50 HP Yamaha Tach problem

Da Bay Bye

Active Member
Just looking for advise on a Tachometer issue with my 1987, 50 Hp Yamaha, 2 cycle. Motor starts fine and runs fine but my tach just pegs hard over when it starts and just stays there. When I shut the engine off, the tach goes back to zero. I like to use the tach to gauge my trolling speed.

I disconnected my battery to see if that would rest the tach but no luck.

Any suggestions

Thanks
 
I think the tachometer uses the the charging system to work. Have a look at the regulator, there might be a small green wire there, that I think is for the tach. Make sure all the connections are clean and not corroded.Hopefully a person with more knowledge will chime in.
 
Check the rectifier. I have an older Merc that did the very same thing. Mine was about $40 and took about 5 minutes to change.
 
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