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Electrical - Tachometer Adapter

This version was saved 15 years, 10 months ago View current version     Page history
Saved by PBworks
on July 2, 2008 at 5:20:45 pm
 

 

The VStar 1300 has what is called a single-fire ignition. That means that only one coil (a single coil) fires on each compression stroke. If you connect many different brands of tachometer to either coil, the tach will read half of the actual RPM.

 

A double-fire or dual-fire ignition, like many of the older bikes that do not have an ECM (computer) fire both coils on each compression stroke. That means a tach connected to either coil on those bikes will read the true RPM.

 

Of course you would not want to connect the two coils together since it might destroy the ECM. So, what do you do?

 

You can buy tach adapters from several sources for about $30 to $100, or you could make your own for less than $5.

Here's how.

 

TachAdapter.pdf

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