"Qualcast" 43 electrickery

12 posts / 0 new
Last post
Nigel N
Offline
Last seen: 6 days 13 hours ago
Joined: 09/10/2019 - 18:53
"Qualcast" 43 electrickery

Having fun with this ole' 43 but it's defying all attempts to make it spark.

New plug, points sorted but nothing so it looks like I made need to source some parts.

is the magneto assembly available from anywhere?

 

Nigel N
Offline
Last seen: 6 days 13 hours ago
Joined: 09/10/2019 - 18:53
The image that should've been

The image that should've been above

wristpin
wristpin's picture
Offline
Last seen: 1 hour 15 min ago
Joined: 23/05/2012 - 22:09
Have you cleaned the faces of

Points sorted - meaning what ? Have you cleaned the faces of the contact breaker points? Do that and adjust the gap making sure that you don’t introduce more dirt while doing so and see where it gets you.

Nigel N
Offline
Last seen: 6 days 13 hours ago
Joined: 09/10/2019 - 18:53
Yep, had several goes at it.

Yep, had several goes at it. Clean, set, clean set. Suspect there may have been some previous fiddling. Plug cable is about as short as it could be, a bit loose at magneto end too. Not sure it would originally have been a suppressor type cap either.  One fin missing from flywheel. Contact breaker arm looking worn but still able to adjust points accordingly. Using a big croc clip to hold the plug against the head, or using an inline plug tester both demonstrates only an occasional random spark, if any.

Bought it  a while ago, pretty cheap 'cos it was advertised as  "was running fine but then wouldn't run. May be easy fix"

wristpin
wristpin's picture
Offline
Last seen: 1 hour 15 min ago
Joined: 23/05/2012 - 22:09
The HT lead should be a good

The HT lead should be a good tight fit onto its spike but might move a bit in its socket. The coil on your machine is one with the encapsulated condenser and other than a dedicated coil tester proving otherwise I would suspect that it is the cause of your problem.

Nigel N
Offline
Last seen: 6 days 13 hours ago
Joined: 09/10/2019 - 18:53
I'm coming around to that

I'm coming around to that conclusion too. 

 

Wonder where (if ) I can get the bits. Nothing showing on fleabay. GMC, maybe?  

wristpin
wristpin's picture
Offline
Last seen: 1 hour 15 min ago
Joined: 23/05/2012 - 22:09
Try Jon  Cruse at the

Try Jon  Cruse at the Hailsham Mower Centre.

 

Nigel N
Offline
Last seen: 6 days 13 hours ago
Joined: 09/10/2019 - 18:53
Cheers

Cheers

Nigel N
Offline
Last seen: 6 days 13 hours ago
Joined: 09/10/2019 - 18:53
So we've probably figured out

So we've probably figured out what doesn't work. I'm just looking around and deciding if I'm just going to replace the coil/condenser or, well, the whole assembly.

The thing is, as it stands, there's no obvious way to stop this engine once it's started. No stop/start, (too old anyway) no shorting contacts on top of the carb, no shorting strap either, although that wouldn't work on a plastic suppressor cap (as fitted) anyway. And the HT lead is too short and too tight just to flick off. I guess they must've set the idle really slow and just let it run to a stop.

Or turned off the fuel and went for a coffee..

wristpin
wristpin's picture
Offline
Last seen: 1 hour 15 min ago
Joined: 23/05/2012 - 22:09
You can’t replace just the

You can’t replace just the condenser as it’s encapsulated into the coil. That said, I’ve often wondered whether if the condenser has failed open circuit , one could just piggyback a condenser - even outside the mag. If the condenser has failed short circuit it is definitely new coil time. The coil condenser unit is Wipac S4913 / 4390, an alternative supplier is Villiers Parts

Early SIF engines did not have any external ignition grounding provision other than the metal strip to the spark plug terminal.

 

Nigel N
Offline
Last seen: 6 days 13 hours ago
Joined: 09/10/2019 - 18:53
Yeah, I knew that, honest.

Yeah, I knew that, honest. Hence the "coil/condenser".

Resistance on the primary side is pretty low so guessing adding an external condenser ain't on. 

Shame really, I did exactly that on a small generator, same value but bigger, beefier. It poked out of the side of the casing like a nose. Worked though.

I may revert to the exposed brass plug connector and a strap. Although I do like my coffee .......

Nigel N
Offline
Last seen: 6 days 13 hours ago
Joined: 09/10/2019 - 18:53
Reading another post, it

Reading another post, it appears to be THE day for ordering coils/condensers. And a new plug connector. I'll manufacture a shorting strap.