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Ignition timing

castaway

New member
ok guys has been a really long

ok guys has been a really long time since i have messed with a motor or the timing at that. Trying to check the timing on 4.3 omc. Says set at 6 BTDC. The timing tab has a before and an after side on it. Which one do i use. I no this is probally a stupid question. Thanks for any help
 
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