1KT Tacho Signal Voltage

[nick_b]

Hi,
Does anyone know what voltage I should be seeing from the CDI to the Tacho?
I stripped the bike down to the bare the frame to have a repair. I have just put it all back together and on start up to tacho is reading 5,000 rpm at tick-over.
I have checked the 12v at the supply side and the earth continuity check is good.
At tick-over there is 37 volts input from the CDI and at (approximately) 6,000 rpm there is 50 volts.
The tacho was working perfectly before this strip down.

Thanks,

Nick

[tzr-v4]

Hot wire for the tachometer comes from the CDI and signal is + or - 200V pulses.

I could look at my pictures to confirm but :
 - early TZR250 1KT 2MA (as RZ350 + 500) are the same let say +pulses
 - later TZR250 2XT, 3MA, TDR250 and R1Z are the same let say -pulses

You can not test with a multimeter.
You need an oscilloscope to look at it.