Author Topic: Performance of a k1 versus k8 CB750, much difference?  (Read 17086 times)

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eldar

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #25 on: February 06, 2009, 07:50:03 AM »
Possible, hard to say. I have never tried to redline like that as I have never replaced a gasket in the bikes 32 years. But I would be pretty sure it would do the same in third.

As for the yawning chasm, well ever model ran has to end doesnt it. Name one model that has not ended? Honda obviously could not keep making an sohc forever not when everyone else was doing duals. So I think that theory is empty air. :D

Besides, bobby has it right. If you want to build the best sohc motor you can, you use the k8 head as it is the best of the years, probably extends to the whole engine other than the A's hi-vo primary. Besides that, the different years present 2 different eras in bike design. 69-76, quaint older styles. 77/78 are more modern and clearly the style was good as the early 80s followed the same lines with the basic style staying till the sabre came out in 84. I suppose the magna was also different but it kinda went along chopper lines a little.

Now before mohan tries to say the 77/78 were diluted in looks, remember, the 350,400,500,550, and 750 styles between 69-76 had a lot of the same looks too.

Bottom line is us 77/78 owners like our rides just as much and will defend them just as much. We are just a smaller group since our style was made for 2 years as opposed to 7. What owners of the 69-76 seem to forget is the engines look the same, as well as a number of other parts.

I guess I just wonder why so many think the later years were slower when it just is not true. I guess old myths based upon looks die very hard. A symptom of closed minds perhaps? 8)

Offline 754

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #26 on: February 06, 2009, 08:05:46 AM »
All here on a 76 or earlier 750 that have been passed by a 77/78 750 raise their hands.

All here on a 77/78 750 that have been passed by an earlier  model raise your hands.

======================================

If the 77/78 are so smokingly fast, how is it that so many of the owners are still riding around with single disc front end... ???
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Offline fishhead

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #27 on: February 06, 2009, 08:16:21 AM »
  I've been told that the K8 was aimed at the women bikers and sissys.

By the time the K8 came out, of all of the real men already had a "manly" bike (like the earlier 750 K models), so they changed their sales focus on selling them to women and sissys, and that's why you only see sissys and women riders on the K8's.

 Or at least thats what I have been told....
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Offline moham

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #28 on: February 06, 2009, 08:21:34 AM »
Now before mohan tries to say the 77/78 were diluted in looks, remember, the 350,400,500,550, and 750 styles between 69-76 had a lot of the same looks too.
I will say no such thing. While it does not share the same vintage styling as previous models, the Ocho has it's own visual appeal, highlighted by clean fork legs, trim lines on the tank and groovy exhaust.

Bottom line is us 77/78 owners like our rides just as much and will defend them just as much. We are just a smaller group since our style was made for 2 years as opposed to 7.
I guess that makes me an anomaly as I now own both ends of the spectrum a K8 with 7,000 miles and an 811cc K0 (motor not yet in a frame...)

I guess I just wonder why so many think the later years were slower when it just is not true. I guess old myths based upon looks die very hard. A symptom of closed minds perhaps? 8)
I don't really know which one is faster, I just love jumping into unwinnable semantic battles about completely subjective topics...
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74 550-The Cherry Picker
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Offline 754

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #29 on: February 06, 2009, 08:22:25 AM »
 ;D..laughing my ass off..!! :o   :o

 That first paragraph of the second last post, is the funniest thing I have seen on here...




BTW, I have owned a 77K motor and ran it quite a while, and I have 2 78F motors right now..
« Last Edit: February 06, 2009, 08:26:41 AM by 754 »
Maker of the WELDLESS 750 Frame Kit
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 Kev Nemo

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #30 on: February 06, 2009, 08:28:48 AM »
so the stock mains on a '78 cb750k were 110, earlier models were 120. What exhaust set-up are we talking here, 4-4?
« Last Edit: February 06, 2009, 08:38:54 AM by Kev Nemo »
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Offline moham

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #31 on: February 06, 2009, 08:32:45 AM »
and that's why you only see sissys and women riders on the K8's.

I knew something was different when I woke up this morning...
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Offline cafe750

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #32 on: February 06, 2009, 09:43:20 AM »

I guess I just wonder why so many think the later years were slower when it just is not true. I guess old myths based upon looks die very hard. A symptom of closed minds perhaps? 8)
I don't really know which one is faster, I just love jumping into unwinnable semantic battles about completely subjective topics...


 :D....we should all be okay as long as we don't bring V65 Sabres into the conversation.... ::)
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Offline BeSeeingYou

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #33 on: February 06, 2009, 05:31:07 PM »
Kind of like arguing what color is better, red or blue?  It seems to boil down to what one considers the best is what one owns.  It does seem logical to assume that the bike evolved and improved over the course of the model run otherwise it would be hard for Honda to stay in business if it went the other way.

Offline coyotecowboy

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #34 on: February 06, 2009, 05:52:47 PM »
Things had a tendency to de-evolve during the mid 70's.

Case in point: 1970 Chevelle SS454 with the LS6.  450+ HP of shag-nasty, tire melting, hair raising, hi-test only swilling ATTITUDE!!

Gas crunch came along, Coporate Average Fuel Economy (CAFE) standards ruled the day, and cars like this disappeared from the showrooms.

Similar thing happened to bikes, not on such a grand scale, but Big Brother shook his finger and the cycle maunfacturers sat up and listened.






Now I honestly don't give a damn one way or the other if a 78K made more HP than a 70K, or vice versa.  You're comparing stock to stock.  I've never left anything stock.  It's mine and I'll modify it how I see fit.  If your 77-78K can smoke my K2, then rock on!  Show me how you did it and I'll learn something.  I might smoke you next time. ;)
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #35 on: February 06, 2009, 06:38:25 PM »
BLUE, with out a doubt!!

Especially a 75 750F Candy Sapphire Blue that definitely had THE best 750 head. Those damn 78 K buffaloes wouldn't be here without the 75 F -392 head. 392 MEANS 75 F. Eldie, check the number on your head bro. It says "-392" and probably had to have K8 hand stamped into it to say "I'm just the little red headed step brother of the true -392, the mighty '75 F".    ;D
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline ekpent

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #36 on: February 06, 2009, 07:23:18 PM »
I know I am kind of a nobody here in your world but the thing I have always liked about the old SOHC 750 is the low end grunt it gives. Redline is fine but it feels good to roll on at 2 or 3 and get going.Good low end power is nice on the road and if you happen to race a 78 it might just depend on a shift,or who is willing to take that tach for a ride.When I had my first 836 kit I was always fishing for another gear,even in 5th because the low end was there. We are not a V-65 or a V-max but everybody give me a good grunt----------- :D

Offline seaweb11

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #37 on: February 06, 2009, 07:25:24 PM »
I believe it may come down to............




Who FUKCING CARES  ??

......just ride and smile ;D

Offline GammaFlat

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #38 on: February 06, 2009, 07:35:22 PM »
This topic belongs in the "unstoppable force vs. immovable object" section of the forum. 
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Offline BobbyR

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #39 on: February 06, 2009, 07:35:45 PM »
I believe it may come down to............




Who FUKCING CARES  ??

......just ride and smile ;D

+2 Amen
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #40 on: February 06, 2009, 08:24:21 PM »
I believe it may come down to............






Who FUKCING CARES  ??

......just ride and smile ;D

+2 Amen

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

Offline moham

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #41 on: February 07, 2009, 05:37:01 AM »
I believe it may come down to............






Who FUKCING CARES  ??

......just ride and smile ;D

+2 Amen

Exactly....................

Uhhh, the guy who asked the question, perhaps?? And the others that had input/opinions on the subject? If some of you can't be bothered because it's "So Frikkin' Booooooring/Stupid", then perhaps you'd be interested in some of our other fascinating threads, for instance:

a) "Jetting with individual filters and exhaust..."

b)" parts site"

or my personal favorite for 7 pages of useless rantings   

c) "Anubis Cycle - Out of Business?"

78 750K-The Ocho
74 550-The Cherry Picker
70 750K0 motor-Dick in a Box

Offline Bob Wessner

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #42 on: February 07, 2009, 05:40:39 AM »
Good advice on any thread. If it is of no interest to you move on to another thread that is.
We'll all be someone else's PO some day.

Offline 78CB750CAFE

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #43 on: February 07, 2009, 07:26:28 AM »
"much" difference? probably not. Some difference, I am sure there is. Do they all have the potential to be faster then stock, yes. I love my K8, as I did my K2 and K4, and the 400's and 500's I have owned.
To me the K8 was the final refinement of the bike with some things that were improvements, and a few things that were done to please big brother and hurt performance. Most the things that were done to help emissions that actually negatively affected performance can be changed easily, except the compression ratio and cam profile. For me one of the biggest improvements to the K7/8 was the accelerator pump carbs. Is there one best year/model? of course there is... the one in your garage right now, why aren't you out riding it instead of arguing about its merits or some other models failings? For 30+ year old bikes they all were fast and still can be fast. Prove it to yourself by hopping on yours and scaring yourself a little this weekend, consider that an order.

I am headed out to Skyline Drive in about an hour with my riding buddys to do just that.
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Offline Hockers Choppers

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #44 on: February 07, 2009, 07:35:21 AM »
I believe it may come down to............






Who FUKCING CARES  ??

......just ride and smile ;D

+2 Amen

Exactly....................

Uhhh, the guy who asked the question, perhaps?? And the others that had input/opinions on the subject? If some of you can't be bothered because it's "So Frikkin' Booooooring/Stupid", then perhaps you'd be interested in some of our other fascinating threads, for instance:

a) "Jetting with individual filters and exhaust..."

b)" parts site"

or my personal favorite for 7 pages of useless rantings   

c) "Anubis Cycle - Out of Business?"






OH MY........Anubis Cycle is Out of Business!!!

what jets ARE You running in your bike?

The thing about common sense is that, it's not that common.

1978 CB750F SUPERSPORT 850cc, cam, porting, dyna ign, cr29's lotsa elbow grease and $$'s. Worth ever penny!!  (S0ld)

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cb750 k1

Offline BobbyR

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #45 on: February 07, 2009, 08:44:01 AM »
OK, I figured out how to determine the best SOHC bike.

After you have finished a nice satisfying ride with no incidents, get off the bike. Take a close look at the plate on the headstock. That will tell you in an instant. 
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Offline BeSeeingYou

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #46 on: February 07, 2009, 09:59:39 AM »
BLUE, with out a doubt!!

Especially a 75 750F Candy Sapphire Blue that definitely had THE best 750 head. Those damn 78 K buffaloes wouldn't be here without the 75 F -392 head. 392 MEANS 75 F. Eldie, check the number on your head bro. It says "-392" and probably had to have K8 hand stamped into it to say "I'm just the little red headed step brother of the true -392, the mighty '75 F".    ;D

I do like the blue color. The 76 F that I am trying to get is red.  I do think the SS looks better with the side covers painted the same color and not the stock grey.  After a bit of research I decided that a 75-76 F was the choice for me having the best combinations of things I was looking for.  So cheers for the "mighty 75 and 76 F"  ;D

A similar argument goes on over at the XS650 forum.  The early XS650's 70-73 were lighter and maybe a wee bit more power but had bad road manners.  By many accounts they were the best looking of the series.  In 74 the frame was improved and in 77 the fork was improved making the newer bikes the best handling of the series even though they were heavier and a wee bit slower.  Which is better depends on what you want and expect from your ride.  The handling quirks of the early bikes are well documented in the road test evaluations of the time though it seems many who own them seldom admit to this.  Human nature I guess ;D
« Last Edit: February 07, 2009, 10:04:52 AM by srust58 »

Offline 754

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #47 on: February 07, 2009, 10:05:08 AM »
Either that, or they modded it to meet or exceed the performance, any of the stock offerings ever had...
Maker of the WELDLESS 750 Frame Kit
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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

Texwing

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #48 on: February 07, 2009, 12:24:26 PM »
Wow, I am kinda worried about identifying myself as the guy who started the thread...lucky I did not add "and what kind of motor oil should I use?" or I might be tracked down and killed.  Anyway, thanks for all the info.  Foolishly, I dont remember what Jets are in my K1 with its 4 into 1 header, but it runs crisp and clean through the band with no sign of lean  behavior or bright blue chrome at the heads.  Actually, now that I am thinking about it,  will stock jets with a 4 into 1 header actually make a bike slower than stock jets with a stock exhaust?   But I will check, because the K8 really seemed seat of the pants stronger, even with its ratty stock exhaust, and I am gleaning from the 300 posts that no really big difference should exist.  Thanks for all the replies.

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Performance of a k1 versus k8 CB750, much difference?
« Reply #49 on: February 07, 2009, 01:15:48 PM »
OIL!!   Oh yeah, it's oil time.....  :o  ;D  ;)
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)