The Speedo on my Suzuki DF140 outboard quit working. The tubing
between the engine and gauge is clear and I can make the needle move
by pressurizing it with air from the motor end. If I try to blow air
toward the engine it appears to be totaly blocked. I'm wondering if
there is a check valve. Can't find anything clogging the pickup hole
on the lower unit, but it could further up. Any ideas on how to fix
this?