On Mon, 18 Feb 2008 13:57:19 -0800 (PST), nfisherman
wrote:

On Feb 18, 3:45*pm, Short Wave Sportfishing
wrote:
On Mon, 18 Feb 2008 08:01:05 -0800 (PST), nfisherman

wrote:
My speedometer is not working. *I have narrowed the problem down to
the inlet for th pitot tube in the gear case. *I have removed the gear
case and when I put air pressure on the tube toward the dash, the
speedo needle moves. *I cannot blow air in the other direction into
the gear case. *It's plugged tight. *I can't see any clogged holes on
the exterior of the gear case. *Does anyone have any suggestions
before I give up and live with my GPS for speed?. *I know the GPS is
more accurate anyway, I just like to have all of the console gauges
working.

I've seen this before, but not on a Yamaha.

What's probably happened is the tube from the pitot intake is blocked
or pinched - more likely blocked by crap - salt, mud, sand, etc.

The best way to clear it is to use thin SS wire - like trolling wire -
or, the way I did it on an old Evinrude, SS welding wire - the
thinnest you can get which is pretty thin.

Either that or grab a air hose and use pressure to clear the line.

I think you're probably right, but I can't find the block. The
blockage is definitely in the gear case. I have removed the rubber
tube from its connection and I have poked a wire in there. It goes in
about 8 inches and stops. Next, I poked a wire in the hole on the
outside of the gear case, which I think is the one for the speedo. It
stops about one inch in and then when I push harder, it goes in for
about a foot. It feels like it makes a bend and then it's just open
space in there. After all that, I screwed the barb fitting back on,
connected a hose and blew in air. It's still blocked. I'm stumped.

Well, I'm out of ideas beyond it being pinched.

Sorry.