Author Topic: CB500 Four K1 1972, currently mid mono-shock, working on engine (Read 9053 times)

Register · « **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?

Register · « **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.

Register · « **Reply #52 on:** January 09, 2020, 11:36:23 PM »

These goodies arrived and should delay me for a month or so.

calj737 · « **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.

Register · « **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

Register · « **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.

Register · « **Reply #56 on:** January 12, 2020, 11:52:05 PM »

Photos

Register · « **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.

Register · « **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.

Register · « **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?

calj737 · « **Reply #60 on:** March 15, 2020, 05:32:57 AM »

Simple. The tach signal is fed from the coils.

Register · « **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?

calj737 · « **Reply #62 on:** March 21, 2020, 09:48:03 AM »

One coil. It’s a wasted spark system so both coils fire constantly.

Register · « **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.

Register · « **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

Register · « **Reply #65 on:** March 22, 2020, 10:29:09 AM »

Scratch that, all sorted

Register · « **Reply #66 on:** April 05, 2020, 06:03:55 AM »

Thanks to whomever gave me this piece of advice.
Bit of welding and fit fine without the rubber washers.

Register · « **Reply #67 on:** April 08, 2020, 04:06:28 AM »

And now this lot.

Register · « **Reply #68 on:** April 09, 2020, 02:02:40 PM »

Anyone see a problem with this set up?

Register · « **Reply #69 on:** April 26, 2020, 02:33:07 AM »

Still creeping forwards.
Got to the unintelligible ugly stage.
Ricks regulator - I understand the bit where you match the 5 and 3 cables up but could anyone clarify what’s meant by the attached photo from their site......

‘DO NOT wire in at the 8P connector......’

I assumed that I just reconnect these to their other halves.
Is that not right?
Thanks

Register · « **Reply #70 on:** May 10, 2020, 02:54:33 AM »

Still struggling with the wiring but it now turns over and the oil light goes out.
Not that you can tell from the photos.
Could someone remind me when the ignition light comes on and goes off?
Currently nothing.
Thanks

Register · « **Reply #71 on:** May 17, 2020, 01:21:56 AM »

Sorry, my previous post makes no sense as I refer to ignition light but mean neutral light.

1 week later and still having no success I can't get any power at the points. I have continuity (blue and yellow) from coils to points

In summary, I have;

ignition - cranks well, oil light goes out promptly

headlight - main and low beam ok

indicators - front only, not flashing. Rears not connected

horn - makes a noise

no neutral light - bulb ok

And a spare black terminal on the harness where the coils join.

Any help appreciated thanks.

Register · « **Reply #72 on:** May 24, 2020, 01:08:44 PM »

I think I’ve got the wiring sorted. Everything works but I’m not sure it’s as it should be.

ignition on powers the starter motor but the kill switch powers the coils/points even if ignition is off?

Do I have it right?

Finally got the exhaust on.

If I can find the plug spanner I’ll have a go at staring it tomorrow.

Thanks

Register · « **Reply #73 on:** May 26, 2020, 03:55:56 AM »

Now running for first time since 2012 and in much need of a silencer.
Answered my previous question - switching the ignition off doesn’t stop the engine. Only kill switch does.

Assume I just need to find a switched power to the kill switch and that will bring everythinG to spec

Register · « **Reply #74 on:** May 26, 2020, 04:42:34 AM »

Sounds like this

News:

Author Topic: CB500 Four K1 1972, currently mid mono-shock, working on engine (Read 9053 times)