OutdoorKing Repair Forum Forums Finding and Swapping Rare Finds & Donations My Scott Bonnars

I am curios as to the function os a secondary coil though, I can see the add now:

"Enough spark to kill a moose... If you have one to spare"

The actual words sound rather like a box containing the coil, the capacitor, and the points.

I'm pretty sure there is a coil under the flywheel on this one too though.

There has to be a generator of some kind, Ty, to supply voltage to the primary of the "real" coil (which I suspect they are calling the "secondary" coil). So, rotating magnet or magnets on flywheel, single-winding coil mounted close to the flywheel (let's call it the generator coil), fairly conventional battery-ignition-type 100 to 1 step-up coil in the black box, along with the capacitor and points. Why would they do it that way? Well, one possibility would be that they had an opportunity to buy the black box and its contents from the English company that made them. If you can trace the British engine that had the similar black box in the archives, it might turn out the whole ignition system is more or less the same. Or it might not. One might still be a copy of the other, though. Meanwhile if it should turn out to be the actual British system on Jeffery's engine, he has more chance of getting parts for it.

Hi guys, as I have posted here earlier....the engine on Blumby's Model 39 was made in house by Scott Bonnar at their factory in Thebarton in South Australia....it is not a British engine.

Thanks guys for trying to help at least I know where trying to work it out.As for the push rod idea.No there's no where for a push rod and there nothing to suggest a push rod.I'm pleased to hear it was made in Australia.Just wish it still had it on it.Would love to find a catcher for it.That would be really good.

The pushrod I was speaking of would be a small plunger, probably 1/4" diameter, running directly into the crankcase from somewhere near the middle of the black box. This would be very like the plastic plunger on a breaker-point Briggs engine - you wouldn't see it unless you inspected the base of the black box fairly carefully. If it doesn't have a breaker in the box, with a plunger, where is the breaker? If you find a set of points under the flywheel, then the black box might only contain the coil. The capacitor needs to be close to the points, so I doubt it would have been in the box if the points were elsewhere.

Hi,
Maybee this is a better place to post the info you want...The gold mower your refering to...is in fact a Scott Bonnar 35,Model 201 series 2.The second series of the first rotary mower made by SB.The 3 wires you have are from the coil,they are joined via 3 x screw fittings that run to the secondry coil."Magister"then on the to spark plug.You will need a secondry coil,to run this mower,as for a spare,Ive only ever seen one intact...And I own it,I can supply you a picture if you like.they did make a few of these in a three series run,but it seems very few survived.Ive been told many times that they would over heat often,making them pretty much a failure.BUT mine runs fine,although I dont mow long grass so Ive not really tested it under load.At a guess going of the few numbers ive obtained they maybee made around 20,000 or so.Anyways I love this model and im currently restoring her now.Only missing a catcher,but i doubt id ever see one.
And the "Magister" is the "black box" some of you are refering to,its a solid state sealed coil unit that amplifies the power to the plug,simple design,but truly,In my opinon totally unecessary since there is enough room on the coil plate to run 2 victa coils.Anyways hope this answers some questions...And YES you wil be able to get an alternative of another mower to run this im very sure.
Please dismiss my previous entry on another of Blumblys posts relating to this matter

Ok have you got some pictures of this set-up?