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Author Topic: 1978 CB750K — Post 836 OIL PRESSURE - not good  (Read 247724 times)

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Offline SKTP

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Re: 1978 CB750K — It never ends! (NEW ELECTRICAL ISSUES! F**K!!!!)
« Reply #1325 on: September 03, 2019, 11:26:28 AM »
Turns out I am just dumb and my battery was dead. I swear it read fine and the electrical got knocked out by the bump...but the new battery is in and it runs perfectly so far.
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1978k rebuild thread http://forums.sohc4.net/index.php?topic=68423.0
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Offline SOHC4 Cafe Racer Fan

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Re: 1978 CB750K — It never ends! (I am not a smart person)
« Reply #1326 on: September 03, 2019, 01:52:42 PM »

Chris,

Make sure your charging system is working up to snuff and/or keep it on a battery tender.
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline PeWe

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Re: 1978 CB750K — It never ends! (I am not a smart person)
« Reply #1327 on: September 05, 2019, 08:24:43 AM »
About solenoids for those who need one. I found starter solenoid from China for around $5-6 US with shipping.  I had to recrimp the terminals to fit main harness. Work fine. I hope it will live longer than previous Yamiya aftermarket that costed much more and died within 3 months of use.

I ordered 3 cheap ones more just for sure. Need to crimp proper socket and pin.
« Last Edit: September 05, 2019, 08:27:11 AM by PeWe »
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline SKTP

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Re: 1978 CB750K — It never ends! (I am not a smart person)
« Reply #1328 on: September 06, 2019, 12:03:45 PM »
September 9th, seems like I will lose the entire beginning of this thread...I downloaded all the pictures from photo bucket, but there is no way I am paying for their terrible image hosting service...

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1978k rebuild thread http://forums.sohc4.net/index.php?topic=68423.0
BIKE OF THE MONTH - OCTOBER 2017
2003 Ducati M800ie
1997 Honda CR-V
2004 Honda CR-V
1966 Honda S90

Offline jgger

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Re: 1978 CB750K — It never ends! (I am not a smart person)
« Reply #1329 on: September 06, 2019, 12:20:07 PM »
Upgrade-download-CANCEL!
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Offline Tintop

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Re: 1978 CB750K — It never ends! (I am not a smart person)
« Reply #1330 on: September 06, 2019, 03:38:59 PM »
Time for a class action suit!  As far as I'm concerned my build threads are literary work, and Photobucket's threatened action will constitute destruction of private property.  The fact is they lowered the limited after purchase, and then turn around and try to hose us by saying we're over their new limit.  BS
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1977 CB550/4 Cafe - Speed Warrior / BOTM 03/11
1980 CB750F (project)
Whittaker GBF Vintage Racing Sidecar (XS750 power) - ITG / 151's / CMR Racing Products (SOLD)
1976 CB400 SS - stock / BOTM 04/11 (SOLD)
1973 CB750 K - basket case (SOLD)
77 CB550 Cafe build
550/750 Filter Thread
Sidecar Rebuild Thread

Offline SKTP

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Re: 1978 CB750K — It never ends! (I am not a smart person)
« Reply #1331 on: September 09, 2019, 12:27:05 PM »
Sorry about the poor GoPro Aiming...I will shoot a better video soon...but I though you all might like hearing the pipe...I punch it up to 80mph (4th) after the light

As you can see, the Black bomber Speedo "re-calibration" didn't really work out so well...Maybe I should ask for my money back?


Not a valid vimeo URL
« Last Edit: January 03, 2020, 05:05:40 PM by SKTP »
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BIKE OF THE MONTH - OCTOBER 2017
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2004 Honda CR-V
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Offline RAFster122s

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Re: 1978 CB750K — It never ends! (I am not a smart person)
« Reply #1332 on: September 09, 2019, 02:14:15 PM »
I think I would be asking them to do it again correctly or refund my money.  Are your cables in good shape rotating freely?

David
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Offline SKTP

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Re: 1978 CB750K — It never ends! (I am not a smart person)
« Reply #1333 on: September 09, 2019, 02:45:01 PM »
Quote from: RAF122S on September 09, 2019, 02:14:15 PM
I think I would be asking them to do it again correctly or refund my money.  Are your cables in good shape rotating freely?

David

Yes, I just called them and will be shipping it back to them to try again http://www.foreignspeedoinc.com
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1978k rebuild thread http://forums.sohc4.net/index.php?topic=68423.0
BIKE OF THE MONTH - OCTOBER 2017
2003 Ducati M800ie
1997 Honda CR-V
2004 Honda CR-V
1966 Honda S90

Offline SOHC4 Cafe Racer Fan

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Re: 1978 CB750K — It never ends! (I am not a smart person)
« Reply #1334 on: September 09, 2019, 07:39:13 PM »
Sounds like a fairly happy motor taking off south on PCH at Seal Beach going into Sunset.

Are you going to the Rally this coming weekend?
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline SKTP

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Re: 1978 CB750K — It never ends! (I am not a smart person)
« Reply #1335 on: September 10, 2019, 10:22:58 AM »
Only fairly happy?

I don't think I can do the ride...babies make riding motorcycles difficult
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1978k rebuild thread http://forums.sohc4.net/index.php?topic=68423.0
BIKE OF THE MONTH - OCTOBER 2017
2003 Ducati M800ie
1997 Honda CR-V
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1966 Honda S90

Offline SOHC4 Cafe Racer Fan

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Re: 1978 CB750K — It never ends! (I am not a smart person)
« Reply #1336 on: September 10, 2019, 01:58:27 PM »
Quote from: SKTP on September 10, 2019, 10:22:58 AM
Only fairly happy?

I don't think I can do the ride...babies make riding motorcycles difficult

I was being understated.  The bike sounds healthy.

Are you going to the Rally with Liam?
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline SKTP

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Re: 1978 CB750K — It never ends! (I am not a smart person)
« Reply #1337 on: September 11, 2019, 01:14:46 PM »
Unless I get a sitter, I can't do it...
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1978k rebuild thread http://forums.sohc4.net/index.php?topic=68423.0
BIKE OF THE MONTH - OCTOBER 2017
2003 Ducati M800ie
1997 Honda CR-V
2004 Honda CR-V
1966 Honda S90

Offline SKTP

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Re: 1978 CB750K — It never ends! (I am not a smart person)
« Reply #1338 on: January 03, 2020, 05:06:14 PM »
Last Ride of 2019...still need to ship my Speedo back for a re-re-calibration
Not a valid vimeo URL
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1978k rebuild thread http://forums.sohc4.net/index.php?topic=68423.0
BIKE OF THE MONTH - OCTOBER 2017
2003 Ducati M800ie
1997 Honda CR-V
2004 Honda CR-V
1966 Honda S90

Offline SOHC4 Cafe Racer Fan

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Re: 1978 CB750K — It never ends...
« Reply #1339 on: January 04, 2020, 11:47:23 AM »
Love that bike. It hauls and puts a smile on your face when you ride it!
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline SKTP

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Re: 1978 CB750K — It never ends...
« Reply #1340 on: January 22, 2020, 11:47:15 AM »
Not a valid vimeo URL
Did 165 miles on Sunday...

Latigo Canyon Road was the most challenging road I have ever been on...it was INSANE!!!!

https://goo.gl/maps/EmkGVEEvhJKYuA6n7

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1978k rebuild thread http://forums.sohc4.net/index.php?topic=68423.0
BIKE OF THE MONTH - OCTOBER 2017
2003 Ducati M800ie
1997 Honda CR-V
2004 Honda CR-V
1966 Honda S90

Offline andy750

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Re: 1978 CB750K — It never ends...
« Reply #1341 on: January 23, 2020, 03:12:32 AM »
Wow! That looked like an excellent ride - really like the video got a very impression of the terrain. More photos would have been good maybe a short section of video on the really twisty mountain section ;) What software/app are you using to do this? Would like to adopt it for my New England rides.

If I come to LA and rent a bike will you show me some routes like this or maybe share a GPX file? I just checked the Google maps link - amazing! How is the traffic? Jet Blue flies to LA direct from Boston ;)

More please!
Andy
« Last Edit: January 23, 2020, 03:14:50 AM by andy750 »
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Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline SOHC4 Cafe Racer Fan

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Re: 1978 CB750K — It never ends...
« Reply #1342 on: January 23, 2020, 08:35:24 AM »
Latigo, Stunt, The Snake -- all great roads up there.  But Angeles Crest, ahh. That's an incredible ride.
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline SKTP

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Re: 1978 CB750K — It never ends...
« Reply #1343 on: July 27, 2020, 03:32:30 PM »
Not a valid vimeo URL
So I finally have returned my CB450 Black Bomber tach/Speedo top the guys at http://www.foreignspeedoinc.com.

They did the recalibration originally and it never worked properly.

In the meantime I bought this little tach https://www.dimecitycycles.com/vintage-cafe-racer-caferacer-bobber-brat-chopper-custom-motorcycle-parts-mini-chrome-tach-tachometer-15-0033b.html
It seems to work well. It is smooth. I have to hope that it is accurate. I now know where 8000rpms actually is? Video above just to show my temporary tach/idiot-lights setup.

So here's the question, if you made I this far. At 8000rpm in 5th, iPhone GPS says I am going 102mph.

I always hear that a 1978 CB750K can go 120ish mph...have you gone that fast? If so, what RPM was it?
« Last Edit: July 27, 2020, 03:41:10 PM by SKTP »
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BIKE OF THE MONTH - OCTOBER 2017
2003 Ducati M800ie
1997 Honda CR-V
2004 Honda CR-V
1966 Honda S90

Online seanbarney41

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Re: 1978 CB750K — It never ends...
« Reply #1344 on: July 27, 2020, 03:43:48 PM »
It is simple math to calculate actual speed using rpm, final drive ratio, sprocket size, tire size...well not that simple i guess.  Just google up the equation.
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If it works good, it looks good...

Offline SKTP

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Re: 1978 CB750K — It never ends...
« Reply #1345 on: September 27, 2020, 09:41:09 PM »
So I sent the Bomber Speedo/tach back and they calibrated it for the wrong bike. Then I sent it back again and am currently waiting...3 times the charm?

Here's the temp tach (and working idiots lights) that I have been running in the meantime...It is this one (see link) and I am actually very pleased with it https://www.dimecitycycles.com/vintage-cafe-racer-caferacer-bobber-brat-chopper-custom-motorcycle-parts-mini-chrome-tach-tachometer-15-0033b.html



« Last Edit: September 27, 2020, 10:36:32 PM by SKTP »
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BIKE OF THE MONTH - OCTOBER 2017
2003 Ducati M800ie
1997 Honda CR-V
2004 Honda CR-V
1966 Honda S90

Offline RAFster122s

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Re: 1978 CB750K — It never ends...
« Reply #1346 on: September 28, 2020, 01:46:06 AM »
Cool!
Had Foreign speedo work on a Volvo 240 cluster years ago (Greater than decade ago now,) ...they did very good work.  Sorry to hear they have messed up a couple times...
David
« Last Edit: September 28, 2020, 01:48:20 AM by RAF122S »
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Offline RAFster122s

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Re: 1978 CB750K — It never ends...
« Reply #1347 on: September 28, 2020, 01:50:08 AM »
Did you calculate a correction factor for drag in the chain drive? Better to be slightly high than low when dealing with the police...
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Offline SKTP

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Re: 1978 CB750K — It never ends...
« Reply #1348 on: October 02, 2020, 01:04:51 PM »
I just followed the instructions given to me by Foreign Speedo...Counted the turns cable turns, rolling the bike for a given distance...repeated 3 times (actually did 5) and sent them the information

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BIKE OF THE MONTH - OCTOBER 2017
2003 Ducati M800ie
1997 Honda CR-V
2004 Honda CR-V
1966 Honda S90

Offline SKTP

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Re: 1978 CB750K — It never ends...
« Reply #1349 on: November 02, 2020, 09:47:41 AM »
Well, I am still waiting for the rebuilt speedo/tach and I am using the mini tach pictured above, it has been working well but on yesterday's ride it started going crazy...thrashing all over the place and swinging violently side to side...I am thinking that new cables may be in order? The ones I have appear to be fine and I greased them with All purpose Chassis grease...and the tach was fine....maybe I need shorter cables since I am not running the stock clock placement? Super annoying
« Last Edit: November 02, 2020, 09:49:55 AM by SKTP »
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1978k rebuild thread http://forums.sohc4.net/index.php?topic=68423.0
BIKE OF THE MONTH - OCTOBER 2017
2003 Ducati M800ie
1997 Honda CR-V
2004 Honda CR-V
1966 Honda S90
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