So I have recently bought what I thought was a 1990 model 90hp 2 stroke Yamaha but the more I look into it the more I think it's an earlier model. I would like to adjust my timing but the manual I found online is for the newer 90hp motors and mine looks like it has an earlier system for the timing retard/advance. Thea. Looks like my timing adjust arm is at the top of the throttle control lever. Does anyone have advice, instructions or a link to an online manual for this model of 90hp? Somebody has monkey with the timing and needs to be set from start.

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