Tachometer Question
Road Master
Joined: Jan 2020
Posts: 856
Likes: 373
From: Duke City, NM
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Road Captain
Joined: Nov 2019
Posts: 716
Likes: 464
From: Queens, NY
Ok, Im used to inductive rpm and timing lights. This on is a bit different, there are settings depending on spark per revolution. It sounds like this one is set incorrectly. Take a look at the pdf @RIPSAW sent a link to. Idle should be around 9-1100. Get that right and it should be correct.
I remember using this Tiny Tach on my 03 Sportster just to check rpm. I believe I took the reading on the meter and doubled it for the rpm. Been a long time in the tool box
Seasoned HDF Member
Joined: May 2017
Posts: 5,915
Likes: 5,928
From: NorCal
@brakeless if they are a good quality they are very accurate. I used to use them tuning hot rods back in the day because they were more accurate than the analogs I ran. They have been used for timing for decades.
Seasoned HDF Member
Joined: May 2019
Posts: 5,817
Likes: 11,105
From: NE Ohio
don't know about lawn mowers, Brake
But I've used them on power equipment for years (Tiny-Tac brand specifically)
The only failures I can recall in 20+ years of using them is the hour meter stops working.
but the tac still reads
when you run the equipment daily, you can tell the RPM within a coupe hundred revs without tac
Tiny-Tac has always confirmed what I hear and has stayed consistent "forever"
just my experience
..L.T.A.
Club Member
Joined: Sep 2010
Posts: 15,420
Likes: 7,118
From: Beyond Fucital
As our Harleys have a wasted spark your "tach" is reading a spark that does nothing.
So it's reading twice as much as it should be.
So it's reading twice as much as it should be.
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Road Captain
Joined: Nov 2019
Posts: 716
Likes: 464
From: Queens, NY
Its been many years since I used Tiny Tach. I forgot that it reads half of the actual rpm. Set it at 500 and thats where it likes to be, 1000 rpm