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  #1 (permalink)  
Old 07-25-2005
bankerjohnfl
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I recently bought a "new" boat with a 115hp Yamaha, and digital gauges. The gauges were both bad (LCD unreadable), so I purchased and installed new gauges. Problem is, the speedometer only displays a single bar ... no speed readings. I believe my problem is that the 1/16" hole in the leading edge of the lower unit is clogged up. My question is ... how do I unclog it?

Here's what I've tried so far:

Cleaned out the hole with a 1/16" drill bit.
Disconnected the "water tube" at the top of the lower unit and tried (a) blowing thru the tube, and (b) connected a syringe filled with water and tried forcing water down from the top.

Neither attempt was successful.

So am I going to have to drop the lower unit and replace the water tube ... or does someone have another suggestion?
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  #2 (permalink)  
Old 07-25-2005
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easiest thing to do is to install a pitot tube as the yammie tubes get clogged much.
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  #3 (permalink)  
Old 07-26-2005
bankerjohnfl
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If I installed a pitot tube on the transom, would I have to run completely new tubing to the speedometer ... or could I tap into the existing tubing where there's already a connector above the lower unit of the motor?
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  #4 (permalink)  
Old 07-26-2005
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i prefer not to wrestle with clogged tubes so i use pitot tubes, others here would not and use the factory one on the motor, just way too inconsistent for me. you can splice into the tubing anywhere you like and its quite cheap at home depot, about 5 bucks a roll.
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  #5 (permalink)  
Old 07-30-2005
bankerjohnfl
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Come on guys ... surely someone has an idea of how to unclog the line without removing the lower unit!!!
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  #6 (permalink)  
Old 07-30-2005
CHRIS
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i just had the same problem on my 200yam. above the lower unit the tube should be sticking out with a connection . pull apart and blow through it or run water through it or shove a piece of music wire through it. also disconect from speed nometer and do the same while disconected at lower unit. takes about 15min.
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  #7 (permalink)  
Old 07-30-2005
Bluebird
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I would run a new hose from the pitot to the speedo. I did not and now its clog again probably at the joint.
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  #8 (permalink)  
Old 08-01-2005
brewski
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I ran a drill bit in the hole with a Makita battery operated drill, don't use electric, because water will come out when you get it open. Just make sure it is straight in and go slow.
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  #9 (permalink)  
Old 08-01-2005
mark115
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My speedomoter never worked but after reading this thread I thought I'd try to fix it. I tried unclogging the port I disconnected it from the lower unit but it was clear through there.....What's the problem??? Well let me tell you. I connected the tube from the gauge to the engine using the connector that was on the motor and that connector did not pass through! It was a plug I guess. Very frustrating in a way. It works now though so I'm over it.
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  #10 (permalink)  
Old 08-03-2005
plot4
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How about pulling the speeo tube apart where the connection is between the engine and speedo tube. When it comes from the factory there is a end on the connector that has to be cut off to open up the flow. If the previous owner didn't have a speedo then the tip probably was not cut off.
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