SOHC.co.uk Forums > CB750

Old coils.

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Lobo:
Truthfully, little is allowed to die in our house, which Mrs Lobo will glumly attest to.

Yesterday however, I began to refurb a worn out 1.5HP water pump (we’re on rain tanks here), which was really unnecessary as I’d bought a new replacement at very reasonable cost & slotted it in (within 15 mins) a couple of days ago.

Anyways, after 2 hrs of sweat (33 degs at the mo), wet with penetrating oil, sheared studs, plastic parts frozen into rust, ball races stuck onto corroded shaft.... and worst, the prospect of cleaning, etch priming and painting the old casing .. I gave up. Perfectly doable, but when labour / balls-ache etc factored in against replacement cost it really was a no-brainier.

A strangely lovely feeling to dump 13kg of old pump into the bin! I showered, saw your post Johnny and had to reply.
On reflection, it really would depend (for me) upon the rarity & originality of the machine in question.

AshimotoK0:
Don't want to get into a debate about it ..you make your own decision.

All I can say it I have done a few sets for Trigger, RGP750, Julie etc on here and they are people who have pretty exacting standards and their standards of restoration I truly admire..

Also investing in the clear epoxy resin kit I recommend will pay dividends as it's one of the best adhesives on the market for all other stuff. Forget Araldite, Gorilla Glue uncle Tom Cobley and all b*llocks glues..I have been using it for over 30 years and you can't beat it. Plus it can be filled with ultra fine aluminium powder or ceramic powder to create a really strong repair putty  (if you look at a CB750 early engine there are apertures blanked off at the the factory using a similar aluminium filled epoxy resin..and I have never seen it fail.. as long as the preparation is good.

I have a set of coils to do for Julie's 400/4 'Hettie'... When I do them I will try and do a video for anyone who is interested.

If I wasn't repairing them I would buy the OEM Denso ones that Yamiya sell. If the primaries of any other aftermarket ones are less than 4.5 Ohms I would dismiss them out of hand if you are using the standard points system.

smoothoperator:
Yes I'm interested as one of my coils definitely looks in need.

Trigger:
The way Ash does them is spot on.
 I have had a go myself some years ago but, i couldn't get the soldering right and it would not take. Not sure if it was my solder, flux or soldering iron was not powerful enough. I must admit that i am shite at anything electrical so, i leave stuff like that to the experts  ;)

Moorey:

--- Quote from: AshimotoK0 on December 07, 2020, 08:36:27 AM ---
I have a set of coils to do for Julie's 400/4 'Hettie'... When I do them I will try and do a video for anyone who is interested.


--- End quote ---


I for one will be interested to see it.
I have a couple of sets that could do with doing when i pull my finger out.  ;)

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