Spark Plug Caps for Atlas Lucas Magneto

jms · Jul 11, 2024

Hi All,
I am planning for now to use my Lucas magneto and will make up my own igimtion wires. The question that I have is do I use cooper core wires with NON resistor plugs and caps?

Triton Thrasher · Jul 11, 2024

Yes, unless you need interference suppression for some reason.

Mike40M · Jul 11, 2024

Agree. Most people think that magnetos works better without resistors. Copper core wires and non resistor caps is what I use on my magneto bikes. Because it is harder to find non resistor plugs nowadays.
If you have other electronics e.g. a tacho, then a resistor plug might be needed. Never use more than one resistor, resistor plugs plus resistor caps gives much weaker spark, harder to start.

jms · Jul 11, 2024

Ok thanks guys

johnm · Jul 12, 2024

I'd suggest copper core lead, no resister caps and BP7ES plugs based on using a magneto on Norton 500 twin engines.

If you do need an electronic tach then a Scitsu tach will work by attaching the pickup lead along a plug lead.

Mike40M · Jul 12, 2024

johnm said:
I'd suggest copper core lead, no resister caps and BP7ES plugs based on using a magneto on Norton 500 twin engines.

If you do need an electronic tach then a Scitsu tach will work by attaching the pickup lead along a plug lead.

The Scitsu on my Honda racer gave false readings when pickup lead was close to an ignition coil. A 3 inch gap between coil and pickup wire solved the problem.

johnm · Jul 12, 2024

Mike40M said:
The Scitsu on my Honda racer gave false readings when pickup lead was close to an ignition coil. A 3 inch gap between coil and pickup wire solved the problem.

Yes you sometimes need to experiment to get it working correctly . Plus get the correct tach. Wasted spark. Non wasted. Multicylinder etc.

Spark Plug Caps for Atlas Lucas Magneto

jms

Triton Thrasher

Mike40M

jms

johnm

Mike40M

johnm

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