I am glad you chimed in first, Jeff, Great pointers - I was (wrongly) going to suggest he check his alternator, as that is where my Kubota got its tachometer info from. Just read my Yanmar Manual, which does in fact show a sensor on the Flywheel. This helps me too, as now I can install my new Balmar that I have been sitting on B/C I didn't know how to re-adjust my tach, but now I see I don't need to. This list is a great inspiration. Thanks.
Also in the manual, just found that there is a engine stop lever just below the throttle, that I *could* have used when winterizing the engine the other day. Bill Coleman Entrada, Erie, PA From: Jeff Nelson [mailto:jhnelso...@gmail.com] Sent: Thursday, October 22, 2020 7:58 AM To: cnc-list@cnc-list.com Subject: Stus-List Re: Strange tachometer reading Here are some thoughts: When the tachometer (Ign. Sw.) is first turned on, pointer must go to between zero to 50 RPM <https://www.cruisersforum.com/forums/tags/rpm.html> . If not, check connections (if OK, tachometer is probably faulty). Voltages, with engine running should be: IGN to GND terminal: 12-16 VDC SEND to GND terminal: 0.3 VAC to 1.2 VAC minimum at idle; (voltage will increase with engine speed) The end of the (magnetic pick-up) sender must be within 1/32" -1/16" of the (flywheel) gear <https://www.cruisersforum.com/forums/tags/gear.html> teeth, but not touching the teeth. To adjust, stop engine, loosen the lock nut, and gently turn the sender clockwise until it touches the flywheel. Back off (counterclockwise) one turn, and secure with the locknut. Rust buildup between the flywheel teeth can cause signal loss from the sender. I've also heard of voltage regulators causing some variance. At least a few things to try. On 2020-10-22 8:47 a.m., David Knecht wrote: I took the boat out yesterday and at ome point turned on the engine when the wind died and I needed to manuever. When I glanced down at the tachometer, it read 4000 rpm. However, from the throttle setting, the engine sound and the boat speed, it was more like 2000 rpm. I had run the engine before and all was fine. I ran it later and all was fine. What might cause a temporary abberant tach reading? Thanks- Dave David Knecht
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