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Just a thought, did you ever use a regulated steady stream of compressed air to spin the paddle wheel to see if it spins up without chattering? And see what the speedo reads testing it that way. One of the paddle wheels on a sensor I was messing with wobbled and chattered so bad that I couldn't...

Sounds like you had a very interesting career, I would have loved to do something like that. As far as your speedo problem, it sounds like you are on the right track. I would check every connection and then probably move on to the speedo itself. Let us know what you find, I am curious now.

I have not had either one on the water yet, hopefully in the next couple of weeks. Then I guess I will see if the fix worked for me.

Hey, I would take any of the sensors and parts if you are just going to get rid of them.

I am curious why a lean condition in an oil injected 2 stoke causes a cylinder failure. Is it because the fuel is needed to pick up the oil and distribute it through out the cylinder? Thanks Scott.

I wouldn't think the magnets would fail, but I have seen weirder things in life. That is odd that your sensor is not operating the speedo since the voltage readings looked good. I am beginning to think you understand this way more than I do. lol

Sounds good. I hope it works for you. I revised the drawing for bench testing the speedometer. I did it this way again tonight and was able to run the speedometer up all the way with compressed air.

Ok, so I tried bench testing a speedometer with the 1K resistor in the circuit and it did not move. So I took the resistor out and the speedometer needle moved. I also checked the voltage of the PU wire feeding the speedometer on the ski and it was 11.5V. So using 12V to the speedometer PU wire...

Sorry, my wife had other plans for me today. It will be tomorrow night before I can get to it.

Let me do some experimenting later today and I will get back to you. I do not want to tell you to do something that burns up your speedo.

When I bench tested the speedometer I did not use the 1K resister from the 12V power supply to the PU wire of the speedometer like I illustrated above. I drew the resister in just to be on the safe side, try it without the resistor. When I did this I did it quickly, just to verify I could get...

What you could do is put it back in the ski and use compressed air to test it. Just regulate the air and see if you can get your speedo to run up all the way.

Hey Brian, looks great! Your readings look good to me, have you tried it on the ski yet to see if the speedo works? Also, if the inserts break I have seen guys just use bolts with washers and nuts to bolt the pickup back on. It is almost impossible not to break a couple when removing them.

I have worked with nimrods before and that would be myself. The only reason I brought it up was because I ordered the wrong SS41 the first I did it and it did not work. I know the components I have listed work, so if you get the exact same ones they will work for you.

That is the exact SS41 I used, just make sure the diode has the same specs as the one I have listed.

I just looked and the SS41 was $4.32, did you order the correct one? You need part # 785-SS41.

Here is a wire diagram of how you would bench test the speedometer with a working PU sensor.

Let me know how it goes!

Hi Brian, yes I would say the SS41 is going bad. Had the same symptoms on 96 GTX we just got this fall. Speedometer would only go a little over 10 mph when we used compressed air on the sensor. Switched the sensor out with one I had fixed and the speedometer would run all the way up with the...

Give me a couple of days now to get you that. I need to verify the voltage to the speedometer itself.