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1992 90 hp johnson outboard idle timing

Don't know about your engine, but on the 225 setting the timing is quite involved, including many steps and procedures. Couldn't begin to do this without a manual. This may be the reason you aren't getting any replies.
 
You do not set 'idle timing', but 'pick-up timing'.
That is the point where carbs starts to open.
Check the manual for the correct setting.
 
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