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Author Topic: CB750 Head and bore (machine work) & 836 options  (Read 11405 times)

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Offline michrobi

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #25 on: June 17, 2009, 08:18:35 AM »

My dad and his partner Bob Lemon raced the hell out of it before I took it off his hands when I turned 18. My dad was always complaining that it needed a 6th gear.
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-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #26 on: June 17, 2009, 09:56:34 AM »
Since someone else mentioned W & S.......

I bought a "new" starter cover from them off EBay. You guessed it - obviously used. Complained to them. They said they must've shipped the wrong one and they'd ship a "new" one. Musta thought I was stupid because the frauds shipped... you guessed it again - another used one that they polished up. Got my money back. Anyone need a "new"  ::) starter cover?
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As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline BLUE71TURBO

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #27 on: June 17, 2009, 10:57:08 AM »
HEY MICHROBI !  I sent ya a pm.  Please let me know if yer interested. Thanks, JON G.
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Offline michrobi

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #28 on: June 17, 2009, 08:50:58 PM »
 :D :D :D :D

You guys are killin me. I don't have the Cobra, so I can't part it out even if I wanted to hehhe. I'll see what my dad's all about and if I get it I'll share the discoveries.  8)
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-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline michrobi

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #29 on: June 17, 2009, 10:14:39 PM »

Are a new NOS pair of primary chains worth $170?
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-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #30 on: June 17, 2009, 10:22:55 PM »
Hell NO!

You looking at these from the Honda Stealer on EBay? That guy pisses me off!

$86.72 from www.ServiceHonda.com. What most people don't realize is that even though the parts list says TWO are required and the parts list shows 1, that 1 is ONE SET OF TWO.

Keep asking questions. We've been around the block a few times.

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As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline michrobi

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #31 on: June 17, 2009, 11:00:58 PM »
ooh! glad I didn't get em. Yeah epay.
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-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline michrobi

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #32 on: June 18, 2009, 10:50:05 AM »
I think I have my pricing figured out, and here it is...

1290.00   Stage 3 head with all the trimmings
  204.50  41a Hard Weld CAM
   30.00   HD CAM chain
 240.00    Cylinder bore
 450.00    JE 836 kit
   30.00   20 CFM Head Gasket
   60.00   Gasket set
   90.00   Primary Chains
  225.00  Lighten & Balance crank
  290.00  Undercut & beadblast trans
  125.00  Dyna-S
  126.00  Dyna DC-1 coils
    17.00  Ignition wires
    80.00  HD Cylinder studs
  125.00   Shot peen stock rods

= 3382.50
+~600.00 shipping costs

so about $1500 over my budget     :'(
« Last Edit: June 18, 2009, 11:25:38 AM by michrobi »
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-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline NitroHunter

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #33 on: June 18, 2009, 12:41:29 PM »
It's only money... ::)
Good flow from that head gasket.  ;D
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Offline MRieck

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #34 on: June 18, 2009, 01:56:55 PM »
Quote from: michrobi on June 18, 2009, 10:50:05 AM
I think I have my pricing figured out, and here it is...

1290.00   Stage 3 head with all the trimmings
  204.50  41a Hard Weld CAM
   30.00   HD CAM chain
 240.00    Cylinder bore
 450.00    JE 836 kit
   30.00   20 CFM Head Gasket
   60.00   Gasket set
   90.00   Primary Chains
  225.00  Lighten & Balance crank
  290.00  Undercut & beadblast trans
  125.00  Dyna-S
  126.00  Dyna DC-1 coils
    17.00  Ignition wires
    80.00  HD Cylinder studs
  125.00   Shot peen stock rods

= 3382.50
+~600.00 shipping costs

so about $1500 over my budget     :'(

  A budget is merely a starting point I've always said. ;)
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Offline michrobi

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #35 on: June 18, 2009, 02:15:51 PM »
Well, I thought I could extend my budget with some smooth talkin, but she said "no!" in that one voice (you know the one).

So here is my revision of the list that keeps me under budget...

  820.00   Stage 2 head with springs, guides and new KPMI valves
  204.50  41a Hard Weld CAM
   30.00   HD CAM chain
 240.00    Cylinder bore
 450.00    JE 836 kit
   60.00   Gasket set
   90.00   Primary Chains
  125.00  Dyna-S
  126.00  Dyna DC-1 coils
    17.00  Ignition wires
    80.00  HD Cylinder studs
  125.00   Shot peen stock rods

= 2367.50
 +~200 shipping costs

$2567.50 ish

Do you guys agree with this being the right compromises? Or should I keep the 736 pistons, hone/ring those and get the Stage 3 headwork like this...

1290.00   Stage 3 head with all the trimmings
  204.50  41a Hard Weld CAM
   30.00   HD CAM chain
   60.00   Gasket set
   90.00   Primary Chains
  290.00  Undercut & beadblast trans
  125.00  Dyna-S
  126.00  Dyna DC-1 coils
    17.00  Ignition wires

= 2232.50
 +~350 shipping costs

$2582.50ish for this one.

How bout it?
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-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline mlinder

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #36 on: June 18, 2009, 02:18:08 PM »
Personally, I'd do the stage 3 with 736 pistons and a decked head, for a bit more compression. I do enjoy the 750 at 9k rpm, though. Some like a bit more power on the low end.
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Offline MRieck

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #37 on: June 18, 2009, 02:19:29 PM »
Quote from: michrobi on June 18, 2009, 02:15:51 PM
Well, I thought I could extend my budget with some smooth talkin, but she said "no!" in that one voice (you know the one).

So here is my revision of the list that keeps me under budget...

  820.00   Stage 2 head with springs, guides and new KPMI valves
  204.50  41a Hard Weld CAM
   30.00   HD CAM chain
 240.00    Cylinder bore
 450.00    JE 836 kit
   60.00   Gasket set
   90.00   Primary Chains
  125.00  Dyna-S
  126.00  Dyna DC-1 coils
    17.00  Ignition wires
    80.00  HD Cylinder studs
  125.00   Shot peen stock rods

= 2367.50
 +~200 shipping costs

$2567.50 ish

Do you guys agree with this being the right compromises? Or should I keep the 736 pistons, hone/ring those and get the Stage 3 headwork like this...

1290.00   Stage 3 head with all the trimmings
  204.50  41a Hard Weld CAM
   30.00   HD CAM chain
   60.00   Gasket set
   90.00   Primary Chains
  290.00  Undercut & beadblast trans
  125.00  Dyna-S
  126.00  Dyna DC-1 coils
    17.00  Ignition wires

= 2232.50
 +~350 shipping costs

$2582.50ish for this one.

How bout it?
I would stick with the first list which includes the 836 kit
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Offline mlinder

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #38 on: June 18, 2009, 02:20:22 PM »
Mike is smarter than me, so I'd listen to him :)
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Offline MRieck

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #39 on: June 18, 2009, 02:23:40 PM »
 I would also step up the cam....the 41A is pretty mild. Same price for a more aggresive Web cam so it's a win/win deal. ;) You will need the 836 kit for a heavier cam.
« Last Edit: June 18, 2009, 02:33:10 PM by MRieck »
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Offline MRieck

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #40 on: June 18, 2009, 02:24:17 PM »
Quote from: mlinder on June 18, 2009, 02:20:22 PM
Mike is smarter than me, so I'd listen to him :)
I don't know about the Mark. ;) ;)
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Offline michrobi

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #41 on: June 18, 2009, 02:36:57 PM »
I thought I was being smart sticking with a hard weld, but yeah I keep looking at the .370 63b with the 268° @ .050. Now that you say that - I'll go with the 63b  ;D

Check yer email Mike   ;)
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-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline michrobi

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #42 on: June 18, 2009, 02:42:52 PM »

And are the JE kits THAT much better than Wiseco? I can get a Wiseco kit with a 20 CFM gasket included for 399 from cycle x
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-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline MRieck

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #43 on: June 18, 2009, 03:07:31 PM »
Check your email Mike
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Offline 754

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #44 on: June 18, 2009, 04:23:42 PM »
Not sure what J&E look like. but Wiseco look sort of plain, cant say which is better..

 The only reason I can find to stay at 736cc is for class racing, or to be able to say, I can easily make this bigger.

 I suspect if you priced stock os pistons and new rings, you may loose interest in that route quickly..

 Nuthin wrong with a bit more comprssion, if you can still run regular..


( i could really use a 327 cam BTW...)
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My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline mlinder

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #45 on: June 18, 2009, 04:27:07 PM »
I disagree that it's the 'only' reason, but I defer to the 'real' old timers (not of age, or the 'title' we get here, but to experience) here in terms of making a tractable, good all around high powered bike.
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Offline 754

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #46 on: June 18, 2009, 04:49:05 PM »
I will admit, the 736 is better for parade use..

 I am only speaking for personal view, but for the money, I have found the bore kit, gives the greater increase, over a wider range, than some other mods.. but yes a cam is cheaper.. but will shift the gains more to one end of your operating range..
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dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline scondon

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #47 on: June 18, 2009, 05:12:08 PM »
Quote from: MRieck on June 18, 2009, 02:19:29 PM
Quote from: michrobi on June 18, 2009, 02:15:51 PM
Well, I thought I could extend my budget with some smooth talkin, but she said "no!" in that one voice (you know the one).

So here is my revision of the list that keeps me under budget...

  820.00   Stage 2 head with springs, guides and new KPMI valves
  204.50  41a Hard Weld CAM
   30.00   HD CAM chain
 240.00    Cylinder bore
 450.00    JE 836 kit
   60.00   Gasket set
   90.00   Primary Chains
  125.00  Dyna-S
  126.00  Dyna DC-1 coils
    17.00  Ignition wires
    80.00  HD Cylinder studs
  125.00   Shot peen stock rods

= 2367.50
 +~200 shipping costs

$2567.50 ish

Do you guys agree with this being the right compromises? Or should I keep the 736 pistons, hone/ring those and get the Stage 3 headwork like this...

1290.00   Stage 3 head with all the trimmings
  204.50  41a Hard Weld CAM
   30.00   HD CAM chain
   60.00   Gasket set
   90.00   Primary Chains
  290.00  Undercut & beadblast trans
  125.00  Dyna-S
  126.00  Dyna DC-1 coils
    17.00  Ignition wires

= 2232.50
 +~350 shipping costs

$2582.50ish for this one.

How bout it?
I would stick with the first list which includes the 836 kit

I'll agree with ya, Mike. I ran this set-up with a 63a grind cam and it was great bang for the buck. Sneak in a Dyna 2000 ignition, and ask for 29mm CR carbs for Christmas.
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Offline Sam Green Racing

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #48 on: June 18, 2009, 05:19:41 PM »
31 ::) ::) ::) ::) ::) ::) ::)
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Offline michrobi

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Re: CB750 Head and bore (machine work) & 836 options
« Reply #49 on: June 18, 2009, 05:34:02 PM »
My dad raced the Mikuni's tho man. How many CB's have kuni's strapped on em? Well okay, maybe a few - but the nostalgia of these carb's is too great to even consider changing them out. They're old but they're good 'n old   ;D

You guys hear something?    ;)
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-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?
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