BSA 420cc

[Rig Pig]

@Robotstar5

I have started my own thread so I don't clutter the other one up.

I'm puzzled by the code on the engine coming up as 220cc capacity, it's a big old lump that drives a large Howard Yeoman rotavator, has anyone got any information on this engine? It's currently dead as the mag is stuffed and I'm stacked out with other jobs so a back burner project!

 

[The_Yellow_Ardvark]

What's is wrong with the Mag?

 

[zzr1200]

What's is wrong with the Mag?

Hmmmm..mag..spark plug....doesn't spark possibly????........

 

[merryman]

A fairly rare engine, BSA apart from the sloper, were not popular stationary engines. I would guess at that one being about the same age as BSA Bantams and the Bantam had a Wico Pacey (Wipac) magneto so I wouldn't be at all surprised if there is a Wipac behind that flywheel. Should be lots of info about Bantam magnetos on-line. Often they just need points cleaning and re-setting to get them sparking again. Watch out for left hand threads holding flywheels on. Don't know if that one is, but a lot are.

 

[Rig Pig]

This old beast has a Lucas SR 1 magneto, that is dead, haven't done much fault finding but I suspect the coil had had it.

 

[merryman]

Quite a few "Magneto specialists" who can rebuild those separate Lucas mags, with new coils etc. Very expensive though.

 

[Rig Pig]

Quite a few "Magneto specialists" who can rebuild those separate Lucas mags, with new coils etc. Very expensive though.

It's more likely to get a motorbike coil hooked up to the points and a battery stuffed in the toolbox for how often I will use it.

 

[Robotstar5]

A BSA 420 is a different beast to a Villiers I thought you had in the other thread, I believe it's a model "G".

I saw one driving a car alternator at the 2017 Stoke Prior show.

 

[ronan]

I heard somewhere recently, that to have a mag rebuilt is now around 600 notes !

 

[Robotstar5]

I heard somewhere recently, that to have a mag rebuilt is now around 600 notes !

Not sure about bike mags, but stationary engine ones can be rebuilt a lot cheaper, don't know why as some used the same mags

 

[Rig Pig]

It would be cheaper to buy a lister D and Chuck the engine away!

 

[Rig Pig]

A BSA 420 is a different beast to a Villiers I thought you had in the other thread, I believe it's a model "G".

I saw one driving a car alternator at the 2017 Stoke Prior show.

View attachment 173783

That's the one, mine is surrounded by bits of pole saw!

 

[Rannsachair]

I run Lucas SR1's on both my Matchless's most parts are available, some are not too pricey, I have used: https://www.stationaryengineparts.com/Lucas-Magneto-Spares/ rewinds are not cheap, around £100.

I have an SR1 service manual that I can scan if you want a copy.

 

[Tinbasherdan]

Our old fella had a “floataire” 3 wheeled factory truck with one of those bsa units on with a 3 speed Albion box. He also had a spare engine that came off a grain elevator