Erractic rev counter and misfire

[z1bman]

what voltage do you have between the brown + the black wires that are connected to the tacho?

[Robw]

Hi, into the clocks I get 12.2v and across wires I get 8.2 v .
I also checked the coils ( in series as I have an 8 plug head) 11.9v into coils ans 7.8 v going into second coil, borh sides similar. The loom that joins the pair of coils gets very hot as well
Rob

[Al]

Sounds like the coils could be wired up differently!
As an aside; do you have one coil per cylinder WRT to HT leads or have you split the twin outlets between pairs of cylinders?
Battery voltage seems a little low but the fact that the alternator puts out +14 volts suggests that the rotor / stator combo and the regulator / rectifier are both intact.

AL (dangerous with a multimeter)

[z1bman]

according to the kawasaki test you should only have between 2-4 volts between the brown + black with the engine running? meter + lead to brown meter - to the black you should have battery voltage at the coils. have you tried connecting the + side of the coils direct to the battery

[Robw]

Hi Al, the coils wired up according to the Dynatek wireing diagram for 4 coils, in fact it has an extra 12v lead going to it because of the Dyna ignition. The coils go to different cylinders, the same as standard coils.
When I checked the voltage to the clock, I remember one reading being lower than the rest but I did nt record it.
I will buy a new battery Motoblat seems favourite at the moment and try all the tests again
Rob

[Taffus]

Hi rob
here is the wiring diagram Dyna sent to me for my 8 spark head

[Robw]

That's what my wiring diagram looks like without the Dyna 2000 box.
The Dyna s has four wires the two red ones go into the loom and the green and black(I think) go to the coils. I then have a switched 12v from the connection near the battery and two of the original coil wires going to the coils. The pairs of coils are then linked together with a loom.
The fault I have did become more noticable at Donnington, but it could have been showing similar symptoms before, although I put that down to stroppy carbs. Which could indicate a duff coil or the battery voltage becoming too low, Al worked out that the battery wasnt charging too well, so I have replaced the Stator and that side of things look okay now.
I have ordered a new battery as 11.8v at rest doesnt seem enough especiall when my GPZ is well into the 12v at rest.
I will check everything again when I get the new battery
Cheers Rob

[FER]

Check the fuses
.fer