1991 Johnson Evinrude 9.9 Thru 30 HP Models Service Manual P/N 507946, Page 126Get this manual

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l":_.1 _ IGNlmloN' OUTPUT S;S
L!J plugs21 2 Adjust the gap the spark tester to v2 in(12 )Connecttester leads to the spark plug leadsSecue tester clip to

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