basic tacho question

sandino · Scooby Slapper Joined: 30 Jan 2007 Karma :

Small tacho problem brings up some questions.

Are all tachos the same? As in, my current unit has a 12,000RPM redline, if i got a different tacho with a 12,000RPM redline would it work? I am sort of under the impression that in determining the ratios etc. the important part is the cable, which i have.

To put it in perspective, i have a little YBR125. The original tachos are more than i want to pay really, but i can get one off an SR125 or maybe a TZR125 from ebay for alot cheaper, just solder the relevant wires or something. Will this work?
____________________
YBR125 - My bike's current land speed record - 74MPH (indicated)

Blau Zedong · Banned Joined: 26 Jun 2006 Karma :

NSR Mick · World Chat Champion Joined: 26 Jun 2005 Karma :

If the input signals are the same yes. If you dont understand that get the one for the bike.
____________________
If you dont like the way that I ride.......Stop trying to keep up!!!

finpos · World Chat Champion Joined: 13 Sep 2005 Karma :

Most Mechanical tachs have the same ratio as long as you stick to the same manufacturer, but it's no guarantee.

If it's an electrical tach, you should get away with using one from a bike with the same ignition pattern, so you should be fairly successful on a transferring between single cylinder bikes. Again, though, no guarantee.

f.

sandino · Scooby Slapper Joined: 30 Jan 2007 Karma :

iooi · Super Spammer Joined: 14 Jan 2007 Karma :

Could be that the cheaper ones are cable driven (rotating wire) and not fed by eletric impulse's.
____________________
Just because my bike was A DIVVY, does not mean i am......

finpos · World Chat Champion Joined: 13 Sep 2005 Karma :

...it's an electrical one, then. What's inside is basically a frequency to voltage converter with a big analogue voltmeter stuck to the front.

You should have a good chance of it working if you can figure out the connections, which will most likely be 12v, earth, signal from ecu, illumination.

f.