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    ignition problem 78 40hp mercury 402

    Replaced switch box last year for a no start after warm .Ran good and worked fine . this year had it out twice .Now now power,engine running on only bottom cyl. no spark to top plug. Check wiring,no problem found. Is there something i missed causing switchbox to burn out again. Don't like the...
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    Parts question

    I need to order a switchbox for my 1978 40hp/402/mercury. I looked it up and found part#18-5787 which shows a picture but it is a little different design than my original.Could someone tell me if this is the right part? Thanks
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    Power problem

    1978 40hp Mercury. Hard to start,sometimes starts and runs fine till you shut it off for 15 or 20 minutes.Have to crank and choke engine several times before restarts and them sometimes its only running on one cylinder then the other cyl. starts firing after a minute or two.(maybe)and runs good...
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    shifting problem

    Replaced propeller in lower unit,reinstalled what I thought was the correct way but took boat out for a test and propeller worked good but forward was reverse and reverse was forward .Have not tried sugestion from threecylinder yet but will tomorrow.Thanks
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    1978 40hp Mercury 402

    Messed up.When i was replacing water impeller both shifting cams slid off.I known how they fit together but don't know if they go back on in a certain position.They seem to slide on the shaft in any positon ????????
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    Ignition timing

    Procedure for checking and adjusting timing 78 40hp Mercury.
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    1978 40hp Mercury engine

    Hard start,idles rough,cuts out high rpm.<br />no water pump action
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    1978 40hp Mercury engine

    Hard start,idles rough,cuts out high rpm.<br />no water pump action
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    40hp mercury outboard shifting problem

    Took boat out for first time.shift controls felt fine.Had reverse and forward at first.then accelerated to plane out.After about 100yds came out of gear and engine flared up.Still had reverse but clicking sound in lower unit like gears not engaged properly in forward.Boat would pull a little but...
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