My 86 seems to have a tach problem. When the engine is running the tach bounces around or most of the time doesn't work at all. Any suggestions? Thanks
Does the bike run ok when the tacho is playing up (misfiring, running on one cylinder)?
If it does then you could well be having problems in the wiring from the ignitor to the coil, or the ignitor itself. The tacho gets the pulses that the ignitor sends to the front ignition coil (located on the left hand side under the tank). A wire then goes from the ignition coil to the tacho). Mine does it occasionally, but the bike runs fine, just got to find the time to pull apart all the connectors and clean then up. I use a Dremel with a fibre glass/plastic brush to get rid of the deposits on the male connector and then pull and push the connector on to clean the female. Squirt of contact cleaner and wrap up in rubber amalgamating tape.
If the bike runs fiine when the tacho is playing up, then it has to be in the wiring from the tacho to front ignition coil, the tacho or the power supply to the tacho.
One other little one is the tacho power comes through the ignition switch, so that could be another culprit. If you look at Page 15-42 of the Kawasaki manual there are three wires that go to the tacho unit:-
BR - Brown (+12v from the ignition switch)
BK/Y - Black/Yellow (Earth)
BK - Black from the Front Igniotion Coil
One of those should be the problem if the bikes running ok.
Hope this helps and good luck.