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FAQs

What is the recommended safety screw gap for a Lucas K series magneto?

According to the relevant Lucas Workshop Instructions, the gap should be between 6.5 and 7.5 mm (0.256" and 295" - 1/4" and 19/64") from the tip of the screw to the slip ring.

We favour the higher value, especially if the engine has a high compression ratio, so as to avoid any unnecessary jumping to the safety screw.

If you shorten the screw so as to achieve a larger gap, the tip of the screw should be rounded.

Do not enlarge the safety screw gap above the higher recommended value, otherwise you may encounter the problems discussed under our FAQ What do safety screws do?

 

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