1934 Norton model 19 rectifier.

[Oliver 87]

I am currently trying to get my grandfathers 1934 Norton model 19 (with a later 1946 model 18 engine) back on the road. The bike is now pretty much whole again and running, although I think I may have to get the magnito restored as I have a weak spark, anyway when I stop the bike the rectifier is sticking and the amp meter drops into the minus. Currently if I put full beam on and off it is enough to unstick it. Is this a serviceable part or could I cause more harm than good bearing in mind I am no mechanic. Thanks in advance.

[iansoady]

It's not a rectifier it's a combined cutout and voltage regulator. They are user serviceable but it doesn't sound as though you are too familiar with this type of machine so probably best to try just cleaning up the points with sandpaper. If that doesn't work most people would put a modern solid state replacement in place.

When you say a weak spark, remember that at kickstart speed the spark will always seem on the weak side as mags give more output as speed increases. Generally when they start to go bad it's when they get warm.

If the mag does need work I would recommend Tony Cooper of Halesowen.

[mini-me]

not sandpaper, some very worn 400 wet and dry is enough

[Oliver 87]

Great I will give it a try thanks and thank you for the magnito recomendation

[L.A.B.]

https://matchlessclueless.com/electrical/how-it-works/lucas-voltage-regulator/