Are Yammie tachs accurate?

M

Mick Max

New member
Joined
Feb 18, 2004
Messages
5
My Aaen pipes on my 600 tripple should have max power
at 8800-9000 rpm. But the sled feels far stronger at 9200.
Ny friend says he is not surprised because every tach he has seen is
optimistic.

Is that true?
Who calibrates yammie tachs?
Thanks
 

I think they are all off somewhat< i tested three with a photo tach hooked up to read rpm's at the clutch, they were over 100@4000 other was over 200@4000 and mine was under 150@4000 rpm. I tested three polaris ones and they were similar but one was perfectly on the money. I too wish I could get mine calibrated somewhere, I asked this question before, people only said buy an aftermarket tach, but I want to keep my guages looking the same, if I could buy a tach and speedo combo that fits the stock pod I would do so , anyone have any ideas?
 
I just went and tested mine with my Mac Tools digital multimeter and at

4000rpm on the tac, the multimeter showed 3950rpm
6000rpm on the tac, the multimeter showed 6000rpm
8500rpm on the tac, the multimeter showed 8500rpm

Looks like I've got a good one.
 
I got a new Digatron gauge w/all the bells and whistles, and when downloading all the info on the computer, it shows the rpms, etc, and when my tach showed the peak at 8,900rpms, the recall on the gauge said it hit 8,850. At those speeds, 8,900 and 8,850 sort of look the same. I think on the top end, the tach ran pretty true. Never really investigated the lower rpms, but probably not too far off.
 
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