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Author Topic: These cb750s rip!!!  (Read 2184 times)

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Offline colvinry

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These cb750s rip!!!
« on: August 04, 2016, 04:27:37 PM »
So I have been building a 78 cb750 f'er for the past 2 years on and off. Just finished fully tuning my carbs. I will post settings when I can confirm. Had the same setup with out vac sync, just a bench sync. I had problems with low throttle response. Vac sync'd them and that cleared right up. She pulls really nice now. Really good transitions, no dead spots. I was really surprised when I did some pulls. Figured out how 70s brakes work. Lol. Not great. So pumped though. My seat is on some wooden guides and the seat was sliding when I started getting into the torque Rpms. Need to bolt that thing down.

Also put some hagons twin shocks (219) on the back and it feels so much better than my frozen up stockers. Might be a bit soft but I need to tune them in a bit.



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Offline madmtnmotors

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Re: These cb750s rip!!!
« Reply #1 on: August 04, 2016, 05:06:07 PM »
There's no hope for you now... you've been bitten...

Welcome to the club!
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Wilbur



Projects:
"Evolution": http://forums.sohc4.net/index.php?topic=100352.0
"P.O. Debacle": http://forums.sohc4.net/index.php/topic,126692.msg1441661.html#msg1441661
F2/F3 O-rings: http://forums.sohc4.net/index.php?topic=113672.msg1300721#msg1300721
Cam Tower Studs: https://www.mcmaster.com/#93210a017/=t19sgp
Clean up that nasty harness: http://forums.sohc4.net/index.php?topic=137351.msg1549191#msg1549191
http://forums.sohc4.net/index.php/topic,148188.msg1688494.html#msg1688494
http://forums.sohc4.net/index.php/topic,139544.msg1579364.html#msg1579364
                                          
Charging system diagnosis: http://forums.sohc4.net/index.php?topic=1012.msg8345#msg8345
Get the manuals: http://manuals.sohc4.net/cb750k/
The Dragon: http://forums.sohc4.net/index.php?topic=45183.msg1571675#msg1571675
Headlight Switch: http://forums.sohc4.net/index.php?topic=113986.msg1283236#msg1283236
Branden's leak free top end thread: http://forums.sohc4.net/index.php?topic=107040.0
Engine Lifting Made Easy: http://forums.sohc4.net/index.php/topic,58210.msg1684742.html#msg1684742
                                      http://forums.sohc4.net/index.php/topic,100352.msg1675840.html#msg1675840
Static and Dynamic Timing: http://www.hondachopper.com/garage/carb_info/timing/timing1.html
Airbox Gasket Replacement: http://forums.sohc4.net/index.php/topic,114485.msg1290000.html#msg1290000
"Café" : http://forums.sohc4.net/index.php/topic,84697.msg953814.html#msg953814
PD Carb Choke Linkage: http://forums.sohc4.net/index.php/topic,100352.msg1669248.html#msg1669248
                                    http://forums.sohc4.net/index.php/topic,110931.msg1248354.html#msg1248354
                                    http://forums.sohc4.net/index.php/topic,48858.msg515204.html#msg515204
Follow up on your damn posts: http://forums.sohc4.net/index.php/topic,144305.msg1791605.html#msg1791605
Taiwanese Cam Chain Tensioners:  http://forums.sohc4.net/index.php/topic,155043.msg1774841.html#msg1774841
Gumtwo Seat Cover: http://forums.sohc4.net/index.php/topic,164440.msg1897366.html#msg1897366
Primary Drive: http://forums.sohc4.net/index.php/topic,166063.msg1919278.html#msg1919278
Tank Latch: http://forums.sohc4.net/index.php/topic,165975.msg1919495.html#msg1919495
Shorten your forks: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-shorten-forks-td4042465.html DO NOT CUT THE SPRINGS!
Clutch How To: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-change-and-adjust-a-clutch-SOHC-td4040391.html
Late model K7/K8/F2/F3 front sprocket cover removal: http://forums.sohc4.net/index.php/topic,178428.msg2072279.html#msg2072279
630 to 530 conversion: http://forums.sohc4.net/index.php/topic,180710.msg2094423.html#msg2094423

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Offline Mantree

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Re: These cb750s rip!!!
« Reply #2 on: August 04, 2016, 05:06:21 PM »
I once took my 74 up to 115 before I remembered that I had brakes built in the 70s and thought it best to back off the throttle 

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Offline colvinry

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Re: These cb750s rip!!!
« Reply #3 on: August 04, 2016, 08:00:12 PM »
I think I need longer gears in the back to get up there.


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Offline colvinry

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Re: These cb750s rip!!!
« Reply #4 on: August 04, 2016, 08:02:02 PM »
https://drive.google.com/open?id=0BwaskdUV3uhoSDFBRzZlaGYyMFU

Not sure if that works but I got a sound clip of a pull I did tonight. Can't get enough of it.


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Offline mrbreeze

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Re: These cb750s rip!!!
« Reply #5 on: August 04, 2016, 09:07:01 PM »
Quote from: Mantree on August 04, 2016, 05:06:21 PM
I once took my 74 up to 115 before I remembered that I had brakes built in the 70s and thought it best to back off the throttle 

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I had my 75 750K up to 120 in 3rd gear running a 42 tooth rear sprocket and.....oh wait!....this isn't the BS thread!!.......Nevermind ;D
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Offline RevDoc

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Re: These cb750s rip!!!
« Reply #6 on: August 04, 2016, 09:51:28 PM »
Quote from: colvinry on August 04, 2016, 08:02:02 PM
https://drive.google.com/open?id=0BwaskdUV3uhoSDFBRzZlaGYyMFU

Not sure if that works but I got a sound clip of a pull I did tonight. Can't get enough of it.


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Yup, as Wilbur said, there's no hope for you now. You're toast! ;D
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Dana

'78 CB550K--Angie
'82 CB750 Custom--Eva



As soon as you straddle a bike expect every other driver on the road to suddenly start competeing for the title "Dumbestsonofa#$%*inallNorthAmerica!!"

Offline ekpent

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Re: These cb750s rip!!!
« Reply #7 on: August 05, 2016, 08:55:03 AM »
Quote from: mrbreeze on August 04, 2016, 09:07:01 PM
Quote from: Mantree on August 04, 2016, 05:06:21 PM
I once took my 74 up to 115 before I remembered that I had brakes built in the 70s and thought it best to back off the throttle 

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I had my 75 750K up to 120 in 3rd gear running a 42 tooth rear sprocket and.....oh wait!....this isn't the BS thread!!.......Nevermind ;D
Thought JWilde was back !!
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Jwexperience

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Re: These cb750s rip!!!
« Reply #8 on: August 05, 2016, 09:49:03 AM »
He's gone?


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Offline flybox1

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Re: These cb750s rip!!!
« Reply #9 on: August 05, 2016, 10:24:05 AM »
Ejected, and now buggin the xs650 forum members  ;D
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
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"Knowledge without mileage equals bullsh!t" - Henry Rollins

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Offline BomberMann650

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Re: These cb750s rip!!!
« Reply #10 on: August 05, 2016, 11:47:51 AM »
Abandon Hope Ye Who Enter Here.
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Offline rickmoore24

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Re: These cb750s rip!!!
« Reply #11 on: August 05, 2016, 12:09:51 PM »
All of your monies is now spoken for. LOL, sorry. Rick.
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1972 CB750 K2 (Daily Runner)
1972 CB750 K2 (Sold)
1973 CB750 K3 (Hardtail 836cc)
1998 CBR F3 - R.I.P., went down on the 101 in Calabasas, Ca.
1995 EG6

Offline Mantree

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Re: These cb750s rip!!!
« Reply #12 on: August 06, 2016, 09:17:07 PM »
Quote from: mrbreeze on August 04, 2016, 09:07:01 PM
Quote from: Mantree on August 04, 2016, 05:06:21 PM
I once took my 74 up to 115 before I remembered that I had brakes built in the 70s and thought it best to back off the throttle 

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I had my 75 750K up to 120 in 3rd gear running a 42 tooth rear sprocket and.....oh wait!....this isn't the BS thread!!.......Nevermind ;D
Top speed on a stock 750 is 120 I don't know what the top speed on mine is as my uncle was never happy wih stock engines and he owend it from the day it came off the line untell the day he passed 2 years ago. 

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Offline mrbreeze

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Re: These cb750s rip!!!
« Reply #13 on: August 06, 2016, 10:19:00 PM »
I think it was actually 125 but anything can be made to go faster. I was just BS'n about doing it in 3rd. I have really had it to the ton a few times but I was in 5th. Had more room to go but I backed her down. I went 110 on my old Kawi 1000 LTD but the front end started shaking.
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Offline Stev-o

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Re: These cb750s rip!!!
« Reply #14 on: August 07, 2016, 10:26:09 AM »
Quote from: mrbreeze on August 06, 2016, 10:19:00 PM

I went 110 on my old Kawi 1000 LTD but the front end started shaking.

Hey Fred...I had a Kaw 1000 LTD years ago too, great bike.  I would max it out at 125 repeatedly trying to keep up with my brother on his Yamaha XS1100 - his did 130. 
I never had a shake....
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline mrbreeze

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Re: These cb750s rip!!!
« Reply #15 on: August 07, 2016, 12:55:20 PM »
Quote from: Stev-o on August 07, 2016, 10:26:09 AM
Quote from: mrbreeze on August 06, 2016, 10:19:00 PM

I went 110 on my old Kawi 1000 LTD but the front end started shaking.

Hey Fred...I had a Kaw 1000 LTD years ago too, great bike.  I would max it out at 125 repeatedly trying to keep up with my brother on his Yamaha XS1100 - his did 130. 
I never had a shake....
Well mine didn't have a new, balanced front tire but what I'm saying is I had it at that speed with room to go faster.
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MEMBER # 257
Fool me once..shame on you. Fool me twice..I'm kickin' your a$$......

Offline 754

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Re: These cb750s rip!!!
« Reply #16 on: August 07, 2016, 06:59:34 PM »
My 73 did 115 in fourth..
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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

Offline Mantree

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Re: These cb750s rip!!!
« Reply #17 on: August 08, 2016, 06:40:06 PM »
Now my xvz1300 it's a wall at about 97 but that's because of the extra wind resistance and 3rd wheel from the sidecar

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Offline kpier883

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Re: These cb750s rip!!!
« Reply #18 on: August 23, 2016, 06:28:38 PM »
Yep, my '82 LTD 1000 would go into a weave above 110 after it got some miles on it.  It could be ridden for miles that way as it never turned into anything violent. Top speed was in the 125 MPH range.  You had to calculate speed from the tachometer since it had the gov't mandated 85 MPH speedometer.  Fifth gear was 15 MPH per 1000 RPM and it could peg the 8500 RPM redline in 5th pretty quickly.  Below 100 it tracked like it was on rails and cornered better than anything vintage I have owned.  I think the 81 and up "J" motor (998cc) bikes benefited from frame improvements that Kawasaki was doing for Eddie Lawson and the Superbike team. 
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74 CB750
80 CBX
82 KZ1000 K2 (LTD)
57 1/2 ton chevy
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