Author Topic: First start after rebuild  (Read 2236 times)

Offline DomP

  • SOHC Pro
  • Posts: 570
    • View Profile
Re: First start after rebuild
« Reply #15 on: March 09, 2024, 08:06:47 PM »
I've adjusted the tappets following the manual and refitted and adusted with a 12v light the electronic ignition today but just realised I've not released the camchain tensioner, pretty sure I should have done that first so I'll recheck it all tomorrow once I've reset the tensioner.  It's all looking very nice now though, my Delkevic is also fitted which looks so good!

My intension tomorrow is to fill with oil but put as much of the specifird volume as will fit in the oil pump, soak the filter and put some through the tappet cover holes on either side.  Remove the rocker end caps and with plugs out turn over on the kick-start, after that, plugs in and turn over in short bursts with the kill switch on until oil light goes out before attempting a full on start up.  Sound OK?

1975 XS650B
1976 CB550F1 current project
2012 Triumph Daytona 675

Offline Johnwebley

  • SOHC Jedi
  • Posts: 3239
    • View Profile
Re: First start after rebuild
« Reply #16 on: March 09, 2024, 08:10:36 PM »
Yes,



Sent from my SM-A546E using Tapatalk

lifelong motorcycle rider,and fan

Offline Nurse Julie

  • 1977 CB550/4 Mongrel Brat. 1974 UK 500/4 K1. Honda CD250u.
  • Grogu
  • *
  • Posts: 8242
    • View Profile
Re: First start after rebuild
« Reply #17 on: March 09, 2024, 08:11:55 PM »
Sounds spot on. I'm sure everything will go to plan Dom, I bet you're excited, it'll be a great feeling for you when she fires up.
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 deltarider

  • SOHC Master
  • Posts: 1371
  • My kingdom for a turkey!
    • View Profile
Re: First start after rebuild
« Reply #18 on: March 09, 2024, 08:27:35 PM »
[...] and turn over in short bursts with the kill switch on until oil light goes out before attempting a full on start up.  Sound OK?
I am not so sure short bursts will result in an extinct oil light... A tribologist has warned in his publications more than once that interrupted starts or killing the engine after a succesful start and then restart are about the worst things you can do to your engine. I assume you have prelubed parts on assembly. I'd open one or two valve covers for monitoring spats, crank the engine in one go and oil should be up there within 10 seconds.
« Last Edit: March 09, 2024, 08:36:28 PM by deltarider »

Offline DomP

  • SOHC Pro
  • Posts: 570
    • View Profile
Re: First start after rebuild
« Reply #19 on: March 09, 2024, 08:36:21 PM »
Thanks John/Julie, yes excited is definitely the word! 

By short burst deltarider I think I was more meaning stopping if the oil light doesn't go off after say 5-10 seconds and checking for oil at the end caps.
1975 XS650B
1976 CB550F1 current project
2012 Triumph Daytona 675

Offline Johnwebley

  • SOHC Jedi
  • Posts: 3239
    • View Profile
Re: First start after rebuild
« Reply #20 on: March 09, 2024, 08:49:25 PM »
Thanks John/Julie, yes excited is definitely the word! 

By short burst deltarider I think I was more meaning stopping if the oil light doesn't go off after say 5-10 seconds and checking for oil at the end caps.
The length of time depends on whether you filled the filter housing,

A couple of 10 seconds burst on the starter, should kill the oil light

Sent from my SM-A546E using Tapatalk

lifelong motorcycle rider,and fan

Offline davidcumbria

  • Such great knowledge and support on here 👍
  • SOHC Expert
  • Posts: 285
    • View Profile
Re: First start after rebuild
« Reply #21 on: March 10, 2024, 08:26:38 AM »
On my first connection of the fuel supply one or more of the float valves got stuck on the way up from the bottom and it was overflowing badly and had to close the tap.  Tapping the float bowls with a hammer shaft did the trick and I’ve never had a problem since. Suggest prepare  for this eventuality. Squirt of easy start into the plenum wouldn’t be a bad idea.
« Last Edit: March 10, 2024, 08:30:03 AM by davidcumbria »
500/4 in 79. No bikes for 30 years. 750/4 in 2013, 550/4 in 2023. Also own  R1100GS, RD350LC YPVS , Triumph Street Triple, Yamaha XT250

Online McCabe-Thiele (Ted)

  • Grogu
  • *
  • Posts: 6289
    • View Profile
Re: First start after rebuild
« Reply #22 on: March 10, 2024, 11:33:23 AM »
When the carb bowls are empty the floats  can easily stick causing flooding when you  open the tap for the first time as the float valve pin  is fully extended with the brass float part at an extreme angle.

I have found just having the bike off the stand then  rocking the bike from left to right works for me.
Honda CB500 K1 (new pit dug out ready)
Honda CB400 four super sport (first money pit)
Link to my full restoration http://www.sohc.co.uk/index.php/topic,23291.0.html

Offline DomP

  • SOHC Pro
  • Posts: 570
    • View Profile
Re: First start after rebuild
« Reply #23 on: March 10, 2024, 12:13:31 PM »
Slight issue to over come, the clutch arm has dropped and is jammed, I did notice this when stripping the engine that it could go past its pivot point and get caught.  I think I'm going to have to drop the oil to get the case off
1975 XS650B
1976 CB550F1 current project
2012 Triumph Daytona 675

Offline Johnny4428

  • SOHC Master
  • Posts: 2088
    • View Profile
Re: First start after rebuild
« Reply #24 on: March 10, 2024, 12:51:38 PM »
Put the bike on the side stand Dom before you remove clutch cover you will not lose much oil.
1952 Cymoto on Triumph bicycle.
1961 Matchless G3
1974 Honda CB550K1. Running resto,
1978 Honda CB550K3.
1999 ST1100 Pan European 50th Anniversary.
1975,1980,1984,1986 Honda C90’s
1973 Honda CB750K3

Offline DomP

  • SOHC Pro
  • Posts: 570
    • View Profile
Re: First start after rebuild
« Reply #25 on: March 10, 2024, 01:22:20 PM »
Put the bike on the side stand Dom before you remove clutch cover you will not lose much oil.

That's a good point Johnny.  Mothers Day has taken me away form the restart!😪
1975 XS650B
1976 CB550F1 current project
2012 Triumph Daytona 675

Offline DomP

  • SOHC Pro
  • Posts: 570
    • View Profile
Re: First start after rebuild
« Reply #26 on: March 10, 2024, 07:15:34 PM »
After a blondmoment with the kill switch...you can guess what I did there, it runs!   I managed to sort the clutch arm without taking the clutch cover off which was a relief, the oil light goes out almost instantly on start up so all the precautionary steps everyone suggested have worked so thanks for that! 

I will need to spend a bit of time fiddling with the carbs as it's running rich and sounding a little rough on idle, I'll try and put a video up.
1975 XS650B
1976 CB550F1 current project
2012 Triumph Daytona 675

Online Bryanj

  • Grogu
  • *
  • Posts: 10805
    • View Profile
Re: First start after rebuild
« Reply #27 on: March 10, 2024, 07:35:22 PM »
Glad to hear it mate

Offline DomP

  • SOHC Pro
  • Posts: 570
    • View Profile
Re: First start after rebuild
« Reply #28 on: March 10, 2024, 07:42:47 PM »
Glad to hear it mate

Thanks for all your help Bryan, well and Ken and many on here who've chipped in along the way, it was a great relief when it fired up.  As its not road worthy yet what should I do regarding running it in because I've yet to sort the seat and front brakes out?
1975 XS650B
1976 CB550F1 current project
2012 Triumph Daytona 675

Offline Johnwebley

  • SOHC Jedi
  • Posts: 3239
    • View Profile
Re: First start after rebuild
« Reply #29 on: March 10, 2024, 07:50:06 PM »
Glad to hear it mate

Thanks for all your help Bryan, well and Ken and many on here who've chipped in along the way, it was a great relief when it fired up.  As its not road worthy yet what should I do regarding running it in because I've yet to sort the seat and front brakes out?
Wait till its on the road,

It needs load on the engine to get it to bed in properly,
At least its running

Sent from my SM-A546E using Tapatalk

lifelong motorcycle rider,and fan

 

SimplePortal 2.3.5 © 2008-2012, SimplePortal