'94 EX500 Tach pulses from IGC - Ex-500.com - The home of the Kawasaki EX500 / Ninja 500R
 
LinkBack Thread Tools
post #1 of 6 (permalink) Old 11-9-2019, 10:14 PM Thread Starter
Junior Member
 
Join Date: Oct 2019
Posts: 1
 
'94 EX500 Tach pulses from IGC

I'm trying to wire up a new digital gauge and can't figure out the settings -- Does anyone know how many pulses per revolution the engine signals through the OEM wiring harness?
CTG805 is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 11-9-2019, 10:22 PM
Senior Member
 
Join Date: Oct 2017
Location: S.F. Bay Area
Posts: 326
 
Doesn't matter. Easy to figure out by just entering different numbers into tach.Too low and tach reads high. Too many and tach reads low.

Problem you're having is you're connecting wrong wire. Tach & coil signal is NOT +12v pulse like lots of people think. It's grounding pulse. Coils are powered on full-time so you'll measure +12v on both coil terminals. Then igniter momentarily grounds coil to fire plug. So you need to wire up tach for negative grounding signal. Oscilloscope is handy for cases like this.

DannoXYZ is offline  
post #3 of 6 (permalink) Old 11-11-2019, 10:52 AM
Senior Member
 
Kevinl7778's Avatar
 
Join Date: Mar 2018
Location: Hamilton, NJ
Posts: 447
 
Garage
I just did this on my 600 this weekend for a simalure reason, thats a nice tight pulse right there!

1993 Teal/White EX500 6K First Street Bike
Kevinl7778 is offline  
 
post #4 of 6 (permalink) Old 11-11-2019, 11:49 AM
Senior Member
 
Join Date: Nov 2006
Posts: 1,065
 
One pulse per crankshaft revolution.
Put a 10k resistor in the line to condition the signal.
bitzz is offline  
post #5 of 6 (permalink) Old 11-11-2019, 11:52 PM
Senior Member
 
Join Date: Oct 2017
Location: S.F. Bay Area
Posts: 326
 
Quote:
Originally Posted by bitzz View Post
One pulse per crankshaft revolution.
Put a 10k resistor in the line to condition the signal.
It's actually two per revolution since there's no cam-sensor to determine sequence. End up with wasted-spark arrangement where each cylinder also fires on TDC of exhaust-stroke as well. And its not tap off +12v side of coil or high-voltage secondary. Ground is ground, no conditioning needed as nothing will change.

Last edited by DannoXYZ; 11-11-2019 at 11:55 PM.
DannoXYZ is offline  
post #6 of 6 (permalink) Old 11-11-2019, 11:56 PM
Senior Member
 
Join Date: Oct 2017
Location: S.F. Bay Area
Posts: 326
 
Quote:
Originally Posted by Kevinl7778 View Post
I just did this on my 600 this weekend for a simalure reason, thats a nice tight pulse right there!
Yep! That's digital-electronics for ya!
DannoXYZ is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ex-500.com - The home of the Kawasaki EX500 / Ninja 500R forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome