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Post by tsimi on Oct 31, 2014 8:03:26 GMT -5
I received my Tachometer today. Yeah! Price was 4200Yen (~$40)     Now I was wondering if it would be possible to pull the + and - and ignition connection from the stock speed meter? (2003 Jog CV50R) There are 8 wires underneath it (green or grey,brown,yellow,red,white,green,black,white) I guess black is - and red is + but which one is the ignition?  There is also a long white cable which is for the signal. That wire I have to connect to the ignition coil right? Or can I just wrap it around the spark plug cable, like they do with the trailtech tachometer. There is this topic 49ccscoot.proboards.com/thread/1697/koso-tach-cylinder-gauge-install but the wiring and approach looks a bit different there. |
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Post by Clank on Oct 31, 2014 8:10:11 GMT -5
Wow! Your hand is running at 5K.
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Post by tsimi on Oct 31, 2014 8:12:52 GMT -5
Wow! Your hand is running at 5K. lol yeah, my brain waves are transmitting a signal to the tacho.  |
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Post by 90GTVert on Oct 31, 2014 9:04:44 GMT -5
What do you mean by ignition when you are looking at the blackand red + and - wires? Does it require a 12V+ constant connection and then and ignition switched 12V+ source or is it for illumination or what? It looks like the tach has red, black, and orange. When I see orange in auto-wiring I think illumination so I'm guessing it's either for dimming the tach when headlights are on or making lights come on with the headlights. Most scooters don't have any sort of illumination change if the headlights are on all the time. Others have a headlight switch and the gauges would light up when the headlight switch is on. Depends what you have and what that wire is to how you need to approach it. Most likely red to the gauges will be an ignition switched power wire (only on when the key is on). Black or green could be ground. You can find this stuff out easily with a multimeter or test light. If you don't have a test light you can make your own from some small 12V accessory like a turn signal bulb with wire attached to probe with or anything that will have a visual or audible cue that you are getting power when connected properly. You could even use the tach with temp wires twisted onto the harness to see if it powers up and lights up and so on, but I suppose it's better to risk a cheap little bulb than the tach should anything be wrong.
For the tach signal, I would check the instructions or try it before it's all installed and more permanently connected. You can try wrapping the wire around the plug wire a few times and see if it does anything. If not you'll have to tap into the + side of the coil's wiring. It's easy enough to do either way.
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Post by tsimi on Oct 31, 2014 9:50:20 GMT -5
Yeah there is a black,red,orange and two white wires. The orange can be ignored. As you said it's responsible for the illumination. Red is + and black is - and the shorter white wire goes to the ignition the wire that is only running when key is turned.
The other longer wire goes to the coil i guess.
I just thought the speed meter works the same way and it would be more near then the battery. Turning the key makes the needle spin once and go back to 0 same as the tacho should do once correctly wired.
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Post by 90GTVert on Oct 31, 2014 10:41:12 GMT -5
Some gauges use a separate power source that's constant for memory, some don't. Not sure if there's a standard on a scooter. Sometimes it seems like they use whatever they feel like. Could be red. Sometimes red is batt+ and sometimes it's switched +. Hard to know without a diagram or a test meter/light of some sort.
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Post by tsimi on Oct 31, 2014 10:52:49 GMT -5
well i guess it's time to dig out the old meter of mine. I hope I can remember how to use it.  |
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Post by 90GTVert on Oct 31, 2014 11:20:16 GMT -5
It's really easy to check for what you're looking for here. Set the meter to check for DC volts. Put the black probe on a good secure ground. Use the red probe to find which of the wires on the scoot gives you 12V+ with the key off (if any) and which give you 12V+ that switches on and off when you turn the key on and off. When you've found those, you can hook the red probe to one of them or to batt+ and use the other probe to make sure one of the wires is a good ground.
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Post by tsimi on Nov 2, 2014 2:12:51 GMT -5
I decided to take the red +, black - and ignition wire from the starter (the thing where you stick in the key and turn). There were 3 wires +, - and ignition, simple enough right. Place (red circle) where i connected the Tacho meter.  drilled 5 holes for the holder, the bolts could have been a tiny bit shorter. (rear view)  finished holder (front view)  tighten everything with strip locks and cleaned up the wiring.  here is the result after installation and wiring I could have just tighten the signal wire around the spark plug wire though but I decided to connect the signal wire directly to the ignition coil.(sorry got no pics) So far no problems. There is now one last thing. There is a switch behind the Tacho where i can set the engine type. Here is what is written in the manual and I quote 1. not important 2. Switch position 0=10 cylinders, 1=1 cylinders, 2=2 cylinders, 3=3 cylinders,........... 3. When setting the number of cylinders for a rotary engine set the cylinders number selection to 4 cylinders for 2 rotors, and 6 cylinders for 3 rotors. 4. not important i have set the dial to 2 and i get like 1500 rpms in idle mode. Is that more or less correct or too high? |
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Post by niz76 on Nov 2, 2014 2:26:39 GMT -5
Nice tach! Looks nice. Looks like it's working correctly to me...
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Post by 90GTVert on Nov 2, 2014 9:38:29 GMT -5
Looks right to me. RPM would be way off if it were wrong... like double or 1/2. 2Ts fire once every revolution so they would fire as much as a twin cylinder 4T... although actually the 4T scooters generally use a "wasted spark system" and fire once every revolution as well. I like the tach! Thanks for the pics and video.
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Post by Elektrey on Nov 2, 2014 13:06:52 GMT -5
Damn that looks nice. I've always thought about replacing my stock HUD with one of those $70 ones on ebay that has the built in tach/speed/trip/lights etc.
And man that sound is outrageous. I would have thought u started a muscle car if I didn't see the RPM moving.
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Post by jhobe6678 on Nov 2, 2014 14:57:33 GMT -5
It does sound nice, I'm kind of jealous.  I was looking at buying that exact same tach too! Mostly for my M1. If I could find a matching speedo in MPH I'd grab them for sure. I am more of a fan of analogue gauges over digital for some reason. Good job dude! |
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Post by tsimi on Nov 2, 2014 22:21:09 GMT -5
Thanks guys! Sound is not bad for a 50cc scoot. I'm very satisfied with my Exhaust and I don't know really why but since I changed my torque spring to the yellow one the sound changed to that what you hear in the video. Regarding the Gauge, at first I was looking for a white face, red LED model to match the stock speed meter but I couldn't find one so I just went with that model that amazon japan had in stock. There are various sizes and background + LED combinations. Just search for auto gauge and you should find the makers site. Mine has a peak alarm light which shines at 6000+rpm which is cool because if I'm not mistaken the 50cc Jog gets his full power at around 7000rpm. So as soon I can see the peak light I know that shortly after the full power capacity is reached. You guys should see the Tacho at night,...AWESOME! Analog style all the way..!  Thanks again to 90GTVert for his advice and help. This forum ROCKS! Now finally I can start with my CVT fine tuning. |
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Post by tsimi on Nov 3, 2014 11:02:18 GMT -5
I forgot to mention, i don't think that the tacho is water proof or rain proof that is why i mounted it on the inside. So bear that in mind when buying/using that tacho.
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