Author Topic: 1978 Honda CB550K: Project *Education* Now W/ Video  (Read 17390 times)

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Offline Stev-o

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Re: 1978 Honda CB550K: Project *Catchy Name TBD*
« Reply #25 on: December 04, 2010, 08:24:56 AM »
Answer...C.

The wheel will need to be trued.
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline fastbroshi

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Re: 1978 Honda CB550K: Project *Catchy Name TBD*
« Reply #26 on: December 04, 2010, 01:46:04 PM »
Those forks being bent does concern me, not sure what would be considered serviceable or not.  Considering the drastic change in handling a 1mm raise of the fork tubes in the triple tree does, I'd ask around to see if it's a problem. 
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Offline Zaipai

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Re: 1978 Honda CB550K: Project *Catchy Name TBD*
« Reply #27 on: December 04, 2010, 08:30:00 PM »
I will look thru the garage tomorrow and see if I have a spare front rim. I believe I do. If so I can ship it to you.

Good work so far.

As for the wiring, here is a good color chart you can follow.



TTYS,
.: Scott :.
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Offline OneWheelDrive

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Re: 1978 Honda CB550K: Project *Catchy Name TBD*
« Reply #28 on: December 05, 2010, 10:39:44 AM »
Thanks Scott!  That would be epic.  And thanks for the wiring diagram, that will be helpful!

I finally bought a clearance gauge and I'm well within spec on all rings  ;D.  Too bad I had to learn the hard way that the lower rings are damn sharp!

Methinks now I need a valve job, however, as I put some seafoam in the cylinder heads and had some significant leakdown (leakup?) out of 2 exhaust valves, and a dribble or two from two intake valves.  I suppose I could do this work on my own and lap the valves, but I've heard that there's a small engine repair shop about 30 minutes from me that will do it for 100 bucks.  Worth it?

I'm not terribly concerned about the slight bend in the forks.  I have grander plans for the front end after I get the bike running, so the forks won't be on there long.  The motor however, needs to be perfect, so I think the professional valve job may be worth it in the long run.

Oh, by the way Steve-O, the answer is B  ;).  Don't run from the po-po!
1975 CB550 cafe
1971 CB500 stocker
2008 Ducati Hypermotard 1100S *sold*
1973 CB350F *sold*
1975 CB550K Project "Keeper" *sold*
2010 Ducati Monster S4RS *sold*
1976 CB360T *sold*
1974 CB550K *sold*
1973 CB750K *sold*
1978 CB550K *sold*
2007 Vespa LX150 *sold*

Offline OneWheelDrive

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Re: 1978 Honda CB550K: Project *Catchy Name TBD*
« Reply #29 on: December 07, 2010, 09:47:02 AM »
Any suggestions on the state of my valves?  Should I try my hand at it or outsource the rebuild of the valvetrain?
1975 CB550 cafe
1971 CB500 stocker
2008 Ducati Hypermotard 1100S *sold*
1973 CB350F *sold*
1975 CB550K Project "Keeper" *sold*
2010 Ducati Monster S4RS *sold*
1976 CB360T *sold*
1974 CB550K *sold*
1973 CB750K *sold*
1978 CB550K *sold*
2007 Vespa LX150 *sold*

Offline fantino

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Re: 1978 Honda CB550K: Project *Catchy Name TBD*
« Reply #30 on: December 07, 2010, 01:17:02 PM »
Try cleaning up and lapping the valves yourself. If that doesn't seal things up then outsource it to get your seats recut. All you need is lapping compound and a small piece of fuel line to lap em' yourself :-)

Offline Zaipai

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Re: 1978 Honda CB550K: Project *Catchy Name TBD*
« Reply #31 on: December 07, 2010, 04:48:58 PM »
After looking thru my garage all I have are 2 rear rims.. Sorry man.. However that means I now have to get one because the one i have on the bike is kinda bad..

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Offline Stev-o

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Re: 1978 Honda CB550K: Project *Catchy Name TBD*
« Reply #32 on: December 07, 2010, 05:01:47 PM »
After looking thru my garage all I have are 2 rear rims.. Sorry man.. However that means I now have to get one because the one i have on the bike is kinda bad..

.: Scott :.


Here's one for $50:

http://cgi.ebay.com/ebaymotors/HONDA-CB-550-FRONT-WHEEL-RIM-_W0QQcmdZViewItemQQhashZitem33616c8b4dQQitemZ220677835597QQptZMotorcyclesQ5fPartsQ5fAccessories
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline OneWheelDrive

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Re: 1978 Honda CB550K: Project *Catchy Name TBD*
« Reply #33 on: December 07, 2010, 05:14:21 PM »
Thanks anyway Scott.  I can have a shop try to true the wheel when I get tires in the next stage of the build.

Tonight I'm moving forward with the assembly!  According to fedex I've got OEM head gaskets, a sealed battery, OEM seat, mint sidecovers, fuse panel (Thanks Seth!) all sitting on my doorstep!  I also bought copper gasket prep spray and valve lapping compound, and borrowed a cylinder hone tool and valve compression tool from Pep Boys so it looks like I'm good to go!  I'm not replacing valve guides, but the seals if necessary.  Pictures to follow!  Am I forgetting anything?
1975 CB550 cafe
1971 CB500 stocker
2008 Ducati Hypermotard 1100S *sold*
1973 CB350F *sold*
1975 CB550K Project "Keeper" *sold*
2010 Ducati Monster S4RS *sold*
1976 CB360T *sold*
1974 CB550K *sold*
1973 CB750K *sold*
1978 CB550K *sold*
2007 Vespa LX150 *sold*

Offline OneWheelDrive

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Re: 1978 Honda CB550K: Project *Catchy Name TBD*
« Reply #34 on: December 07, 2010, 05:17:49 PM »
Oh, I forgot to mention, when I was reinstalling my rings after measuring the end gaps, two of the rings did not have markings so I didn't know which way to install them.  They look symmetrical from profile, any consequence if they go in backwards?
1975 CB550 cafe
1971 CB500 stocker
2008 Ducati Hypermotard 1100S *sold*
1973 CB350F *sold*
1975 CB550K Project "Keeper" *sold*
2010 Ducati Monster S4RS *sold*
1976 CB360T *sold*
1974 CB550K *sold*
1973 CB750K *sold*
1978 CB550K *sold*
2007 Vespa LX150 *sold*

Offline Zaipai

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Re: 1978 Honda CB550K: Project *Catchy Name TBD*
« Reply #35 on: December 07, 2010, 06:26:35 PM »
I wish I knew about the rings, I have not had to deal with that yet. I don't have the shop or tools to deal with that, so I send them out to be done. It may be cheaper just to grab a decent rim from ebay then having the shop true it. Glad you have the parts, its like Christmas when the boxes show up!

.: Scott :.
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75 CB550F  | 


Offline OneWheelDrive

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Re: 1978 Honda CB550K: Project *Catchy Name TBD*
« Reply #36 on: December 08, 2010, 11:07:01 AM »
So last night I got to most everything I had time for, was up till 3:30 am, having a blast.  Installed front end, wheels, brakes, wiring harness (incorrectly I think), tach and speedo, airbox, battery, rear fender and misc.  Also hones the cylinders to a nice 45 degree crosshatching.

Tonight I'm gonna lap the valves and reassemble the motor.  In removing the valves, I found that #4 exhaust valve was ever so slightly bent, causing it to unseat.  I stole the best looking exhaust valve from my donor motor and I'll be using that one when lapping and upon reassembly. 

Also, is an acetone wipedown the correct prep for the head gasket mounting surface before I hit it with copper prep spray?  Only spray the gasket surface?  Do I spray the cylinder base gasket as well as the head?
1975 CB550 cafe
1971 CB500 stocker
2008 Ducati Hypermotard 1100S *sold*
1973 CB350F *sold*
1975 CB550K Project "Keeper" *sold*
2010 Ducati Monster S4RS *sold*
1976 CB360T *sold*
1974 CB550K *sold*
1973 CB750K *sold*
1978 CB550K *sold*
2007 Vespa LX150 *sold*

Offline geminimotors

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Re: 1978 Honda CB550K: Project *Catchy Name TBD*
« Reply #37 on: December 08, 2010, 06:13:19 PM »
I have a nice set of oem 78 side covers and a very nice set of correct emblems. Drop me a line if you decide to go that route. Cheers, -Mike geminimotors@gmail.com

Offline OneWheelDrive

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Re: 1978 Honda CB550K: Project *Catchy Name TBD*
« Reply #38 on: December 09, 2010, 02:42:47 PM »
I did receive a set of covers in great shape from a member in AZ.  Thanks though Mike.

Successes and frustrations in the last few days as I reassembled the top end of the motor.  The valve lapping went well, had to get creative with an automotive valve spring compressor, but got it figured out.  Reinstalling the valves without the proper tool was much more difficult that removing them.  The compressor didn't apply pressure squarely to the retainer cap so it was damn hard to get the valve stem retainers to grab the stem. 

That wasn't the issue however, after putting the cylinder and head all together, and getting the cam and chain installed how I thought was correctly, I'm having issues with tappet adjustment.  No matter which cylinder, 1 or 4 is at TDC, I can't get both exhaust and intake rockers to be loose to adjust them.  I've posted a topic in the SOHC4 section, but feel free to give advice if you have thoughts.  I'm committed to getting the thing on the road this weekend!
1975 CB550 cafe
1971 CB500 stocker
2008 Ducati Hypermotard 1100S *sold*
1973 CB350F *sold*
1975 CB550K Project "Keeper" *sold*
2010 Ducati Monster S4RS *sold*
1976 CB360T *sold*
1974 CB550K *sold*
1973 CB750K *sold*
1978 CB550K *sold*
2007 Vespa LX150 *sold*

Offline OneWheelDrive

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Re: 1978 Honda CB550K: Project *Catchy Name TBD*
« Reply #39 on: December 09, 2010, 09:34:25 PM »
Problem = solved, Pete = retard.  Of course I tried to install the cam notch level when on the 2,3 T mark.  The build continues!
1975 CB550 cafe
1971 CB500 stocker
2008 Ducati Hypermotard 1100S *sold*
1973 CB350F *sold*
1975 CB550K Project "Keeper" *sold*
2010 Ducati Monster S4RS *sold*
1976 CB360T *sold*
1974 CB550K *sold*
1973 CB750K *sold*
1978 CB550K *sold*
2007 Vespa LX150 *sold*

Offline OneWheelDrive

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Re: 1978 Honda CB550K: Project *Catchy Name TBD*
« Reply #40 on: December 10, 2010, 09:44:20 AM »
So I was able to adjust all tappets yesterday, it was easy-breezy with the cam in the right spot!

Wrestled with the motor till very late last night, but finally got it all mounted!  Basically used ratchet straps from the ceiling to swing it into place.  I'm glad I don't have a freshly painted frame or motor though.  I don't know how you guys get 'em in and out without destroying your freshy paint jobs!

The PO didn't include a few of the hanger bolts, so I'll have to source a couple, but it was still enough to get it all in there firmly. 

Sorry for the lack of pictures, the time seemed to fly by and I had my head down makin' progress and couldn't touch my camera with my greasy hands.  I'll take some pics tonight before I get started again.  Hopefully it'll be running soon.  The next challenge is the electrical!!
1975 CB550 cafe
1971 CB500 stocker
2008 Ducati Hypermotard 1100S *sold*
1973 CB350F *sold*
1975 CB550K Project "Keeper" *sold*
2010 Ducati Monster S4RS *sold*
1976 CB360T *sold*
1974 CB550K *sold*
1973 CB750K *sold*
1978 CB550K *sold*
2007 Vespa LX150 *sold*

Offline Zaipai

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Re: 1978 Honda CB550K: Project *Catchy Name TBD*
« Reply #41 on: December 10, 2010, 08:13:43 PM »
You could make it easier on your self. Do what I did, place some blankets on the floor, and 2 wood boards to sit under the low spots on the motor, then place the bike on the floor, and then once the bolts are removed, lift the frame off, just repeat in reverse to place it back in. Its easy peasy and no scratching the frame. The key is to make sure the floor is padded, and lower the bike slowly to the floor.

Oh and I did put blue painters tape on the frame before putting the motor back in just in case.

.: Scott :.
« Last Edit: December 10, 2010, 08:16:12 PM by Zaipai »
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Offline OneWheelDrive

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Re: 1978 Honda CB550K: Project *EDUCATION*......AND SHE'S ALIVE!!
« Reply #42 on: December 11, 2010, 08:33:58 AM »
I definitely would have done that, however, the motor was the last thing to go in, making the bike too heavy to maneuver over the motor.

GREAT NEWS!!  THE BIKE LIVES!!  I put in about 7 straight hours last night of final assembly, made sure she had air, fire, and fuel, and pushed the button.  She turned over and ran in like half a rotation!!  I definitely ran into some snags along the way that made my journey tricky.  The major one was concerning both throttle cables.  The PO, when I bought bike had said, "oh, i bought these new throttle cables cuz the old one's were pretty old".  Of course, he didn't know that although his bike was indeed a '78, it had carbs from a '74.  This rendered the new cables he ordered for the '78 pretty incorrect. 

This was literally my last item on the to do list and I faced with the option of throwing them away and ordering new ones, or trying to be creative and completing the rebuild, I got out the vice grips and tin snips to see if I could make 'em work.  The problem was that the cable length relative to the sheath was too short, making them not able to reach the throttle arm.  I measured the additional length I needed and cut off the sheath to that length. 

Now, never seeing the inside of a throttle cable, I didn't really know what to expect, but inside was essentially a thin plastic cover over the cable itself, and the thin cover was wrapped in a coil of very hard steel.  All I needed to do was uncoil the steel, snip off the excess, replace the end cap, and I was good to go.  Trimmed both, put them back on the bike, and the next thing I knew I had throttle control!!

Next I filled her with oil, gave her about a dozen kick start kicks to get the blood flowin', then turned the key and hoped for the best.  Now mind you that this is now 12:30 in the morning, and I live in a small duplex that shares a wall through my garage, and my neighbor was definitely sleeping.  But honestly, I had come this far and I wasn't gonna let that stop me. 

To my amazement, she roared to life!  A quick idle screw adjustment and she was purring right around 1100 rpm.  I let her warm up for about 5 minutes and observed the beauty of a running SOHC4.  Looked like there was a little exhaust leak on the 2nd pipe, but I kinda expected that as the second bolt is damn hard to reach.  I struggled to tighten it and it appeared to crush the gasket sealed.  Lucky for me I live in Southern California so I was able to push it outta the garage and take her for the maiden voyage.  It was probably a bit irresponsible as I had not yet connected the brake or headlights :o, but my neighborhood was dead and very well lit by streetlights. 

My first impressions were that this bike is a great machine.  It shifted smoothly (up to 3rd at least, c'mon, no headlight remember?), was nimble and balanced, and accelerated like a beast when I grabbed a fistful.  I think I may have a carb tuning issue as there was a hesitation through the midrange of the throttle.  If I remember correctly, the needle clips were on the 2nd from the bottom, or two steps below stock.  I assumed that was because of the 4 into 1 exhaust, and that it must have been done for a reason.  I think this is causing it to run rich though.  I'll do a plug chop today when the fog clears and I get on the bike again. 

Also, I definitely need to bleed the brakes as the front was a bit spongy, functional, but spongy.  The rear seemed to work as well as I expected a 30 year old drum to work. 

The next little problem I encountered was after I pulled in to the garage i tried to shut off the bike with the kill switch, but it stayed running.  Had to kill it with the key.  If the piggyback from the Dyna S hadn't contacted the black/white wire from the coils could this be making this happen?  My other theory is that the switch contacts itself are bad, making it stay connected even when in the "off" position. 

Also, when I hooked up the rear brake light, it lights, but won't react to either the front or rear brake switch.  Any suggestions here?

Anyway, I'm very pleased with my progress so far.  Basically I picked up the bike on the November 19th, and it's running and ridable only three weeks later.  Total expenditure tally so far, as tracked by paypal:

Bike: $225
DMV registration and licence test: $62
Donor motor w/ Dyna S ignition: $130
Cleaners, fluids, tools, spark plugs, misc. NAPA expenses: $130
Ebay carb rebuild kit: $56
Seat, OEM side covers, dummy light housing, fuse panel: $150
Top end rebuild kit (with throwaway aftermarket head and base gaskets):  $42
Clutch lever: $9
Tappet adjuster and feeler gauges from partposse.com: $32
OEM head and base gaskets from PartsBandit.com: $92
Ebay crank case gasket: $12
Sealed AGM battery and tender from BikeBatts.com: $62
Exhaust copper crush gaskets: $12
Fork seals: $13
Fuel line: $8

Holy crapola, $1,047.  That's the first time I had done the math.  I definitely could have found a pretty good condition runner for that price.  But honestly, the education I received from this bike was worth every penny.  In fact, I think it just got named!  PROJECT EDUCATION  ;D ;D ;D.

Next I want to get all the functional systems working perfectly before I  :o take it apart again for the "clean and make pretty" stage.  "You're going to do what?", my wife said, amazed that after putting together the puzzle I would take it all apart again.

Oh, here are some photos:

Before


After


And some work along the way




Can you see the crosshatching?




The offending bent exhaust valve


Pre-lapping


Post-lapping


Now to get the electrical situation sorted out so I can be street legal!


Thanks sooooo much everyone for your help along the way.  I absolutely would not have dove into this project without knowing that I had this board as my guide.  There's NO WAY I would have been able to do it with just the Honda manual and parts book.  The education I received would not have been possible a decade ago without some serious guidance.  Now it's time to ride!

1975 CB550 cafe
1971 CB500 stocker
2008 Ducati Hypermotard 1100S *sold*
1973 CB350F *sold*
1975 CB550K Project "Keeper" *sold*
2010 Ducati Monster S4RS *sold*
1976 CB360T *sold*
1974 CB550K *sold*
1973 CB750K *sold*
1978 CB550K *sold*
2007 Vespa LX150 *sold*

Offline Stev-o

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Re: 1978 Honda CB550K: Project *Catchy Name TBD*
« Reply #43 on: December 11, 2010, 11:50:25 AM »
I'd "grade" you an A on this education project!! That had to be a great feeling hearing it roar to life after all your work, nice job.

Ok, now get the electrics sorted, you don't want to get a ticket.
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Greggo

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Re: 1978 Honda CB550K: Project *Catchy Name TBD*
« Reply #44 on: December 11, 2010, 12:05:36 PM »
FYI:  To change the name of your thread for the entirety of it, go back to your original posting and change the name there. 

Offline Zaipai

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Re: 1978 Honda CB550K: Project *Education*
« Reply #45 on: December 11, 2010, 01:03:16 PM »
Excellent work.  Don't worry about your wife, they never understand.. ;)

Video?

.: Scott :.
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Offline fastbroshi

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Re: 1978 Honda CB550K: Project *Education*
« Reply #46 on: December 11, 2010, 01:20:06 PM »
That was pretty fast, good job.  You've got yourself a proper bike to go cruising Pacific Beach on now.  Ok so maybe not so many folks out this time of year, but whatever.
Just call me Timmaaaaay!!!

Offline OneWheelDrive

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Re: 1978 Honda CB550K: Project *Education*
« Reply #47 on: December 11, 2010, 04:37:44 PM »
No video, but my bike sounds a bit like this http://forums.sohc4.net/index.php?topic=50015.0
1975 CB550 cafe
1971 CB500 stocker
2008 Ducati Hypermotard 1100S *sold*
1973 CB350F *sold*
1975 CB550K Project "Keeper" *sold*
2010 Ducati Monster S4RS *sold*
1976 CB360T *sold*
1974 CB550K *sold*
1973 CB750K *sold*
1978 CB550K *sold*
2007 Vespa LX150 *sold*

Offline OneWheelDrive

  • A journey of 1000 miles starts with your first carb overhaul.
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Re: 1978 Honda CB550K: Project *Education*
« Reply #48 on: December 11, 2010, 05:18:39 PM »
I'm assuming I need a vacuum sync of the carbs.  Anyone in So. Cal. with a calibration gauge wanna meet up tomorrow for some beer and carb tuning???!!?  8)
1975 CB550 cafe
1971 CB500 stocker
2008 Ducati Hypermotard 1100S *sold*
1973 CB350F *sold*
1975 CB550K Project "Keeper" *sold*
2010 Ducati Monster S4RS *sold*
1976 CB360T *sold*
1974 CB550K *sold*
1973 CB750K *sold*
1978 CB550K *sold*
2007 Vespa LX150 *sold*

Offline fantino

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Re: 1978 Honda CB550K: Project *Education*
« Reply #49 on: December 13, 2010, 02:56:28 PM »
Great to see you make so much progress so quickly. I'm jealous, haha.