Author Topic: 1976 CB550F1 (what have I let myself in for) Project  (Read 31124 times)

Offline eight0

  • SOHC Expert
  • Posts: 277
    • View Profile
Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #135 on: February 21, 2021, 04:59:51 PM »
Success!!!

[ Guests cannot view attachments ]

Thanks for the help everyone.

Offline K2-K6

  • Grogu
  • *
  • Posts: 5234
    • View Profile
Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #136 on: February 21, 2021, 05:40:12 PM »
Nice work, great when a project gets into the building phase too.

Offline eight0

  • SOHC Expert
  • Posts: 277
    • View Profile
Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #137 on: February 21, 2021, 06:02:08 PM »
Nope, it was really easy. So much easier than the way I was going to do it.

Couldn't help mocking it up. Still need to paint the head.

[ Guests cannot view attachments ]

Offline SteveD CB500K0

  • Administrator
  • SOHC Jedi
  • Posts: 4442
  • Ride on the Steel Breeze...
    • View Profile
    • Steve's Blog
Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #138 on: February 22, 2021, 07:56:08 AM »
Isn’t that a Zero logo?

Going electric?


Sent from my iPhone using Tapatalk
2022 Tiger Sport 660
1971 CB500K0

Offline eight0

  • SOHC Expert
  • Posts: 277
    • View Profile
Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #139 on: February 22, 2021, 09:09:44 AM »
An 0 in an eight sided shape. ;)

My surname is Hayto. My grandad used to make home cine films and call them 'eight-0 films' so that's where it came from.
This bikes not one I'm planning on selling.

Offline SteveD CB500K0

  • Administrator
  • SOHC Jedi
  • Posts: 4442
  • Ride on the Steel Breeze...
    • View Profile
    • Steve's Blog
Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #140 on: February 22, 2021, 11:05:21 AM »
I was wrong anyway

It’s a Z in a 0




Sent from my iPhone using Tapatalk
2022 Tiger Sport 660
1971 CB500K0

Offline eight0

  • SOHC Expert
  • Posts: 277
    • View Profile
Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #141 on: February 23, 2021, 07:17:44 PM »
Got the pistons on. Is there a desired order of piston ring gaps in terms of orientation?

And before anyone says I have the pistons in the wrong order.. the machinist couldn't work out which was the front of the block so labelled them back to front.

[ Guests cannot view attachments ]
« Last Edit: February 23, 2021, 07:21:30 PM by eight0 »

Offline eight0

  • SOHC Expert
  • Posts: 277
    • View Profile
Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #142 on: February 24, 2021, 09:08:20 AM »
Thanks Ken. No, not genuine, they are from DS. I do regret not spending a bit more on the pistons. I got the machinist to bore all to 0.25 over and as a last minute thought when I went to collect it gave him a piston to check all was good.
It was out by a 'few thou' apparently. I gave him all four pistons and none of them fit. Luckily they were all larger than they should be so he was able to save it and re-bore each cylinder to match each piston and did it without charge.

Offline eight0

  • SOHC Expert
  • Posts: 277
    • View Profile
Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #143 on: February 26, 2021, 01:16:07 PM »
I just got the barrels on, but it was really tough to get it on. Pistons 2 and 3 go in fine, then the outer ones really seem to seaze it up. I had to really tapp it down with some wood but I cannot turn it over and have all 4 pistons move, the middle two do but the outer ones seem stuck. Should they be that stiff?

I took it off after the first time because I was worried I was jamming a ring into the wall, but everything looked fine.

I guess when I bolt the head on and am able to use more force they would move.

[ Guests cannot view attachments ]

Offline mickwinf

  • SOHC Master
  • Posts: 1737
    • View Profile
Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #144 on: February 26, 2021, 02:46:40 PM »
there is something wrong if it wont turn over easily, has the cam chain jammed at the crank end? you would have to hold it up and make sure it is on the teeth on the crank.
Love the 500 and 550 have a 500 called Lazarus under restoration

Offline eight0

  • SOHC Expert
  • Posts: 277
    • View Profile
Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #145 on: February 26, 2021, 02:51:13 PM »
It turns over fine, it's definitely the pistons that are holding it up.

When put some force into it, pistons 2 and 3 move but rather than pistons 1 and 4 moving, it lifts the whole head up

Offline Nurse Julie

  • 1977 CB550/4 Mongrel Brat. 1974 UK 500/4 K1. Honda CD250u.
  • Grogu
  • *
  • Posts: 8206
    • View Profile
Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #146 on: February 26, 2021, 02:55:45 PM »
With your hand on the barrels with all your body weight holding the barrels down, the crank should rotate and the pistons should go up and down easily. Did you oil the bores and what was the piston to bore clearance done at when re bored?
LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline eight0

  • SOHC Expert
  • Posts: 277
    • View Profile
Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #147 on: February 26, 2021, 02:56:13 PM »
In fact, you can actually see the pistons 1 and 4 are not centered whilst 3 is. (Ignore the numbers written on the pistons)

[ Guests cannot view attachments ]

[ Guests cannot view attachments ]

[ Guests cannot view attachments ]

Offline eight0

  • SOHC Expert
  • Posts: 277
    • View Profile
Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #148 on: February 26, 2021, 03:04:01 PM »
I did lubricate them yeah. Just managed to get it to turn over a bit easier doing as you say Julie, but it still seems a lot harder than it should be. 
I gave the machinist a print out from the shop manual so I would hope the clearance was done to spec. Maybe I should check the ring gaps.

Offline Nurse Julie

  • 1977 CB550/4 Mongrel Brat. 1974 UK 500/4 K1. Honda CD250u.
  • Grogu
  • *
  • Posts: 8206
    • View Profile
Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #149 on: February 26, 2021, 03:07:18 PM »
I did lubricate them yeah. Just managed to get it to turn over a bit easier doing as you say Julie, but it still seems a lot harder than it should be. 
I gave the machinist a print out from the shop manual so I would hope the clearance was done to spec. Maybe I should check the ring gaps.
If they are original Honda pistons, then yes, the spec in the Shop Manual will be correct. If they are aftermarket, the spec in the Manual is of no relevance. Although you wouldn't really notice the difference until the engine is running and hot.
LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

 

SimplePortal 2.3.5 © 2008-2012, SimplePortal