe I'll just put up with it.  
Maintain thy airspeed, lest the ground arise and smyte thee.
A mile of highway will take you one mile.  A mile of runway will take you anywhere.
TOOLS1
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Re: Engine and trans. overhaul

TOOLS1
Administrator
Sounds like a clutch problem. It might be ready, for a new one.
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)
Piute
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Re: Engine and trans. overhaul

Piute
In reply to this post by seestheday

                        Cycle-X is in Wisconsin Hazelhurst
                            1977 CB750 F2 Super Sport
<LET THOSE WHO RIDE DECIDE><RIDE TO LIVE-LIVE FOR JESUS> 
Native American from central Cal,  Kickstand UP in S.W.Missouri,
                                       
 
seestheday
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Re: Engine and trans. overhaul

seestheday
In reply to this post by TOOLS1
I defer to tools, but a cheap thing to try might be an oil change? have you tried running a good synthetic?

I thankfully haven't needed a new clutch, but I think I recall hearing that new dohc clutches are hard to come by. There is always fleabay though.
Sent from my BlackBerry device on the Rogers Wireless Network
From: "TOOLS1 [via Honda CB750'S]" <[hidden email]>
Date: Mon, 1 Oct 2012 16:44:01 -0700 (PDT)
To: seestheday<[hidden email]>
Subject: Re: Engine and trans. overhaul

Sounds like a clutch problem. It might be ready, for a new one.
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
1976 CB 750-A X 2
1977 CB 750-A X 2
1977 CB 750-K
1981 CB 750
1995 KZ 1000 P-14
1981 KZ 750 LTD X 2
1973 CB 350
1979 CM 185 Twinstar
1987 Honda TLR 200
1982 Honda XL 80
South of Edan (Kansas City MO)


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NAML
1981 CB750K with 900 cams
90K KM's, rebuilt head, rebuilt carbs, upgraded valve stem seals

My wife's recipe website that I'm trying to help promote: Strawberries for supper. Yes, I am a lucky man.

seestheday
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Re: Engine and trans. overhaul

seestheday
In reply to this post by Piute
Interesting. Not sure why I thought they were west coast.

Thanks Piute
Sent from my BlackBerry device on the Rogers Wireless Network
From: "Piute [via Honda CB750'S]" <[hidden email]>
Date: Mon, 1 Oct 2012 16:45:28 -0700 (PDT)
To: seestheday<[hidden email]>
Subject: Re: Engine and trans. overhaul


                        Cycle-X is in Wisconsin Hazelhurst
                            1977 CB750 F2 Super Sport
<LET THOSE WHO RIDE DECIDE><RIDE TO LIVE-LIVE FOR JESUS> 
Native American from central Cal,  Kickstand down in S.W.Missouri,
                                       
 


If you reply to this email, your message will be added to the discussion below:
http://honda-cb750-s.456789.n3.nabble.com/Engine-and-trans-overhaul-tp4030144p4030169.html
To unsubscribe from Engine and trans. overhaul, click here.
NAML
1981 CB750K with 900 cams
90K KM's, rebuilt head, rebuilt carbs, upgraded valve stem seals

My wife's recipe website that I'm trying to help promote: Strawberries for supper. Yes, I am a lucky man.

riedling
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Re: Engine and trans. overhaul

riedling
I would do two things before changing a tranny on these..

1.  run seafoam in the crankcase for 5 minutes at idle while shifting back and forth through the gears. This will get any carbon off the splines and shifter drum. Make sure to change the oil IMMEDIATELY after this procedure (including the filter)

2.  Change the shifter drum.  This is the piece that has the "pattern" in it that moves it all around.. Whit excesseve wear, this might explain your issue.  These gears are very tough, i doubt yours are hosed in some way.

Just a hillbilly's two cents, your results may vary :)
1979 CB750K
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