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Author Topic: 1978 CB750K — Post 836 OIL PRESSURE - Seems bad :(  (Read 336821 times)

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Offline nutsandbolts2013

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #600 on: June 29, 2013, 09:25:36 PM »
Here's a pic of what I had to do to finally get it right. The right side bracket mount holes on the forks are offset slightly. With the fender bracket in place, the caliper mounts still might not be centered properly. I had to use nuts as spacers after some serious trial & error. It's a little hard to explain but what really helped me was Randy's Cycle blog about the same issue. Here's a link: Hope it helps. See entry #19

http://www.rcycle.com/1974HondaCB750RandyCreel.html
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Offline SKTP

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #601 on: July 01, 2013, 12:01:51 PM »
Thanks for all the brake help....I think I have it sorted....

This just arrived on my desk!



I'll find out tonight...but I hope that it works with my fork boots...don't really see why it wouldn't...excited!

I think stainless SpeedBleeders should arrive this afternoon...Happy Canada Day indeed!
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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 nutsandbolts2013

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #602 on: July 01, 2013, 04:02:10 PM »
I have the same Tarozzi stabilizer on my CB. It probably was one of the best investments I made and now i'm digging into turns with confidence.
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Offline SKTP

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #603 on: July 01, 2013, 09:12:13 PM »
Just put it on. It looks awesome...

Also Speed Bleeders are amazing!
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BIKE OF THE MONTH - OCTOBER 2017
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Offline flybox1

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #604 on: July 02, 2013, 08:59:36 AM »
Quote from: SKTP on July 01, 2013, 09:12:13 PM
Just put it on. It looks awesome...

Also Speed Bleeders are amazing! yuuup!   ;D

+1  i rode w/o my front fender for a week before my Tarozzi was installed.
awesome improvement in front end feel and stability.
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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)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline brandEn

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #605 on: July 02, 2013, 09:26:59 AM »
Nice, I just got mine last week and sent it to the powdercoater. That is a weird coating whatever it is.
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Offline SKTP

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #606 on: July 02, 2013, 10:40:30 AM »
Quote from: brandEn on July 02, 2013, 09:26:59 AM
Nice, I just got mine last week and sent it to the powdercoater. That is a weird coating whatever it is.

Agreed...not the nicest finish ever...
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BIKE OF THE MONTH - OCTOBER 2017
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Offline SKTP

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #607 on: July 02, 2013, 11:15:43 AM »
Good bye caliper paint...but I think I finally got them not leaking...the stock side is still dragging and I will adjust it/figure it out soon...


Planning on removing the stock fender mount and using the new brace as an anchor point for the fiberglass fender


This is how much its leaking. I think out of the head gasket...I need to tighten it down more...but to do so I need to take off the tank and my fingers still have not recovered from putting the fuel line ON the petcock...
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BIKE OF THE MONTH - OCTOBER 2017
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Offline nutsandbolts2013

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #608 on: July 02, 2013, 04:50:08 PM »
I know, These brake calipers can be tricky. I made the mistake of first using a 1976 CB rear caliper with dual piston. It froze so tight I was stuck on the side of the road. Good thing I was close to a parking lot. These CB brake systems can be tricky ...even after rebuilding.
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Offline SKTP

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #609 on: July 04, 2013, 02:03:48 PM »
More break in/test driving...

It's is sloppy getting into 5th. Perfect in all other gears. But it takes a hard up click and sometimes two before it wants to stay in 5th.

Beginning to think my breaks are leaking inside at the piston seal. I reused both seals. Guess I'll order two and get them in there.

My black-bomber speedo and tach appear to be basically useless
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BIKE OF THE MONTH - OCTOBER 2017
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Offline SKTP

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #610 on: July 04, 2013, 02:51:28 PM »
Yikes! $17.02 for a brake piston seal at BikeBandit?!!

Anybody have a less expensive source or is that the going rate?

(will get googling)

http://www.bikebandit.com/houseofmotorcycles/1978-honda-cb750k/o/m9458#sch401943
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Offline Syscrush

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #611 on: July 04, 2013, 09:56:32 PM »
Quote from: SKTP on July 04, 2013, 02:51:28 PM
Yikes! $17.02 for a brake piston seal at BikeBandit?!!

Anybody have a less expensive source or is that the going rate?

(will get googling)

http://www.bikebandit.com/houseofmotorcycles/1978-honda-cb750k/o/m9458#sch401943
You only save money if the cheaper part actually works.  If you find one for $5 and it doesn't seal right, then you're out $22.02 instead of $17.02.

If you can get the OEM brake seal parts from BikeBandit, DO IT!  They won't be around forever.  An OEM Honda m/c reservoir assembly for my bike was about $100, my mechanic found an aftermarket setup for $50.  You can guess the rest.
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Life is precious: wear your f'n helmet!
There's nothing more expensive than a free bike...
FWIW, I'm not a shill for Race Tech - I've just got a thing for good suspension and the RTCE's are the most cost-effective mod for these old damping rod front ends.

Offline SKTP

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #612 on: July 05, 2013, 07:55:56 PM »
Score! I already bought two seals and forgot I had them!

Any caliper rebuild tips? Do I need to soak the seals or something? I'll get searching...

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Offline cheftuskey121

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #613 on: July 05, 2013, 08:00:03 PM »
ideally you should use brake assembly lube on the seal and in where the seal goes. I have Mckay brand and its probably 40 years old. you can find some online I think. its supposed to create a barrier only on the seal so nothing water based can get sucked in by the dot 3 or dot 4 fluid.
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Offline SKTP

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #614 on: July 06, 2013, 10:23:07 AM »
Appears to be some heated debate about this stuff....

From what I have read this seems to be the stuff:

http://www.airosol.com/50600.html

Looks like I'll have leaky calipers untilim able to order it
« Last Edit: July 06, 2013, 10:19:16 PM by SKTP »
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BIKE OF THE MONTH - OCTOBER 2017
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Offline SKTP

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #615 on: July 06, 2013, 06:08:25 PM »
Front fender drilled and mounted. Still need to paint.



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Offline flybox1

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #616 on: July 06, 2013, 08:47:31 PM »
Just enough brake assembly lube to get the rings slid into place. And a light finger coating on the side contacting the piston.  Then slide in your piston.
Dow high vacuum grease on the inside edge and sides of your brake pad only.  It's to keep out moisture.
Bleed
Ride
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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)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline SKTP

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #617 on: July 07, 2013, 08:23:12 PM »
So after all that I'm not sure if I like the looks of the black fender at all...



Re-torqued the head cover....seems to be leaking less...but still leaking
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Offline seanbarney41

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #618 on: July 07, 2013, 08:39:14 PM »
Quote from: SKTP on July 07, 2013, 08:23:12 PM
So after all that I'm not sure if I like the looks of the black fender at all...



Re-torqued the head cover....seems to be leaking less...but still leaking
looks damn good to me...or are one of those types who never plan to get caught in the rain
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If it works good, it looks good...

Offline SKTP

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #619 on: July 07, 2013, 08:47:12 PM »
I want a front fender...regretting my choice to dismantle and give away the stock chrome one

Maybe black will grow in me. I'm tired of spending money
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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 nutsandbolts2013

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #620 on: July 08, 2013, 04:39:11 AM »
Not at all trying to influence, but I never had a front fender on mine and I don't miss it one bit. I thought I would be catching rocks and pebbles but it turned out not to be the case. My rear fender isn't there either, but I did use the hard plastic inner cover to protect my electrical since it was already molded and made for the frame.("78 CB750f") Worked perfect without sacrificing the look I was trying to achieve.

Great build, Now you need road time.. 8)
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Offline SKTP

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #621 on: July 08, 2013, 12:57:48 PM »
None of these products are correct are they...I have only found that McKay stuff sold by the case

http://www.carquest.com/webapp/wcs/stores/servlet/subcategory__10151_-1_10651_11337

How about this?:

http://www.summitracing.com/parts/wil-290-11087

I think I am going to go for it...
« Last Edit: July 08, 2013, 01:01:19 PM by SKTP »
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BIKE OF THE MONTH - OCTOBER 2017
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Offline SKTP

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #622 on: July 08, 2013, 01:06:24 PM »
Quote from: nutsandbolts2013 on July 08, 2013, 04:39:11 AM
Not at all trying to influence, but I never had a front fender on mine and I don't miss it one bit. I thought I would be catching rocks and pebbles but it turned out not to be the case. My rear fender isn't there either, but I did use the hard plastic inner cover to protect my electrical since it was already molded and made for the frame.("78 CB750f") Worked perfect without sacrificing the look I was trying to achieve.

Great build, Now you need road time.. 8)

I like your oil tank "insert" mesh...very cool
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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 nutsandbolts2013

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #623 on: July 08, 2013, 03:24:38 PM »
Thanks a bunch. It was a fun winter project. Started with just a frame and built my way out. I was building my CB as you were building yours. Overall, I was most surprised by the handling on these bikes. This is my first vintage bike( I'm used to riding the crotch rockets but those days are over) and it's a keeper. This is a warm summer day bike. Just give me some open road and a destination and I'm good 2 go.....then again, who needs a destination.

I just got rid of one extra cable for a cleaner look. I picked up a Koso digital speedo. It's way more accurate than the aftermarket gauge.
« Last Edit: July 08, 2013, 03:30:46 PM by nutsandbolts2013 »
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Offline brandEn

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Re: 1978 CB750K - it runs! Now to make it stop!
« Reply #624 on: July 08, 2013, 04:57:03 PM »
Quote from: SKTP on July 07, 2013, 08:47:12 PM
I want a front fender...regretting my choice to dismantle and give away the stock chrome one

Maybe black will grow in me. I'm tired of spending money


I feel for ya, I know this feeling well!
 ;)


I am debating on going fenderless as well.
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