Posted by Jim Becker on September 06, 2012 at 07:52:36 from (173.74.120.222):
In Reply to: hour meter and tachometer posted by Ken Christopherson on September 04, 2012 at 17:03:58:
Quoting Removed, click Modern View to see
The hours reading is literally a revolution counter. Take the reading, multiply by the "at RPM" number, multiply that by 60 minutes per hour and you will have the engine revolutions that the meter has clocked.
A mechanical tachometer is exactly the same as a mechanical speedometer. The input shaft is coupled to the needle through a magnetic coupler, where speed is translated to a force. Here is a page that shows the insides of a speedometer. The bike speedo is somewhat different from most, in that the magnetic coupler is at an angle. Most tachs and speedos have the cable straight in line with the pivot axis of the needle.
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