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Author Topic: 1978 CB750K — Post 836 OIL PRESSURE - not good  (Read 247884 times)

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Offline Rnobx67

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Re: 1978 CB750K — It never ends! (530 chain conversion)
« Reply #1300 on: August 06, 2018, 03:27:23 PM »
Quote from: SKTP on July 18, 2018, 03:50:46 PM

https://4into1.com/electronic-ignition-kit-dynatek-honda-cb750-1969-1978/

I bought this. Doubt I can install it until 2 weekends from now....hoping it fixes my Lag issue when I really lay on the gas...

Maybe I will need also this electronic ignition too, if it seems so good :)
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Offline madmtnmotors

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Re: 1978 CB750K — It never ends! (530 chain conversion)
« Reply #1301 on: August 06, 2018, 04:14:20 PM »
Quote from: Rnobx67 on August 06, 2018, 03:27:23 PM
Quote from: SKTP on July 18, 2018, 03:50:46 PM

https://4into1.com/electronic-ignition-kit-dynatek-honda-cb750-1969-1978/

I bought this. Doubt I can install it until 2 weekends from now....hoping it fixes my Lag issue when I really lay on the gas...

Maybe I will need also this electronic ignition too, if it seems so good :)

Not necessarily. Any profound improvement would be a likely indicator that something was wrong with the previous ignition system. I have switched between stock points/coils to Dyna S with stock coils, to Dyna S with 3 ohm coils to even a Dyna III, also with both 5 ohm and 3 ohm coils with no appreciable difference on the "butt dyno". They all work well when working properly.  8)
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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

Sent from my Tandy TRS-80!

Offline SKTP

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Re: 1978 CB750K — It never ends! (New Coils and Dyna S - Game Changer!)
« Reply #1302 on: August 07, 2018, 10:52:16 AM »
Yes I am thinking that I had an issue with my points or coils or both? Either way...it's so much better now. I actually accelerate now! 85 in fourth easily. Very happy
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1978k rebuild thread http://forums.sohc4.net/index.php?topic=68423.0
BIKE OF THE MONTH - OCTOBER 2017
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Offline SOHC4 Cafe Racer Fan

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Re: 1978 CB750K — It never ends! (New Coils and Dyna S - Game Changer!)
« Reply #1303 on: August 07, 2018, 11:01:51 AM »
Quote from: SKTP on August 07, 2018, 10:52:16 AM
Yes I am thinking that I had an issue with my points or coils or both? Either way...it's so much better now. I actually accelerate now! 85 in fourth easily. Very happy

Just wait until you can do 85 in second gear (on a 350) a la JWilde!  ;D

Joking aside, each time I've installed electronic ignition, the bike starts easier and appears to run smoother.
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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 madmtnmotors

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Re: 1978 CB750K — It never ends! (New Coils and Dyna S - Game Changer!)
« Reply #1304 on: August 07, 2018, 11:54:07 AM »
Quote from: SKTP on August 07, 2018, 10:52:16 AM
Yes I am thinking that I had an issue with my points or coils or both? Either way...it's so much better now. I actually accelerate now! 85 in fourth easily. Very happy

That is part of their charm. Taking a marginally performing bike and making it run well I happen to find very rewarding.  8)

I, too, prefer the electronic ignition instead of points. Fewer moving parts!  ;)  ;D
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TAMTF...


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

Sent from my Tandy TRS-80!

Offline SKTP

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Re: 1978 CB750K — It never ends! (New Coils and Dyna S - Game Changer!)
« Reply #1305 on: August 07, 2018, 04:35:59 PM »
I scraped the pipe turning/leaning right pretty good...I think I'll be figuring out how to tuck that up next
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1978k rebuild thread http://forums.sohc4.net/index.php?topic=68423.0
BIKE OF THE MONTH - OCTOBER 2017
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1997 Honda CR-V
2004 Honda CR-V
1966 Honda S90

Offline SKTP

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Re: 1978 CB750K — It never ends! (New Coils and Dyna S - Game Changer!)
« Reply #1306 on: August 27, 2018, 12:45:29 PM »
So...I put Godffrey's thinned rotors on and WOW...they are much lighter than what I had on there...and so far, no squeaking

https://godfferysgarage.com

I think I figured out the mystery of the warped rotor...there was excess powder coat on the hub!!!! Probably my old rotors are fine...but these are lighter, so I am happy...I also got the bike to 100.6 MPH on the GPS Speedo...it still had more to go...but Traffic tickets said slow down (it was on the 605 for CA peeps)!!!



NOTE: that drip on the ground is not from my bike
« Last Edit: August 27, 2018, 12:54:35 PM 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

Offline SOHC4 Cafe Racer Fan

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Re: 1978 CB750K — It never ends! (New ROTORS)
« Reply #1307 on: August 27, 2018, 04:31:23 PM »
Awesome Chris!
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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! (New ROTORS)
« Reply #1308 on: June 20, 2019, 05:31:26 PM »
I am back! My electric starter seems to have stopped working. I believe it is my Stator. Should I source and OEM one or are there good aftermarket ones? Any help appreciated as always...
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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! (New ROTORS)
« Reply #1309 on: June 20, 2019, 10:14:59 PM »
Quote from: SKTP on June 20, 2019, 05:31:26 PM
I am back! My electric starter seems to have stopped working. I believe it is my Stator. Should I source and OEM one or are there good aftermarket ones? Any help appreciated as always...

You can rebuild yours OR you might consider upgrading with a 1980-83 DOHC CB900/1100F starter.
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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! (Stator)
« Reply #1310 on: June 21, 2019, 05:40:45 AM »
I’m way too tired. I meant solenoid...

My starter stopped working. I think it’s my SOLENOID.

Source an OEM ONE? Rebuild? Good aftermarket?

It was working. Now it just makes my dash lights turn off. Then if I wait a few seconds I can turn the key on and off and they come on again. It makes no sound. I can kick or push start it easily. It was working fine, but did very occasionally do this same thing, but then work again after it got running.
« Last Edit: June 21, 2019, 05:58:49 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
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1966 Honda S90

Offline Tintop

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Re: 1978 CB750K — It never ends! (Solenoid, I meant to say)
« Reply #1311 on: June 21, 2019, 04:31:20 PM »
I'd spring for the OEM, but there are lots of inexpensive ones on eBay.
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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! (Solenoid, I meant to say)
« Reply #1312 on: June 22, 2019, 05:55:35 PM »
OEM IS $139?!!!! Might try a rebuild first
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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 RAFster122s

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Re: 1978 CB750K — It never ends! (Solenoid, I meant to say)
« Reply #1313 on: June 22, 2019, 06:13:27 PM »
Future reference,South Sound Honda in Olympia WA has some of if not the lowest prices on Honda parts I have found...very reasonable shipping charges as well. David
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David- back in the desert SW!

Offline Tintop

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Re: 1978 CB750K — It never ends! (Solenoid, I meant to say)
« Reply #1314 on: June 22, 2019, 08:31:15 PM »
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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 seanbarney41

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Re: 1978 CB750K — It never ends! (Solenoid, I meant to say)
« Reply #1315 on: June 22, 2019, 11:51:13 PM »
Dude, pretty sure I got good used for $30 shipped...
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If it works good, it looks good...

Offline SKTP

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Re: 1978 CB750K — It never ends! (Solenoid, I meant to say)
« Reply #1316 on: June 27, 2019, 08:23:51 AM »
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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! (Solenoid, I meant to say)
« Reply #1317 on: July 23, 2019, 01:25:13 PM »
Well the fun never ends. I finally had some time and went to install the new solenoid, which I thought was the issue.

SO I swapped it in and I had zero power. No dash-lights, nothing. So I put the old one back in, then...Checked the battery, it was good. Checked the power at the key switch = Good. Realized that the parking light WAS working. Cleaned all the connections in the bucket. Then I talked to an experienced mechcanic on the phone and I now believe that it is the START BUTTON....if I press the start button I can see the neutral light very faintly and sporadically flicker....So I am going to try clean and rebuild the start switch...do this characteristics make you think that it could be the switch? I just want to ride!!!!
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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! (NEW ELECTRICAL ISSUES! F**K!!!!)
« Reply #1318 on: July 27, 2019, 08:13:57 PM »
Cleaned the switch. It was filthy. It was not the issue.
« Last Edit: July 29, 2019, 11:57:37 AM 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! (NEW ELECTRICAL ISSUES! F**K!!!!)
« Reply #1319 on: July 27, 2019, 10:24:50 PM »
It being filthy would have reared its head at some point...so, it is good it is cleaned and lubed now.

Check the basics again and start testing for proper voltage at various point in your wiring where you know there should be voltage.  You are likely dealing with a short circuit somewhere in your wiring to give you the symptoms you describe.
David
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Offline SKTP

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Re: 1978 CB750K — It never ends! (NEW ELECTRICAL ISSUES! F**K!!!!)
« Reply #1320 on: August 21, 2019, 04:00:03 PM »
Is this the battery I want? Have you ordered one from here? Thanks (I want to spend less than $100)

https://www.batterystuff.com/powersports-batteries/sYTX14AHL-BS.html#WayPointInformation

OTHER OPTIONS:

https://www.batterystuff.com/batteries/motorcycle/honda/1978/750cc-cb750k-four/
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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 RAFster122s

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Re: 1978 CB750K — It never ends! (NEW ELECTRICAL ISSUES! F**K!!!!)
« Reply #1321 on: August 21, 2019, 04:10:26 PM »
Neutral right being dim could be a sign your neutral switch is dirty and not making good contact.

Scorpion AGM batteries are good quality. Be sure your battery maintainer is AGM compatible, older models do not treat them properly.

David
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Offline SOHC4 Cafe Racer Fan

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Re: 1978 CB750K — It never ends! (NEW ELECTRICAL ISSUES! F**K!!!!)
« Reply #1322 on: August 21, 2019, 05:14:40 PM »
I've never used a Scorpion.  YUSA makes reliable AGM batteries.  If you decide to go lithium based, I would recommend Shorai.  IF you do go with a lithium-based battery, you will need a specific reg/rec that regulates charge voltage down to 14.0v (see Rick's).  Lithium batteries do not do well with voltage spikes above 14.2 V.
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Offline CB_Jeff

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Re: 1978 CB750K — It never ends! (NEW ELECTRICAL ISSUES! F**K!!!!)
« Reply #1323 on: August 21, 2019, 06:09:50 PM »
I can offer that I have had good luck with the scorpion batteries. My oldest one is four years old at this point and still seems fine. For the price seems like good value.
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Offline SKTP

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Re: 1978 CB750K — It never ends! (NEW ELECTRICAL ISSUES! F**K!!!!)
« Reply #1324 on: August 21, 2019, 06:57:10 PM »
Just ordered the scorpion...thanks for the input
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1978k rebuild thread http://forums.sohc4.net/index.php?topic=68423.0
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1997 Honda CR-V
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