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I just purchased a cheap Chinese tachometer on ebay, it is an analog style gauge but is wired up electrically, I was wondering how to wire it up properly, I would assume that it would go to either the coil or the points, The instructions that I received were all in Chinese, so they are not a lot of help to me I have narrowed down the wires to what I believe are the positive negative and what I believe is a common with my trusty volt meter.
Depending upon your bike, it can sometimes be tapped into the ignitor too. Does it show a picture of anything resembling winding a wire around the spark plug wire? Any pictures at all?
don't think so I will have to check the schismatic, I did replace the coils about a month ago, and it goes from points, to the coil to a capacitor then ground and then spark plug lead come from the coil. It is a KZ 250 and I see that you have a KZ 500 reference in your signature.
Yup, I've been working on this damn 550 forever, never come up with the funds to throw at it until this year. What year is your 250? and do you have a link to the tach you bought? So I can see what you are dealing with?
this is the tach
http://www.ebay.com/itm/Motorcycle-Inductance-Analog-Tach-Tachometer-13000RPM-/110695906806?pt=UK_Motorcycle_Parts&hash=item19c5fd7df6
I did this on gretta. The pickup wire on the tach is going to connect to the two trigger wires on the coil (blue/yellow on a Honda). You have to run a pulse sensor wire for each coil, otherwise it is only going to register 1/2 of the actual rpm's. In order to do this you have to install a 100k resistor in line of each wire coming from each coil to prevent the pulse from coming back through the wire and triggering the wrong coil. Here's a diagram.
Kanticoy's wiring looks good, but remember that it's designed to work with ignitions that spark once per revolution with a tacho that needs two sparks per revolution.
Typical single cylinder tachos and those for 4's are one spark per revolution. Many good aftermarket tachos are selectable for 1/2, 1 or 2 sparks per revolution.
If I'm not sure what the tacho is designed for, I typically hook it up temporarily to a bike with a tacho and hold teh revs at say 4000 for a second or two. If they both read more or less the same, I'm good to go. If the new one reads 2000, I know it needs a Kanticoy type twin diode set up to double the pulses.
I found that a huge Polaris snowmobile 6 pulse tacho works fine on my bike connected to the alternator output !
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