Tach/ Dwell Meter By wildman (Read 3,747 times)

[wildman]

Here's a question for you electrical savy folks... Is it possible & if so how might i go about hooking up an automotive Tach & Dwell Meter to a scooter or motorcycle for use of the Tach function just for mechanical purposes??? The bike doesn't have a tach & I don't want to put one on it ether, but I need to see what it is idling at, also need to set the rpm for timing & timing advance diagnostic purposes... I have a Tach/ Dwell Meter for 4,6, & 8 cylider engines w/ 2 leads connection... Hooks to coil ground (points system) or tach terminal (CDI system) & chassis ground... Can the mathematical formula used w/ meter reading be changed to calculate the rpm for a 2 cylinder engine instead of 4,6, or 8 cylinders...

David Sr.

[Alleyoop]

Wildman,
I did find this:
Alleyoop

if the outboard has one coil and set of ignition points, then for a 2-cylinder 2-stoke you would multiply the 8-cylinder rpm reading by two

So, with the tach/dwell on one set of points, multiply the 8-cyl rpm by four. Each 2-stroke cylinder has one "ignition event" per revolution; an old-time 4-stroke V-8 would have four events per revolution.