Tachometer: Testing and Inspection

Tachometer Inspection:

Connect engine tachometer and compare the engine tachometer and tachometer readings. Replace tachometer if difference is excessive.
Standard value:
Type 1 (8,000 rpm indication)
700 rpm +/- 100rpm
3,000 rpm +/- 150 rpm
5,000 rpm +/- 250rpm

Type 2 (9,000 rpm indication)
700 rpm +/- 100 rpm
3,000 rpm +225/-100 rpm
5,000 rpm +325/-100 rpm

CAUTION:
As the tachometer is negative grounded, do not connect battery conversely to prevent dragging transistor and diode.

Connect the engine tachometer.
Insert paper clip into the engine revolution speed detection terminal provided in the engine compartment, and connect the engine tachometer to the inserted paper clip.
NOTE:
1. For tachometer inspection, use of a fluxmeter-type engine tachometer is recommended. (Because a fluxmeter only needs to be clipped to the high tension cable.)

2. For rpm, one-half of the actual engine rpm is indicated, so the actual engine rpm is two times the indicated value shown by the tachometer.