Author Topic: 1978 CB550 K3 "running" restoration  (Read 12090 times)

Offline SPR

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Re: 1978 CB550 K3 "running" restoration
« Reply #165 on: June 21, 2020, 08:50:20 AM »
Careful with the tappet, i chased a loose tappet for a few hours till i nipped up the exhaust gaskets!!

Yep - that is what Ken said so checked they were all tight first ...

The problem I have is my ear didn't pick anything up :) so may not know if I was successful till someone more knowledgeable has a listen again

Simon

Offline SPR

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Re: 1978 CB550 K3 "running" restoration
« Reply #166 on: June 21, 2020, 09:20:53 AM »
Did you find any out of adjustment?

Really tidy bike that Simon, looked very nice indeed.

Best bet for making sure the exhaust gaskets seal properly is too loosen off the rear bolt so the back end can float a little and then tighten the front nuts up, you can twist the exhaust out of shape tightening the back bolt up first especially if you've got the hanger positioning wrong which is quite easy to do on the 500, not so sure on the 550K3 can't remember how they fitted now.  Try loosening all the nuts/bolts a little and doing the fronts up first.

I think 2/3 were a fraction loose so did them as you said after bending the feeler gauge so the end was perfectly flat when adjusting.

Yep slackened the brackets slightly before nipping up the bolts - a couple did nip up a full turn - I suspect I'm over cautious when doing them up

Offline SPR

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Re: 1978 CB550 K3 "running" restoration
« Reply #167 on: June 21, 2020, 09:37:28 AM »
Maybe a job when you've got the head off?

Ha ha ... good joke :)

Offline SPR

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Re: 1978 CB550 K3 "running" restoration
« Reply #168 on: June 29, 2020, 01:11:00 PM »
Need some assistance please ....

So was checking poor cold starting and found choke mech spring bit was sticking and not moving butterfly’s

Carbs off and found that spring plate was twisted - straightened and all ok

Thought whilst carbs off would remove bowls and check float heights etc again

Now - next is going to sound stupid ... I suddenly noticed the slow jets are different sizes ? Two outer ones are visually bigger than the inner ?

Is it me going mad or are they wrong ? Tried to pull them out but failed so any help would be appreciated

I’ve attached pics to hopefully show the problem




Offline SPR

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Re: 1978 CB550 K3 "running" restoration
« Reply #169 on: June 29, 2020, 01:17:21 PM »
I've managed to get a couple pics of the jet sizes - the middle two are correct at 42 but both outers are 35 ?

So I can only assume these have been replaced incorrectly when the bike was done front to back inc the carbs cleaned etc  ::)

Has anyone got 2 x 42 slow jets or point me to where I can get some from

I'm also assuming this won't have helped me try to get the bike idling and starting easily ... it does however run great :)

Offline Bryanj

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Re: 1978 CB550 K3 "running" restoration
« Reply #170 on: June 29, 2020, 01:59:47 PM »
Only place i know does the jets is siriusconic in canada.

Offline SPR

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Re: 1978 CB550 K3 "running" restoration
« Reply #171 on: June 29, 2020, 02:08:29 PM »
Only place i know does the jets is siriusconic in canada.

Brilliant thanks - ordered a set of #42

Offline SPR

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Re: 1978 CB550 K3 "running" restoration
« Reply #172 on: June 29, 2020, 04:12:33 PM »
Whilst you've got the carbs like that I'd suggest carefully removing the air (mixture) screws, screw them down first so they LIGHTLY touch down, count the turns it takes do this so you know where to put them back so they are in the same place. Then remove and inspect, check to see if the o-rings are ok and the springs in place along with the tiny washer, most importantly check the condition of the tip, is it intact, do they all look the same, people tend to ground them too hard and the tip breaks off inside the carb, might as well check now whilst it's easy to do. Should be screw, spring, washer, o-ring. Look down the holes to see if any have got stuck down there if they come out with some missing.

Thanks Ken ... just had them off and double checked what you said - I'd previously changed o rings but checked everything again and all looks good

Offline SPR

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Re: 1978 CB550 K3 "running" restoration
« Reply #173 on: June 29, 2020, 04:16:35 PM »
Good news. If you go to a big Asda they sell tins of compressed air (if you haven't got a compressor), give all the galleries a good squirting, I turn the can upside down so it comes out as liquid oxygen, you can actually see if come out then, compare each carb with the next so you know where it should be escaping, if it changes you have a blockage.

Excellent !! thanks - on it

Offline SPR

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Re: 1978 CB550 K3 "running" restoration
« Reply #174 on: June 29, 2020, 04:21:29 PM »
They are stocked where the mobile phone accessories are Simon.

Ha ha - I would have been searching for hours !!

Offline SPR

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Re: 1978 CB550 K3 "running" restoration
« Reply #175 on: June 29, 2020, 04:41:05 PM »
It's called Fellowes Air Duster BTW.

Thanks again

Offline SPR

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Re: 1978 CB550 K3 "running" restoration
« Reply #176 on: July 04, 2020, 05:32:27 PM »
So after the heads up from Bryan the new jets from siriusconic  in Canada arrived in 4 days !! Can't fault that

All assembled and refitted and fingers crossed it looks like no overflow / petrol leaks and only one air leak which was me not tightening up a clip

Used the aux tank as the proper one is at the painters and it started immediately which I suspect is a combination of the choke now actually not sticking and working and jets all the same size

Thanks everyone for the help again !!

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Offline SPR

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Re: 1978 CB550 K3 "running" restoration
« Reply #177 on: July 21, 2020, 01:42:51 PM »
Honda man Mark electronic ignition arrived and even I was able to fit in about 15 minutes

Still can’t road test as the tank isn’t back but using aux tank it started first press after about 4/5 days not running

Seems to rev freer but that maybe imagination :)








Offline SPR

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Re: 1978 CB550 K3 "running" restoration
« Reply #178 on: July 21, 2020, 02:16:14 PM »
That's odd, Mark said the new version took it's power from the look AFTER the ignition switch so the box was dead when the keys removed. That's permanently live by the look of it.

Any customs charges Simon? Post Office usual £8 robbery?

This may be a dim reply .... it gets power from where the coils black / white wire joins the loom ?

No customs / delivery charges

Offline SPR

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Re: 1978 CB550 K3 "running" restoration
« Reply #179 on: July 21, 2020, 02:22:30 PM »
So there's an additional live feed from where you've connected it to the battery direct? and it's switched via the black/white near the coils, can't read the instructions as they are upside down so I don't know exactly how it's wired in, I was just going off Marks wiring diagram he sent me. He said he'd altered it so it switched on/off with the ignition, which is why I queried the battery feed.

No direct feed to the battery - that is my trickle charger connection

 

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