| Author | Message | ||
     Reducati |
my recently aquired s2, with dyno ignition, thunderstorm heads nhrs 1250 kit. just poking around and i see this wire, but it doesnt look like there is a mate to attach...my tachometer doesnt register, just jumps around...could this wire have something to do with it? its a green wire, coming from the front fairing..  | ||
| 01x1buell |
kind of hard to see, where does it come from. | ||
| Beardo |
Green wire is for the tach on Harley's. I do not know for certain about Buells. | ||
| Harleyelf |
Usually pink on later Buells. It was pink on my original module and on the '98 M2 module I used for my carburetor conversion. You might try touching it to the signal side terminal of your coil while the engine is running to see if your tach starts working. | ||
| Reducati |
thanks, the pink is the color for the tach, however, i was looking at the dyno 2000 instructions, and there is a green wire for the tach...ill give it a whirl tomorrow | ||
| Pash |
Is it for a twin fire coil primary? Dyna gives you the option of twin or single fire ignition. | ||
| Harleyelf |
Maybe it should go to the tachometer signal terminal. I'm concerned that it jumps; that indicates a wire flopping around, occasionally shorting to ground. Position would infer that it should be on a signal wire of the coil. Try turning the motor over slowly and putting a voltmeter on the mystery wire. Raise the rear wheel, pull the plugs, put it in high gear, and turn the wheel with the key on. If you get no voltage spikes, go to the ohmmeter scale and see if you get spikes of short-to-ground. | ||
| Reducati |
it has the stock coil, (dual fire?), harley ill give your suggestion a try. im not mechanically or electrically talented, so i will bring it to a friend who has the voltmeter. When the bike is running, it shows an idle of 4000 rmp ( though its really idiling normaly). when i ride it its showing 7000 to 8000 rpm, just jumping around wildly (engine is running fine) | ||
| Ratbuell |
If it's a single-fire ignition, the coil is firing twice as many times from the tach's perspective. The factory coil fires every time the crank is at TDC, to both cylinders. A singlefire coil fires only to the cylinder that is at TDC on the compression stroke - giving full output to that cylinder, instead of splitting the full output between the cylinder that is ready to fire, and the one that just finished its exhaust stroke and isn't firing. It sounds to me like the PO installed the singlefire ignition, but never changed the tach feed. If you have the model number for the ignition, google yourself some install instructions... | ||
| Harleyelf |
A dual fire coil will have only one signal wire and one power wire. A single fire coil will have separate signal wires for each cylinder. Your electrically inclined friend should trace the signal wire from your tach to see if it is coming from your Dyna or your coil. Be sure to show him the instructions that came with the unit. Perhaps it is set to single fire and running a dual fire coil with one signal wire left hanging. You are getting more than one tachometer signal per revolution. I have the original coil from when my S3 had fuel injection. PM me if you want it. (Message edited by harleyelf on April 14, 2013) |
