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Horwood Bagshaw Timing - Help Needed


Hi All,
I have a gentleman with a HB 6hp OFG fitted with a Lucas RS1 magneto.
He is seeking help with regards to setting the ignition timing.
He has a manual for this engine but it does not help him. As he cannot find any "timing marks" on the crank gear or crank driven gear??
(I didn't think there were any marks what-so-ever on these gears)

Any info that I can pass on regarding his problem would be greatly appreciated.
Thank you for your time
Best wishes,