Author Topic: 1978 CB750K — Post 836 OIL PRESSURE - Hopefully Good!? (Read 251240 times)

SOHC4 Cafe Racer Fan · « **Reply #975 on:** June 13, 2016, 02:32:00 PM »

Nice beauty shots, Chris!

BLAC · « **Reply #976 on:** June 13, 2016, 02:37:01 PM »

Very cool! Is there ever any LA area meet/greet's?

SOHC4 Cafe Racer Fan · « **Reply #977 on:** June 13, 2016, 02:57:22 PM »

Quote from: blacSOHC on June 13, 2016, 02:37:01 PM

Very cool! Is there ever any LA area meet/greet's?

Aside from crowds congregating at Neptunes Net (Malibu), the Rock Store (Malibu Canyons), Newcombs Ranch (Angeles Crest Hwy), Deus Ex Machina (Venice), there are also vintage events -- VVMC every third Sunday and Vintae Bike Orange County every second Sunday. LA Motorcyclist http://www.lamotorcyclist.com also posts events.

RAFster122s · « **Reply #978 on:** June 14, 2016, 03:32:01 PM »

Chris the lack of meeting opportunities in LA must be devastating...

Bike looks great and it is too bad there isn't a great exhaust header like that available for the 550. But, I guess it is not as free flowing with the sharp bend... a little back pressure is a good thing.

Saw a demo on YouTube where they beat the crap out of a set of perf headers to see if it negatively affected dyno perf to clearance bend for fitment. Answer was NO. It really was surprising to see but the numbers didn't lie. It was EngineMasters if I recall correctly.

SOHC4 Cafe Racer Fan · « **Reply #979 on:** June 20, 2016, 08:32:47 AM »

Just a reminder that VOTING for July BOTM has re-started anew (ZERO'D OUT) since late Sunday night. If you voted before then, PLEASE cast your vote again.

http://forums.sohc4.net/index.php/topic,158564.0.html

SOHC4 Cafe Racer Fan · « **Reply #980 on:** June 27, 2016, 11:12:20 AM »

Just a friendly reminder. This bike and others are up for July Bike of the Month. Don't forget to vote before the end of June!

http://forums.sohc4.net/index.php/topic,158564.0.html

At Born Free 8 this weekend

(lifted off your Facebook page)

SKTP · « **Reply #981 on:** June 28, 2016, 09:56:20 AM »

Well until I figure out how to get that Black-Bomber gauges working I'm going to be running this temporarily. The bike feels too slow, but I suspect I am not revving it high enough, especially after years on a V-twin Monster. Wired this on last night. Can't wait to try it out. I run a Ram mount for the speedo with GPS.

I think the guts of the Black bomber speedo are too messed up and it's not calibrated correctly at all. I think the longer term plan will be to retrofit the headlight bucket with some smaller new gauges or maybe that Motorgadget Mini....but I really like the look of analog gauges

http://www.dimecitycycles.com/vintage-cafe-racer-caferacer-bobber-brat-chopper-custom-motorcycle-electronic-parts-mini-chrome-speedo-kilometer-speedometer-15-0040w.html

RAFster122s · « **Reply #982 on:** June 30, 2016, 02:09:06 AM »

you could send the Black Bomber gauge to a speedo repair place like Palo Alto Speedometer repair facility and they could rebuild it and probably even regear it to work with your bike, giving them the ratio it needed and a count of the factory gears from the front axle. Or send them the speedo gear assembly from the front axle along so they could count it themselves since it is a helical gear.

A wireless or wired bike speedo (used or new) can give you an accurate speedo to use in the meantime...
I picked up a nice wireless unit that was used and in excellent shape from a cyclist who upgraded his. It is a Sigma.

David

SKTP · « **Reply #983 on:** June 30, 2016, 10:29:01 AM »

Thank you RAF122S. I will contact them

SOHC4 Cafe Racer Fan · « **Reply #984 on:** June 30, 2016, 10:38:14 AM »

Quote from: SKTP on June 30, 2016, 10:29:01 AM

Thank you RAF122S. I will contact them

You might also contact Buz at Seattle Speedometer. My friends in the Pac Northwest rave about his work, and it's been featured in a few magazines, too.

http://seattlespeedometer.com/

SKTP · « **Reply #985 on:** June 30, 2016, 10:54:47 AM »

Thanks! Emails sent to both

From Palo Alto Speedometer, Inc. : "I am sorry but we do not offer service of these units. We do not have any parts at all for these. I am not sure who to refer you to. Sorry that we are not able to help."

These guys say they can do it!

http://www.foreignspeedoinc.com/contact and they are in San Diego

SOHC4 Cafe Racer Fan · « **Reply #986 on:** June 30, 2016, 11:47:35 AM »

Quote from: SKTP on June 30, 2016, 10:54:47 AM

Thanks! Emails sent to both

From Palo Alto Speedometer, Inc. : "I am sorry but we do not offer service of these units. We do not have any parts at all for these. I am not sure who to refer you to. Sorry that we are not able to help."

These guys say they can do it!

http://www.foreignspeedoinc.com/contact and they are in San Diego

Great to have a more local vendor. I haven't heard of them. I just tried to call my friend Dave Hargreaves at Cerberus Motorcycles in SD to get his $0.02, but he was unavailable.

SOHC4 Cafe Racer Fan · « **Reply #987 on:** June 30, 2016, 12:07:24 PM »

Dave just called me back. He said Foreign Speedo has been in SD Forever and does good work. Dave has also done exactly what you are trying to do -- he fitted the same style dual sweeper gauge into a CB750K7. Call him if you want to pick his brain. (619) 980-9377

SKTP · « **Reply #988 on:** June 30, 2016, 12:08:51 PM »

Thank you very much kind sir!

RAFster122s · « **Reply #989 on:** June 30, 2016, 01:40:05 PM »

I've had good results from Palo Alto speedo on cars but it was years ago...I presumed incorrectly they could do it. Sorry about that...
Would be good to send the Foreign Speedo info to Glenn and ask him to add it to the FAQ. I'm glad you found a place that could handle it.
Odds are they could even refurbish the face if it needs it.

David

SKTP · « **Reply #990 on:** July 05, 2016, 10:03:52 AM »

I am leaking out of my oil line connection (9 or 10) I'm not totally sure yet...I originally thought it was the oil tank over flow...but after routing a hose from it...I' am fairly sure it's the oil lines where they connect to the tank...are there crush washers in the connection that are not in the diagram (where the line meets the tank).

It gets hot there...could I use teflon? I will try tightening them more...any insight into this leak?

thanks

EDIT: Sorry I see the washers now....I will replace those

Ericcb750 · « **Reply #991 on:** July 06, 2016, 07:55:13 AM »

Love this bike man, That pipe.... I've never seen another like it... what kind is that? I have a stock 78K that I'm going to really get into this winter...been gathering parts for quite a while now and it's going to emerge a whole other animal in the Spring....(hopefully). ha-ha.

I've watched your thread since you first bough the bike and loved that gold leaf trim but The super sport tank looks awesome too. Do you know if we're able to use a Super sport tank on our 78K frame with the stock seat? I think it is longer so I wasn't sure.

Anyway, I'm also super jealous that you got to go to Born Free man, Im all the way over in CT and wish we had something comparable on the east coast. Awesome bike buddy, keep up the good work!!!

Syscrush · « **Reply #992 on:** July 06, 2016, 08:08:14 AM »

Every now and then I check in here to catch up on some of my favorite builds, it's good for my heart to see this one running and out in the world again!

It's funny, when I saw those header clamps on your bike, my first thought was "754 would dig those", then a few posts later I see that he made 'em.

Just one of many nice little touches on this machine. Good work!

SOHC4 Cafe Racer Fan · « **Reply #993 on:** July 06, 2016, 08:25:02 AM »

Quote from: Syscrush on July 06, 2016, 08:08:14 AM

It's funny, when I saw those header clamps on your bike, my first thought was "754 would dig those", then a few posts later I see that he made 'em.

I forgot about those. Frank is a man of several talents.

SKTP · « **Reply #994 on:** July 06, 2016, 10:23:41 AM »

Thanks everyone...I am loving the bike...Still sorting our the tach/speedo and some leaks

Are the oil washers a "crush" type? I need OEM? I don't have a tach seal at all...and I am now hoping my head leak is really a tach-seal leak (that would be the best news! I should do a powder test)

EricCB750 sent me a PM question but I figured I'd just answer it here to keep the thread alive and the knowledge public...

Quote from: Ericcb750 on July 06, 2016, 08:33:22 AM

Hey Buddy, My name is Eric and I too am a SOHC nut, I own a 78K and a 78F. I've followed your build since you started and always loved that darn exhaust!! I have a couple questions if you don't mind. I was wondering if when you mounted the super sport tank, did you have to modify your seat in any way for the SS tank to fit? I think they are a bit longer so I wasn't sure. I have a nice one and the 78F is nowhere near ready so I was thinking of tossing it on my 78K....

I also saw that you had your 78K honed? NOt sure if you went with an oversize at all but mine are definitely still within Spec. I wanted to see where you got your rings? Did you use OEM honda (Kind of hard to find) or some aftermarket ones? I've seen them on CB750 Supply and a couple other places but it's hard to tell what brand they are....I've heard the RIK ones are really good and obviously OEM ones too.

I was luck enough to score a brand spaking new set of 392 pistons in the 0.25 Oversize....only problem... no rings... So when I freshen mine up I'm going to need a set. Thanks for the help, I really appreciate it.

I did have to cut the stock seat pan. I actually did not do it perfectly and wish it was about 0.25" or so longer/closer to the seat...it could have snugged up better...nobody notices but it drives me crazy. I have no idea how an F seat mounts to a K...but for sure you need a shorter K seat pan with an F tank on a K frame.

I have no idea of what rings I used...I was a long time ago...I will try to dig it up...I must have documented it somewhere? My pistons are the stick one that came with the bike.

the pipe is called a triple-A. Info on them can be found here http://forums.sohc4.net/index.php?topic=85867.25

I still can't believe how high this bike revs...game changer with the bar mounted tach. Saving my penning to get the Bomber gauges rebuilt/calibrated...hopefully soon

754 · « **Reply #995 on:** July 06, 2016, 12:27:49 PM »

I think the oil line gaskets are aluminum, meaning they probably should not be reused.
I made a few for myself from hard aluminum, then tried annealing. But overheated a few.
Important thing is to run you finger over edge of fitting, make sure there's no burrs, and washer is clean.
I think the side of the washer against the hose is flat so you might be able to turn washer over after cleaning up surface with sandpaper.

SKTP · « **Reply #996 on:** July 06, 2016, 01:11:38 PM »

Thank you 754!

I will order the proper ones...that leak is annoying...it goes on the swing-arm then over to the left side chain tensioner and some gets on the tire which can't be good for grip...

Now for the tach seal....I don't have one yet (ordered)...but is it obvious which side faces up?

SOHC4 Cafe Racer Fan · « **Reply #997 on:** July 06, 2016, 01:13:43 PM »

As for Eric's question on the seat, when I switched to the F tank, I remounted the brackets on the seat pan so they adjusted for the longer tank length.

754 · « **Reply #998 on:** July 06, 2016, 02:11:28 PM »

Flat side of seal goes to outside, don't use a screw to hook and pull it out..the part against tach shaft must be smooth..found out the hard way.

SKTP · « **Reply #999 on:** July 06, 2016, 02:24:53 PM »

Anybody got a picture of their tach cable seated in the head cover? I swear mine use to go in more...but I might be remembering wrong

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Author Topic: 1978 CB750K — Post 836 OIL PRESSURE - Hopefully Good!? (Read 251240 times)