Installing Yamaha speedometer

[jasell]

I just installed my new digital speedometer to my Yamaha 90 hp 2-stroke.<br />All electric functions worksfine but I don't pick up any speed.<br />When I blow in the hose to the speedometer I get readings.<br />When I blow in the hose that goes to the gear house nothing happens, I can not press any air thru. I also tried a pump and applied 5-6 bar, no air vent thru.<br />I checked the gear hose for a pito (?) tube but couldn't fined any, were exactly shoudl I look, and for what size?<br /><br />This is a new installation and the instructions only describes how to open the hose-nippel.<br />IS there any additional things that need to be done for a new installtion? like drilling a hole?

 

[Ray Neudecker]

Re: Installing Yamaha speedometer

There should be a small pitot in the front edge of the gearcase. Most likely clogged up. A very small drill bit and a lot of patience will most of the time clear it out. Use a small hand operated drill. Do not break the bit in it trying to use an electric drill. Good Luck.

 

[jasell]

Re: Installing Yamaha speedometer

OK, I will try.<br />The thing is that the boat is in the water and we only got 12°C in the water.<br />Any idea how to do this with out getting the boat out of the water?<br />What drill size should I use (mm)?<br /><br />TIA<br /><br />Jakob