Author Topic: '72 CB 750 - "Kinetic Aline"  (Read 41722 times)

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Offline Doctor_D

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #100 on: June 03, 2010, 08:24:48 AM »
i wouldnt worry that much about heat with the paint

+1, further black radiates better other colors, any insulating value should be offset by that fact.

Funny you should ask... I was just going to ask if anyone had suggestions for this.   :)

So can anyone recommend some different oil coolers and tell me where I can get one?

I just got a CB650 cooler on ebay for $19, with oil lines and the engine takeoff plate.  I'll likely use braided lines, AN fittings and a CycleX spin-on filter adapter that has the cooler take-offs on it -- unless I can find a nicer one.

Take care,
David
___________________________________________
1975 CB 750F - Project page: http://forums.sohc4.net/index.php?topic=66026.msg725479#msg725479
1978 CX500
1971 Norton Commando

Offline wannabridin

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    • 1976 CB750K, under construction:
Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #101 on: June 03, 2010, 09:23:55 AM »
i'm running this from cavebear.  i'm not 100% on the specifics, but it's a very nice setup, complete with adjustable mounts and everything.  i think a quick trip into the soda blaster followed by a once over with a radiator comb and some radiator paint will help make it practically brand new!  i also like it because the oil lines run up in between the pipes, making for a nice clean install
1976 CB750K, currently under construction:
http://forums.sohc4.net/index.php?topic=64468.0

-And if you don't do it this year, you'll be one year older when you do...

Offline fastbroshi

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #102 on: June 03, 2010, 10:25:55 AM »
  I think Rankakk's has one that will work, but I think one from the CB650 or 550SC would work.  Their coolers have the hoses come down to a little adapter that goes between the block and the filter cover.  I haven't verified this.
Just call me Timmaaaaay!!!

Offline sangyo soichiro

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #103 on: June 03, 2010, 11:15:52 AM »
  I think Rankakk's has one that will work, but I think one from the CB650 or 550SC would work.  Their coolers have the hoses come down to a little adapter that goes between the block and the filter cover.  I haven't verified this.

I never heard of this place, and Google doesn't give me anything.  Do you have a link for Rankakk?
1974 CB 750
1972 CB 750 http://forums.sohc4.net/index.php/topic,57974.0.html
1971 CL 350 Scrambler
1966 Black Bomber
Too many others to name…
My cross country trip: http://forums.sohc4.net/index.php/topic,138625.0.html

Offline wannabridin

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #104 on: June 03, 2010, 02:07:27 PM »
i think he meant Randakks

http://www.randakks.com/
1976 CB750K, currently under construction:
http://forums.sohc4.net/index.php?topic=64468.0

-And if you don't do it this year, you'll be one year older when you do...

Offline sangyo soichiro

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #105 on: June 05, 2010, 12:06:54 PM »
Thanks for that link WBR.


I measured the weight of all my rods today.  I wanted to see how the weight of the Cycle X rods compared to the other two stock sets I have.

Here are the results (in grams, bearings left out):
Stock set marked "F":  
356.9
357.4
357.7
357.2

357.2 (avg.)
Stock set marked "H":  
357.7
361.2
359.7
363.0

360.4 (avg.)
Cycle X Super Rods:
370.4
374.8
375.1
371.2

372.9 (avg.)


To put this in perspective, one nut from one of the old rods weighs 3.7 grams, and a bearing (both halves) weighs 23.0 grams.

Okay, so the Cycle X rods are heavier, but here's what really concerns me; the difference in weight between just the Cycle X rods (about 5 grams) is comparable to the weight of a nut (that is, the difference in weight is comparable to running a rod without one of its nuts)...

Not sure if I should take my pencil grinder and try to even them out (carefully, of course)...

Any thoughts?


Edit - Update on the rod situation:
I emailed Jake at CyX to ask their opinion.   They sent me out two rods at 371.3 and 371.4 grams, along with a packing slip to send back the two heavier rods.  So they took care of me.  And they will make sure that, from now on, the rods will all be matched.  They take care of their customers.
« Last Edit: June 18, 2010, 11:19:47 AM by soichiro »
1974 CB 750
1972 CB 750 http://forums.sohc4.net/index.php/topic,57974.0.html
1971 CL 350 Scrambler
1966 Black Bomber
Too many others to name…
My cross country trip: http://forums.sohc4.net/index.php/topic,138625.0.html

Offline Doctor_D

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #106 on: June 05, 2010, 09:33:27 PM »
You should have them balanced to 0.5g.

Also, you need to balance the big ends and the small ends.  First, you make sure all the small ends are balanced, then you weight the entire rod and balance them by taking weight off the big-end.
There are YouTube videos that demonstrate the process.

If you look on my project page, you'll see the balancing jig I put together to do it to my stock rods.
Take care,
David
___________________________________________
1975 CB 750F - Project page: http://forums.sohc4.net/index.php?topic=66026.msg725479#msg725479
1978 CX500
1971 Norton Commando

Offline sangyo soichiro

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #107 on: June 06, 2010, 11:26:23 AM »
Thanks Doctor_D (and MRieck and HondaMan, in PMs after I asked for their input).  I'll look into lightening them.




On to something I just saw... about that drilled clutch basket I have. 
I see that someone else has done it too.


http://www.classiccyclecity.com/gallery/displayimage.php?album=48&pos=3

1974 CB 750
1972 CB 750 http://forums.sohc4.net/index.php/topic,57974.0.html
1971 CL 350 Scrambler
1966 Black Bomber
Too many others to name…
My cross country trip: http://forums.sohc4.net/index.php/topic,138625.0.html

Offline Doctor_D

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #108 on: June 06, 2010, 12:17:55 PM »
 :D Just noticed that myself - though I've been to that page a number of times.

As long as I'm lightening rotating and reciprocating parts, I might as well weld the rivets and drill the basket. It'll give me something to do while waiting for a few more parts to arrive.
Take care,
David
___________________________________________
1975 CB 750F - Project page: http://forums.sohc4.net/index.php?topic=66026.msg725479#msg725479
1978 CX500
1971 Norton Commando

Offline sangyo soichiro

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #109 on: June 08, 2010, 09:14:25 AM »
A few more parts came in...

Progressive rear suspension:


Dyna 2000 ignition:


And fork ears from Mikes XS, and Magura clip-ons from forum member fastbroshi:




And a word of caution for you guys with your transmission in pieces...
Make sure the oil holes line up on those bronze bushings.  I'd hate to think what could happen if they didn't....
1974 CB 750
1972 CB 750 http://forums.sohc4.net/index.php/topic,57974.0.html
1971 CL 350 Scrambler
1966 Black Bomber
Too many others to name…
My cross country trip: http://forums.sohc4.net/index.php/topic,138625.0.html

Offline wannabridin

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    • 1976 CB750K, under construction:
Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #110 on: June 08, 2010, 10:37:43 AM »
looking GOOD!  can't wait until i can have piles of parts just waiting to go in...  slowly but surely.......
1976 CB750K, currently under construction:
http://forums.sohc4.net/index.php?topic=64468.0

-And if you don't do it this year, you'll be one year older when you do...

Offline michrobi

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #111 on: June 08, 2010, 10:42:46 AM »
Nothing like a huge satchel of brand new/machined performance engine components to make a guy feel just fine about life eh?   ;)
What did you decide on the trans bearings? I like those fork ears, I may need to secure myself a pair.

Pace yourself man, you and tweakn are making the rest of us look like slack Assses!   :D
-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 sangyo soichiro

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #112 on: June 08, 2010, 11:01:32 AM »
Nothing like a huge satchel of brand new/machined performance engine components to make a guy feel just fine about life eh?   ;)
What did you decide on the trans bearings? I like those fork ears, I may need to secure myself a pair.

Pace yourself man, you and tweakn are making the rest of us look like slack Assses!   :D


 :D

About the trans bearings...
I checked all the existing bearings and they seem as tight as when they were new.  No play at all, smooth motion, and spin freely.  And I kind of have a feel for these things left over from my tool and die days.  It's not about saving money or cutting corners... I just can't justify replacing them at this time.  The bearings that come off easily are not the problem, but the ones pressed on could turn into a serious PITA.  I could damage a good bearing taking it off, or putting the new one on.  Long story short, I'm sticking with the ones I have for the time being.  Again, it's not about cutting corners or budget concerns, it's just what I think is the right decision for me at this time.

I've also been talking it over with several forum members here (yourself included), and it goes both ways.  Jerry Rxman is thinking like me, and MCRider's opinion is that it's probably not necessary at this time.

In a few years I will split the cases again to check on my home-brewed trans undercutting and other modified parts, and I will revisit the decision to replace the trans bearings then.  That also played a role in my decision.



On another note, I think I just ordered the last of the parts I'll need for this build (er... except for something I just thought of.  D'oh!).  I ordered new primary chains, and the cam chain and primary tensioners.  I was going to stick with the ones I had, but decided, in this case, to just replace them.  Dynoman Performance is where I got these parts from.  I love that place.
1974 CB 750
1972 CB 750 http://forums.sohc4.net/index.php/topic,57974.0.html
1971 CL 350 Scrambler
1966 Black Bomber
Too many others to name…
My cross country trip: http://forums.sohc4.net/index.php/topic,138625.0.html

Offline jaguar

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #113 on: June 08, 2010, 11:15:58 AM »
are you going to run any resistors with the dyna and 3.0 ohms?
hondaman talked about needing them but im not sure

Offline sangyo soichiro

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #114 on: June 08, 2010, 11:20:41 AM »
are you going to run any resistors with the dyna and 3.0 ohms?
hondaman talked about needing them but im not sure

That's news to me...
I don't know anything about it.  I sort of assumed that Dynoman would supply everything I'd need - which is the unit itself, the coils (3 Ohm), and the suppression wires.  Maybe it's those wires that have the resistance built in or something....   

???
1974 CB 750
1972 CB 750 http://forums.sohc4.net/index.php/topic,57974.0.html
1971 CL 350 Scrambler
1966 Black Bomber
Too many others to name…
My cross country trip: http://forums.sohc4.net/index.php/topic,138625.0.html

Offline jaguar

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #115 on: June 08, 2010, 03:21:48 PM »
i have to look back at what all of the info was,
i think its all in one of hondamans threads about his ignition.
something about the lower then stock ohms
yeah you need to use suppresion wires if my memory serves me.

i bought a dyna 2000 and 2.2 coils a long time ago when they were having a fire sale.  hondaman made me these small reistor packs to use with the coils to make them work better.

did you get the cable to tune the curves on a PC?

Offline sangyo soichiro

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #116 on: June 08, 2010, 03:32:59 PM »
did you get the cable to tune the curves on a PC?


I'm not sure.  I'll have to check.
1974 CB 750
1972 CB 750 http://forums.sohc4.net/index.php/topic,57974.0.html
1971 CL 350 Scrambler
1966 Black Bomber
Too many others to name…
My cross country trip: http://forums.sohc4.net/index.php/topic,138625.0.html

Offline sangyo soichiro

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #117 on: June 09, 2010, 08:32:28 AM »
Bearings, bushings, and more bearings...







I ordered the crank bearings from Dynoman Performance, and the rest from PartsNMore.
1974 CB 750
1972 CB 750 http://forums.sohc4.net/index.php/topic,57974.0.html
1971 CL 350 Scrambler
1966 Black Bomber
Too many others to name…
My cross country trip: http://forums.sohc4.net/index.php/topic,138625.0.html

Offline wannabridin

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    • 1976 CB750K, under construction:
Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #118 on: June 09, 2010, 10:24:58 AM »
no swingarm rebuild from Hondaman?
1976 CB750K, currently under construction:
http://forums.sohc4.net/index.php?topic=64468.0

-And if you don't do it this year, you'll be one year older when you do...

Offline sangyo soichiro

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #119 on: June 09, 2010, 11:27:06 AM »
no swingarm rebuild from Hondaman?

I thought that's what I was doing.   ???  

Did I goof up with those bronze bushings?


[Edit:]  Aw dangit.  I now see HondaMan's swingarm service in the services offered section.  Damn.  I'm sorry I didn't pay attention before.  I had read the "Updating a CB 750" article in the forum (in the FAQ?), and was reminded of the bronze bushings for the swingarm.  I also remember reading something of HondaMan's about doing this.  I ran across those bushings while I was ordering other stuff and just grabbed them.  I'm feeling the pinch of the summer weather slipping away and am sort of in a rush.  I'm sorry HondaMan.  :(
« Last Edit: June 09, 2010, 11:37:14 AM by soichiro »
1974 CB 750
1972 CB 750 http://forums.sohc4.net/index.php/topic,57974.0.html
1971 CL 350 Scrambler
1966 Black Bomber
Too many others to name…
My cross country trip: http://forums.sohc4.net/index.php/topic,138625.0.html

Offline MCRider

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #120 on: June 09, 2010, 11:40:11 AM »
no swingarm rebuild from Hondaman?

I thought that's what I was doing.   ???  

Did I goof up with those bronze bushings?


[Edit:]  Aw dangit.  I now see HondaMan's swingarm service in the services offered section.  Damn.  I'm sorry I didn't pay attention before.  I had read the "Updating a CB 750" article in the forum (in the FAQ?), and was reminded of the bronze bushings for the swingarm.  I also remember reading something of HondaMan's about doing this.  I ran across those bushings while I was ordering other stuff and just grabbed them.  I'm feeling the pinch of the summer weather slipping away and am sort of in a rush.  I'm sorry HondaMan.  :(
If your swingarm is still going up and down and not sloppy side to side, you may want to put that on the back burner for next winter. If time is of the essence.
Ride Safe:
Ron
1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."

Offline sangyo soichiro

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #121 on: June 09, 2010, 11:57:13 AM »
no swingarm rebuild from Hondaman?

I thought that's what I was doing.   ???  

Did I goof up with those bronze bushings?


[Edit:]  Aw dangit.  I now see HondaMan's swingarm service in the services offered section.  Damn.  I'm sorry I didn't pay attention before.  I had read the "Updating a CB 750" article in the forum (in the FAQ?), and was reminded of the bronze bushings for the swingarm.  I also remember reading something of HondaMan's about doing this.  I ran across those bushings while I was ordering other stuff and just grabbed them.  I'm feeling the pinch of the summer weather slipping away and am sort of in a rush.  I'm sorry HondaMan.  :(
If your swingarm is still going up and down and not sloppy side to side, you may want to put that on the back burner for next winter. If time is of the essence.

I'll see if I have time in between waiting for parts.  But you're right.
1974 CB 750
1972 CB 750 http://forums.sohc4.net/index.php/topic,57974.0.html
1971 CL 350 Scrambler
1966 Black Bomber
Too many others to name…
My cross country trip: http://forums.sohc4.net/index.php/topic,138625.0.html

Offline sangyo soichiro

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #122 on: June 10, 2010, 07:57:38 AM »
Got the tires in today yesterday - Avon Roadriders.



We get lots of inquiries about tires in this forum - people wanting to know sizes and such.  These are the stock sizes for a K2; 3.25" x 19" front, and 4.00" x 18" rear.
1974 CB 750
1972 CB 750 http://forums.sohc4.net/index.php/topic,57974.0.html
1971 CL 350 Scrambler
1966 Black Bomber
Too many others to name…
My cross country trip: http://forums.sohc4.net/index.php/topic,138625.0.html

Offline sangyo soichiro

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #123 on: June 11, 2010, 11:37:46 PM »
Lookey what I got in the mail today...



I had Scott do them.  His listing is here:
http://forums.sohc4.net/index.php?topic=67540.0

Needless to say, I'm very happy.  They look great.  The day he got them in the mail he worked on them and got them done.  Great communication and service.  I'll do him a proper endorsement tomorrow when I'm not so tired.

120 holes.  Resurfaced.  Painted.  Weight savings of a little over 0.5 lb.  Reduced moment of inertia.

Now all I need is another caliper and brake assembly for a K2....
1974 CB 750
1972 CB 750 http://forums.sohc4.net/index.php/topic,57974.0.html
1971 CL 350 Scrambler
1966 Black Bomber
Too many others to name…
My cross country trip: http://forums.sohc4.net/index.php/topic,138625.0.html

Offline sangyo soichiro

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Re: '72 CB 750 vintage sportbike (Update: Phase II - engine work)
« Reply #124 on: June 12, 2010, 09:07:34 PM »
Truing wheels is... painful.  An exercise in... frustration.  Hard on the fingertips.  Tiring.  Tedious.  [Insert a general negative adjective here].

We need a little yellow emoticon face that's tired and laying on his back.
1974 CB 750
1972 CB 750 http://forums.sohc4.net/index.php/topic,57974.0.html
1971 CL 350 Scrambler
1966 Black Bomber
Too many others to name…
My cross country trip: http://forums.sohc4.net/index.php/topic,138625.0.html