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Author Topic: CB 500 Four (1972?) Full Restoration  (Read 141198 times)

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Offline calj737

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Re: CB 500 Four (1972?) Full Restoration
« Reply #1000 on: April 22, 2016, 02:43:33 AM »
Quote from: MickB on April 21, 2016, 10:09:09 PM
I placed the leads to the plugs incorrectly, I now have coils with the plug leads too short, it's trying to start on 3 cylinders - doh!
With stock coils, your leads should all be long enough to reach the respective cylinders. Did you cut the stock wires and install new caps? Or, swap the coils left-to-right and see if the plug wires will reach that way. (If you do this, be sure to swap the ignition leads to the coils too  ;) )

You say you're trying to fire on only three cylinders? That's not a coil issue, its a plug or carb issue.
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

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Re: CB 500 Four (1972?) Full Restoration
« Reply #1001 on: April 22, 2016, 04:54:20 AM »
That thing sounds pretty good considering it came to you as a pile of parts. Congratulations are in order. WELL DONE SIR! You're nearly there 8)
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Offline MickB

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Re: CB 500 Four (1972?) Full Restoration
« Reply #1002 on: April 22, 2016, 05:49:46 AM »
Hey Bootsey, I think I put the plug in back to front. I looks to me on the schematic it should have the pointy (boss) bit facing outwards and the cover holds the plug in place?

Anyone agree with my diagnosis?
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Offline MickB

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CB 500 Four (1972?) Full Restoration
« Reply #1003 on: April 22, 2016, 05:53:52 AM »
Cal when I went to start it I didn't realise the #1 plug lead wasn't reaching the plug, thus trying to start on 3 cylinders. When I realised I put a piece of wire between the lead and the plug it started immediately.

I have cut the leads too short only on the left coil,  so a new coil is needed.

Any suggestions on which coils, doesn't have to be the most expensive.
« Last Edit: April 22, 2016, 05:55:46 AM by MickB »
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Offline calj737

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Re: CB 500 Four (1972?) Full Restoration
« Reply #1004 on: April 22, 2016, 07:14:27 AM »
You can get "stockers" from DSS. Just make sure they're 5.0 Ohm units. Upside is usually they will allow new style plug wires with removable wires/caps. Make sure if you replace the plug boots to get Resistor type too.
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline RAFster122s

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Re: CB 500 Four (1972?) Full Restoration
« Reply #1005 on: April 22, 2016, 08:35:19 AM »
I don't remember if it is PartsNMore or cb750supply that carries a nice aftermarket coils that HondaMan recommended...around $100 for a pair if I recall correctly.
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Offline MickB

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Re: CB 500 Four (1972?) Full Restoration
« Reply #1006 on: April 23, 2016, 04:20:49 PM »
Cal are these the coils you say I should use? 5 Ohm

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Offline calj737

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Re: CB 500 Four (1972?) Full Restoration
« Reply #1007 on: April 23, 2016, 04:28:59 PM »
Yes, if you buy Dyna brand. The black units are 5.0 ohm, the green are 3.0 ohm. 5s are what you want.
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline RAFster122s

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Re: CB 500 Four (1972?) Full Restoration
« Reply #1008 on: April 23, 2016, 07:09:45 PM »
The ones I mentioned were CB750Supply 
http://www.cb750supply.com/search/?q=CB-70616
should be at top of page's listing... $36 each and shipping.

David
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Offline MickB

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CB 500 Four (1972?) Full Restoration
« Reply #1009 on: April 24, 2016, 07:17:20 PM »
Sprung an oil leak from the oil plug behind the alternator (was in backwards), however does it have something to stop it popping out into the alternator cover.

The alternator cover does have a cut out where the oil plug seats.

Is there some sort of retainer/ spacer? It looks like it can pop out a little way. It looks like it should, but there's nothing showing in the schematic.





« Last Edit: April 24, 2016, 07:20:33 PM by MickB »
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Offline MickB

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Re: CB 500 Four (1972?) Full Restoration
« Reply #1010 on: April 25, 2016, 04:44:16 PM »
Can anybody help with previous posted question?
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Offline bryanj

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Re: CB 500 Four (1972?) Full Restoration
« Reply #1011 on: April 26, 2016, 01:17:37 AM »
When its in the right way round the alternator cover stops it coming out and hold the O ring in a sealing position. At least you didnt start the engine with the cover off and have to spend days looking for that plug in the dimmest darkets places
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline MickB

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Re: CB 500 Four (1972?) Full Restoration
« Reply #1012 on: April 26, 2016, 01:42:02 AM »
Thanks BJ, but the nipple fits into the little cut out in the alternator cover and there's  spot in the gasket for the plug.

It looks like it would be pushed out onto the cover and oil would leak out?

The nipple doesn't look very long to me stop the o ring from coming out too much and letting oil leak.
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Offline strynboen

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Re: CB 500 Four (1972?) Full Restoration
« Reply #1013 on: April 26, 2016, 02:15:13 AM »
you can fix the vires on old coils..just use copper type auto vire..solder the new vire inn..and epoxy the hole
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Offline MickB

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CB 500 Four (1972?) Full Restoration
« Reply #1014 on: April 26, 2016, 02:34:47 AM »
Thanks strynboen but the wires are too short and I'm looking for a brand new look.
« Last Edit: April 26, 2016, 02:51:48 AM by MickB »
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Offline strynboen

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Re: CB 500 Four (1972?) Full Restoration
« Reply #1015 on: April 26, 2016, 07:21:32 AM »
alles klar... ;)
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Offline MickB

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Re: CB 500 Four (1972?) Full Restoration
« Reply #1016 on: April 26, 2016, 07:37:01 PM »
Strynboen it's a good fix though, you should put it in Tips and Tricks
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Offline MickB

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CB 500 Four (1972?) Full Restoration
« Reply #1017 on: April 26, 2016, 09:52:03 PM »
Quote from: MickB on April 24, 2016, 07:17:20 PM
Sprung an oil leak from the oil plug behind the alternator (was in backwards), however does it have something to stop it popping out into the alternator cover.

The alternator cover does have a cut out where the oil plug seats.

Is there some sort of retainer/ spacer? It looks like it can pop out a little way. It looks like it should, but there's nothing showing in the schematic.








Back on this oil plug.

The question is why is it designed to move outwards? There is 7.21 mm from the rear of the plug to the bottom engine face, then there's the gasket with cutout to accommodate the nipple of the plug if it is pushed outwards, the cutaway in the alternator case is a further 9.22 mm. If the plug is pushed out under pressure it can move 7.21 mm max. But from the O ring's depth in the oil passage is only around 4 mm till it pops out of the passage.

What holds it in place so it doesn't pop out and leak?

I'm perplexed.
« Last Edit: April 26, 2016, 10:00:33 PM by MickB »
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Offline Bootsey

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Re: CB 500 Four (1972?) Full Restoration
« Reply #1018 on: April 26, 2016, 11:29:23 PM »
How long is the stalk piece on that plug of yours? It looks like it's seen a bit of a rough time. I'll see if I can pop the cover off mine and get a measurement of the stalk to compare.
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Offline bryanj

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Re: CB 500 Four (1972?) Full Restoration
« Reply #1019 on: April 26, 2016, 11:55:00 PM »
All i know is put it in the right way round with gasket and cover and there is no leak, BUT if that picture is of the plug I don't think its a genuine one
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline MickB

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CB 500 Four (1972?) Full Restoration
« Reply #1020 on: April 27, 2016, 12:12:31 AM »
Thanks guys, the stem's been pulled out with plyers I think, it's genuine I believe.

Bootsey thanks for the offer but don't pull the cover off.

Even when it was in backwards it stayed in place and didn't pop out, it only wobbled a little, so it was in tight enough.

I've ordered a new one plus the 3 screw in caps.

I'll wait and see what the new one looks like.
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Offline Bootsey

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Re: CB 500 Four (1972?) Full Restoration
« Reply #1021 on: April 27, 2016, 12:22:52 AM »
Mine one here measures about 6.5mm & the stalk sits about flush with the gasket surface.
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Offline MickB

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Re: CB 500 Four (1972?) Full Restoration
« Reply #1022 on: April 27, 2016, 04:13:16 AM »
I'll measure tomorrow and let you know. I'm waiting for CSMNL.
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Offline MickB

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CB 500 Four (1972?) Full Restoration
« Reply #1023 on: April 27, 2016, 04:57:40 AM »
Bootsey here's my plug





« Last Edit: April 27, 2016, 05:00:44 AM by MickB »
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Offline bryanj

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Re: CB 500 Four (1972?) Full Restoration
« Reply #1024 on: April 29, 2016, 12:06:36 AM »
If you check closely with the generator cover you will see a small curved shape  inwards towards the cast hole and the pin of the plug sits on that so does not go into the hole, the little groove that leads from the hole to outside is to let the oil out if you have a leak. Sorry the answers are a bit sporadic but the work hours are incredible at the moment and the desktop 'puter is semi dying
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!
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