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Author Topic:   Yamaha Speedometer / Oil gauge
skred posted 07-29-2002 08:38 AM ET (US)   Profile for skred   Send Email to skred  
Since I carry a handheld GPS, I never really noticed my OEM speedometer doesn't register at all. (70 Yam and instruments) I disconnected the tube at a connection joint and blew thru it to the stern, and it's clear. Blowing the other way (6 in. of tube) registers nothing on the dial. Is it dead?
On a related item: the oil gauge on the same dash panel shows yellow & red lights, but not green - although the oil reservoir is completely full. Anyone experienced this?
jimh posted 07-29-2002 09:49 AM ET (US)     Profile for jimh  Send Email to jimh     
On my Yamaha gauge the oil indicator is part of the tachometer, not the speedometer, and it indicates the level with a small black triangle, not by illuminating those red/yellow/green regions.
skred posted 07-29-2002 11:20 AM ET (US)     Profile for skred  Send Email to skred     
Hmmm.... I didn't notice if there's something on the tach. If so, I've got to figure out what the small gauge below the tach is for... My gauge setup has speed and tach (large) and trim and (oil?) [small}...
where2 posted 07-29-2002 01:10 PM ET (US)     Profile for where2  Send Email to where2     
I know for a fact that some of the techs at Yamaha are really good about helping customers figure out why things aren't quite right. My dad picked up a Yamaha fuel flow meter from a local parts house, then got the wiring harness and flow meter from the Yamaha dealer, and got all the wiring sorted out with the help of the yamaha tech support guys.

The other question I have is what did you blow through the tube with? If you're blowing with your mouth, it's hard to register much over 4 or 5mph. If you used a compressor, how much PSI did you have it set for? Somewhere around 10PSI should give you a reasonable reading.

skred posted 07-29-2002 03:56 PM ET (US)     Profile for skred  Send Email to skred     
Actually, there was about 12 inches of hose to the gauge, then a splice to the rear. Years back, I had tested a teleflex speedo I had on a 13 BW by blowing in the tube at the stern, and registered about 20mph, and at speed, it registered correctly. Does that imply I'm a windbag, or just have strong lungs...? When it's all connected and the sensor at the stern is clear of obstructions, it still doesn't register at close to 40 mph. Also, on a Merc 75 I had installed on an earlier boat, there was a tube right from the lower unit on the engine that you spliced to your speedometer tube. My Yamaha has the same tube, but it's unused. I checked it and it's clear of obstructions, so I'm gonna use that instead of the "hang-off-the-back" sensor.
May have to remove the speedo to rehab it, but I have to pull the steering on the 15 CC to get at the mounting... Talk about a mess...
SSCH posted 07-29-2002 07:48 PM ET (US)     Profile for SSCH  Send Email to SSCH     
Skred

We should have asked if you're using the digital or analog Yamaha gauges. If digital, I agree with Jimh, the oil gauge is a part of the tach. The red and yellow areas of the tach face show color, but the arrow above the colors is what matters. The green color is most pale. Could the other small gauge be water pressure?

By the way, my 15 Alert is finally here and construction of the interior is under way (slowly) in my garage.

skred posted 07-30-2002 08:22 AM ET (US)     Profile for skred  Send Email to skred     
SSCH,
The gauges are analog, and the tach and speed have no other displays in them. The two small gauges below them are trim and oil (I think} Haven't looked real closely yet, but was told that by the seller.
I'm envious of your new project. Not to sound like granny, but taking time with each step pays off big time in the finished product. You gonna post progress pictures?
SSCH posted 07-30-2002 08:39 PM ET (US)     Profile for SSCH  Send Email to SSCH     
Skred

I will take a lot more time than I had planned, like it or not, due to other commitments. Your Granny is right, however. I do find that time between cuts results in much less wasted lumber. I have promised (and continue to do so) to post picures of both the 25 Guardian and the 15 Alert.

The analog gauges look good to me. I have planned to use the digital just because there are less holes required. I believe there is an analog tach with an oil level indicator built into it that I may have to reconsider.

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