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Old 02-09-2020, 01:17 PM
Jonathan Alvord Jonathan Alvord is offline
Join Date: Feb 2018
Location: Prosser, WA
Posts: 96
Default Erratic RPM sensor - Saga continues could it be the Lightspeed

Ok am so perplexed by this. I believe my RPM sensor is built into the Plasma II+ CDI with Direct Crank Sensor. Would that be correct. I haven't not been able to trace a RPM sensor anywhere else. I am running a Slick Mag and the Light speed. for the 4-500 hours my RPM gauge was spot on, now it has been slowly becoming more erratic, now bouncing between 0-3000 (it is def just just sensor/monitor, and not prop). It is wired through my GRT 4000 and and the GRT Horizon WS screens with the first problems showing at the GRT 4000. I have cleaned all the spark plug wires and thought that might have fixed it but to no avail. Now I am thinking it may be the Direct Crank sensor and a bad electrical lead (however the engine is running great and mag checks are normal).

What am I missing? Sometimes I hate electronics.

S40 Prosser Washington
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