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Tach acting weird

Old 04-09-2007, 04:52 PM
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Default Tach acting weird

Went out 2 weekends ago, first time this year and noticed the tach bouncing around some. Motor ran fine and sounded fine, for example at 35 knots tach normally around 4500 rpm and it was spiking over 6,000, but at idle it was in the normal range.

Someone told me it could be the alternator. Wondering if anyone else has had this issue and if it might be the tach or something else.

Engine is 2 stroke Yamaha 200 hp OX66.

Mentioned to local dealership and he hadn't heard of this happening.
Old 04-09-2007, 05:44 PM
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Default RE: Tach acting weird

rdsrb5 - 4/9/2007 3:52 PM

Went out 2 weekends ago, first time this year and noticed the tach bouncing around some. Motor ran fine and sounded fine, for example at 35 knots tach normally around 4500 rpm and it was spiking over 6,000, but at idle it was in the normal range.

Someone told me it could be the alternator. Wondering if anyone else has had this issue and if it might be the tach or something else.

Engine is 2 stroke Yamaha 200 hp OX66.

Mentioned to local dealership and he hadn't heard of this happening.
Mentioning it to the tach manufacturer might be more productive. With mine, I just tap the glass and it settles in to the correct reading. I'll get it fixed one of these days. It's supposed to have a lifetime warranty.
Old 04-09-2007, 05:45 PM
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Default Re: Tach acting weird

Here is the Faria Tachometer troubleshooting tips
http://www.faria-instruments.com/sit.../IS0100d_9.pdf
Old 04-09-2007, 07:25 PM
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Default Re: Tach acting weird

Can be as simple as moisture. Gain access to the back of the tach. There should be a dial there. Make a mental note as to which number it is set at. Then turn the dial back & forth a few times then back to the original setting. This should clear it up.

This clears the same nutty readings that I get from time to time..
Old 04-10-2007, 09:39 AM
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Default Re: Tach acting weird

Thanks,
Seem like some logical things to try.
Old 04-10-2007, 12:22 PM
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Default Re: Tach acting weird

NIGHTIDES - 4/9/2007 7:25 PM

Can be as simple as moisture. Gain access to the back of the tach. There should be a dial there. Make a mental note as to which number it is set at. Then turn the dial back & forth a few times then back to the original setting. This should clear it up.

This clears the same nutty readings that I get from time to time..
You beat me to this suggestion. I have personally had a tach act up like described and this fixed it!

Ken

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