Firecracker . replied: "First, the needle doesn't kill the bike. It's just a meter that's supposed to show what the engine is doing, it doesn't control anything. It should drop down when the engine dies.
You don't say what bike, that's real important.
If it's an electronic tach, you probably have an electrical problem of some sort.
If it's mechanical, it's a bad cable or a stripped drive gear."
motorcycle tachometer (rpm's) bouncing everywhere? when i take a ride for a little, it starts to bounce around like crazy. also the engine gets strong and weak, strong and weak... head lights gets weak and comes back to normal.
whats the problem? do i have to change spark plugs? or is it a weak battery problem? or etc..
its a Kawasaki NInja 250r 2005
Mad Jack replied: "Sounds like a bad battery connection or a bad ground. Spark plugs would have nothing to do with the headlight getting dim then bright. A weak battery would be worse when you first start the bike, not after it has been running a while.
I ride a different make of bike, but it is notorious for a similar problem. I frequent a forum for my bike. The recommended repair is cheap and simple. They recommend using star washers on both sides of the battery connections. Use 2 washers on each connection, one on each side of the cable. About a 50 cent fix and a little time."
TXm42 replied: "Sounds like a voltage fluctuation to me.
Prime suspect for such a condition would a Faulty Voltage Regulator.
There's other things also,,,but they all rank pretty far down the "Top 10 List of possibilities"
Good chance the battery is Weak or damaged.
Normally a battery can absorb a substantial voltage swing,,,and sort of Buffer it due to the battery being steady output.
A bad Regulator can damage a battery,,,so that adds a bit of suspicion.
So,battery to be tested also.
Things like Bad Connections,,,corroded or loose wires can also cause symptoms like your bike's having.
But the place to Start Checking is the Regulator and Battery.
Then go from there.
Good Luck,,,"
how would you hook up a tachometer on a 50cc motorcycle? can anyone help??? its a RCM moped/motorcycle... its only considered a motorcycle because u have to shift.... please help!!!!
guardrailjim replied: "There shouldn't be a problem, but call first to make sure."
Connect honda Tachometer to a Kawasaki motorcycle engine? I have a tachometer from a 1983 honda 750 shadow motorcycle. I have tried connecting it to a 2006 Kawasaki Vulcan 900 motorcycle engine. The problem is that although both engines are 4 cycle/stroke the honda uses a dual fire ignition system ( spark plug fires on both compression/power stroke and exhaust stroke. The Kawasaki is designed to fire on the power stroke only. No surprise that when connected to the negative side of the kawasaki coil the Honda tach. registered only 1/2 the actual RPM's. I went online and found a electrical diagram designed to correct this, it didn't work. The diagram showed a wire coming from the negative side of each Kawasaki coil. Each wire passing through a 1N4007 diode (Radio Shack) and, also, a 100K Ohm resistor then connecting together and continuing to the tachometer. Tachometer will not work at all with the described wiring adaptor connected to both coils, disconnect from one of the coils and again I get a reading but only 1/2 of actual rpm, Any suggestions as how to fix my peoblem? Thanks.
bikinkawboy replied: "I'm no electronics genius, but I wonder what the resistor is for? Unless Honda uses a resistor in conjunction with their tach. I know Kaws but can't say for sure on "newer" Hondas.
I can see the diodes to keep both coils from firing at the same time and before I read your complete post I was thinking along the same lines as what you described. Right now I'm stumped, maybe there's a Honda expert out there that knows Honda tachs."

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