OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Briggs & Stratton Engines Coil for B&S motor help

Hello everyone!

I recently acquired a Scott Bonnar cylinder mower with a Briggs motor.
Everything seems to be there apart from the coil.
I was hoping that someone could identify the motor and tell me which coil I need to get.

So far I've not seen any serial numbers anywhere on the motor and all I have are these pics.

The Model, Type and Code should be stamped on the cooling air cowl, just near the carburetor/intake port. If you post those we can help you with information about the engine, including the part number of the ignition unit.

The air vane governor and associated parts are missing in the photograph - I take it you removed those yourself.

Very good, I shall go and have a look.

Cheers.

Model: 80202
Type: 0880-01
Code: 80030303

Dunno how I didn't see that before....

The engine was manufactured on 3 March 1980, in Briggs' Rolla, Missouri engine plant. Because it was made before 1982, it has a breaker points ignition system. You may wish to consider fitting the later electronic ignition module (called Magnetron) which eliminates the points and condenser. You can probably obtain either the old or new unit second-hand by posting details in the Outdoorking Wanted forum.

Here is the Illustrated Parts List:
http://bsintek.basco.com/BriggsDocumentDisplay/Z6jmyBVJ1DajI.pdf

Here is the Operator's Manual:
http://bsintek.basco.com/BriggsDocumentDisplay/flivAJX-nfBhU7y.pdf

You will see that the part number of the original coil is 298502 (the reference number on the exploded diagram is 333, and you will find the corresponding part number on page 24 of 28. Your Type No. is not one of those listed as requiring coil p/n 298274).

Cool, thanks for the info!



Hmmm, no I didn't pull anything off it, this is how it was when I got it.
Is that the small piece of thin steel with some holes in it?
I mostly play with 2-strokes so this is all a bit new to me.



See, the guy I got it off had bought it, couldn't get it to go, someone told him it was the coil so for some reason he pulled the whole mower to bits.
All the sprockets, nuts, bolts, chains etc were in the catcher.

Then he gave up when he couldn't get a coil from anywhere and gave the disassembled mower to me....

So... is this Magnetron thing a "One Size Fits All" kind of deal or what's the go there?

The governor vane is outlined in green, and the coil in red. This is from page 3 of the IPL.

The moving vane's lever (low left of the governor vane) is connected to the governor's speed control lever by the governor spring, and to the carburetor's throttle butterfly by a wire link, like this:


There are at least two different Magnetrons, depending on flywheel size etc. You need one that suits your engine model.

You seem to be missing enough bits for this rebuild project to be getting a bit tricky unless you can see an assembled 80202 engine, probably on a Scott Bonnar 45, since that seems to be where most of them are.

Ah yep I just went and had a look and I do have the governor vane.

Just one more thing... do I need the original coil to fit the Magnetron?
Does it go ON the coil or replace it?



Thanks again.

The Magnetron replaces the original coil. It looks just like the coil except it has a little black blob hidden inside the laminated yoke, which triggers the spark from the changing flux as the flywheel magnet goes by. Replacing a magneto coil with a Magnetron is a B&S-approved standard service operation.

Not sure what's going on here.... I keep getting logged out as I move around the forum.

So I'm after something like this then:
>>COIL<<

Anyway, thanks again Grumpy.
You've been most patient and helpful.

You'll be hearing from me soon again, no doubt, when I come across the next issue with this project.


Cheers, Platypus.

I do not recommend using an aftermarket product like that - I suggest you just fit a regular production Magnetron, preferably second-hand.

Now you're confusing me again...

What do you mean by "regular production"?
And why second hand?



I used that one for illustration purposes only by the way, it was the first one that popped up.



.

Magnetrons are fairly expensive new, but there is one in every old clapped-out Briggs made since 1982. They rarely fail, so there are literally thousands of them out there on junk engines. They look and fit the same as your old coil did, you just remove the wire to the points since you don't need it any more.

Because there are more Magnetrons than coils out there in the world, chances are you can get a used Magnetron cheaper than a used coil. Of course if you want to you can buy a new coil and fit it, it will work just as well as a Magnetron, but you will have a few extra components that might eventually give trouble. For example, ignition condensers are somewhat prone to failing when they get very old. On your engine the points and condenser are located inside the flywheel, so you have to remove the flywheel to service them - not terribly difficult, but it is a bigger job just to check the points gap than it is to completely replace a Magnetron.

Fair enough.

I'll be posting a thread on the mower itself soon as I've started doing a dummy assemble and there's a few things that don't seem right or maybe missing.
Interesting setup with all the sprockets and chains.

Oh and you were right, it's a Scott Bonnar 45.
Keen to get this thing going and lay down some stripes on the lawn.




Cheers.