Engine testing Yamaha 50hp 4 stroke
Hi all... so I constructed a test stand for my Yamaha 50HP outboard, connected up all the controls, rigged up a fuel tank from an lawnmower, battery etc... and after a bit of cranking it fired up. :-)
Couple of problems or observations
I fitted the water intake muffs & connected the hose pipe, it seemed to take a minute or so for water to pee out of the weep hole when the engine started, is this normal ? I already replaced the water pump impeller last weekend, so this was the first time the engine has been running for about three years or so.
After a couple of minutes, the engine alarm sounded & the high temperature indication came on the digital tacho.... I'm thinking stuck thermostat ???? I'm going to look at it tonight. Obviously I stopped it straight away... it didn't feel too hot though.
When trying to raise the revs in neutral, its got a misfire I can hear it coughing and spitting back through the air intake, I'm thinking that this is most likely that the carbs are gummed up with stale fuel... as I've replaced the plugs & serviced the engine.
Otherwise I'm well happy that my test stand has worked