You'll need a timing light and a testpropeller... ( it can be done sailing, but it's dangerous and you have to be 2 on board...)
the maximum advance is 30°BTDC.
The setting is made by the setscrew at the portside of the engine on a bracket just under the flywheel. Loosen the nut and turn te screw. 1 turn of the screw is 1° setting. Turn out to get MORE advance, turn in to get less advance. Retighten the nut after setting.
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