Author Topic: CB500 Four K1 1972, currently mid mono-shock, working on engine  (Read 2424 times)

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Offline Register

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Re: CB500 Four K1 1972, currently mid mono-shock, working on engine
« Reply #50 on: January 03, 2020, 10:38:24 am »
Cleaned up the coils to start fitting electrics.
The one with the bracket looks original, the other is shorter and doesn’t fit the bracket.

The original coil shows resistance of 5.7 across the tails and the other 5.2.

I can’t get any reading off either coil on the plug leads.

Am I missing something or are they scrap?

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Re: CB500 Four K1 1972, currently mid mono-shock, working on engine
« Reply #51 on: January 05, 2020, 05:41:42 am »
No joy with the coils so I took a look at the rear brake.

Had to invert the cam in the drum to allow the lever to run upwards. Only fits one way on the cam splines.

Now need to fabricate something stiff to link the pull rod with the rearset.

Looks like enough room to clear the swing arm hoop.
« Last Edit: January 05, 2020, 05:44:29 am by Register »

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Re: CB500 Four K1 1972, currently mid mono-shock, working on engine
« Reply #52 on: January 09, 2020, 11:36:23 pm »
These goodies arrived and should delay me for a month or so.

Offline calj737

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Re: CB500 Four K1 1972, currently mid mono-shock, working on engine
« Reply #53 on: January 10, 2020, 04:43:32 am »
As you have no doubt heard on this forum countless times, reuse the stock brass whenever possible.
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

*** Currently experiencing life at 60 WTFs per hour ***
I always thought getting old would take longer

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Re: CB500 Four K1 1972, currently mid mono-shock, working on engine
« Reply #54 on: January 11, 2020, 01:37:23 am »
Thanks, I have also been advised to measure them for constancy across the parts in each set.

But you're right, I'll reuse what's good.

Couldn't help myself for £27 inc postage


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Re: CB500 Four K1 1972, currently mid mono-shock, working on engine
« Reply #55 on: January 12, 2020, 11:49:29 pm »
Here’s a bunch of photos of the carb cleaning and rebuild.
First a contrast with the rather too cheap far eastern parts.
Some don’t belong, others don’t fit.
There’s two main jets, one smaller and one larger than I currently have installed.
Ultimately I cleaned everything and reused it except for the O rings.
Not too much of a bargain but happy that I now know my way around the carbs.
A couple of difficult moments with one of the float bowl drain screws stuck fast and a broken double washer joining the carb linkage.
« Last Edit: January 13, 2020, 01:32:01 am by Register »

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Re: CB500 Four K1 1972, currently mid mono-shock, working on engine
« Reply #56 on: January 12, 2020, 11:52:05 pm »
Photos

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Re: CB500 Four K1 1972, currently mid mono-shock, working on engine
« Reply #57 on: January 12, 2020, 11:55:41 pm »
Photos
I’ve loads more of various stages of disassembly if anyone wants to see them.

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Re: CB500 Four K1 1972, currently mid mono-shock, working on engine
« Reply #58 on: March 09, 2020, 11:53:28 pm »
Replaced the chainring and sprocket.
Certainly reduced some of the free play at the drive shaft.

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Re: CB500 Four K1 1972, currently mid mono-shock, working on engine
« Reply #59 on: March 15, 2020, 12:41:50 am »
Not sure about this lot.
Over enthusiastic shambles on eBay.
Speedo is kph and tacho is electrical.
Off the scale incompetence.
Also looking a bit small maybe?
I can live with kph but is it poss to get a signal to the tacho some how?

Offline calj737

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Re: CB500 Four K1 1972, currently mid mono-shock, working on engine
« Reply #60 on: March 15, 2020, 05:32:57 am »
Simple. The tach signal is fed from the coils.
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

*** Currently experiencing life at 60 WTFs per hour ***
I always thought getting old would take longer

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Re: CB500 Four K1 1972, currently mid mono-shock, working on engine
« Reply #61 on: March 21, 2020, 05:25:21 am »
Thanks I’ll give that a go.
Is there any risk of half revs off one coil or do I link to both?

Offline calj737

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Re: CB500 Four K1 1972, currently mid mono-shock, working on engine
« Reply #62 on: March 21, 2020, 09:48:03 am »
One coil. It’s a wasted spark system so both coils fire constantly.
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

*** Currently experiencing life at 60 WTFs per hour ***
I always thought getting old would take longer

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Re: CB500 Four K1 1972, currently mid mono-shock, working on engine
« Reply #63 on: March 22, 2020, 01:43:23 am »
Terrific, thanks gradually getting there. Currently sorting real wheel, sprocket, chain etc.
Planning lithium battery, just working through some conflicting information or reg/rec replacement. 

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Re: CB500 Four K1 1972, currently mid mono-shock, working on engine
« Reply #64 on: March 22, 2020, 09:16:21 am »
Sheered a bolt in the clutch centre plate - part No. 22120323010.

Anyone got one for sale?

Thanks

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Re: CB500 Four K1 1972, currently mid mono-shock, working on engine
« Reply #65 on: March 22, 2020, 10:29:09 am »
Scratch that, all sorted

 

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