EIS engine tach having problems

by James OKane in 2 Stroke Technical Questions 13 years ago

I have a 582 blue head (12 hours) and the engine tach on my EIS will fail during flight ever though the engine is running. I can reset the display and it will read correctly. Also when I turn off one of my ignition switches the tach goes to zero and if I advance the throttle it will show half of what the engine actually is running. The other switch when I close it acts correctly. I contacted EIS, they sent me a new display to try and the same thing happened. Any clue where to look next?

K. O

Re: EIS engine tach having problems

by bill martin » 13 years ago

bill martin

10 757 0

James,

Since you have eliminated the EIS, I would suspect a wiring problem. Maybe a bad connection momentarily somewhere. As for the zero reading when shutting down one ignition, welcome to Rotax two cycle. Almost everyone has suffered through the zero tach syndrome when doing a mag check. Doesn't do it every time and with some engines, never. When this happens to me, I just listen for the RPM drop and ignore the tach.

Bill.

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