Thread: 1998 50hp evinrude outboard

Johnson Evinrude 40 48 50 HP two cylinder outboards should only be run on a hose sparingly for a very scary reason. These motors can at times " run off " by themselves , by this I mean with out back pressure the engine may start to rev all by itself to the point of running at WOT, I have seen this twice in person and let me tell you that is the scariest thing you will ever see, key off, kill switch pulled and motor running 5 grand on a hose. The only way to stop it is turn the key back on and push in the choke which with the primer system it basically floods out the motor. In all my years of working on these motors, mid 80's on I only run them on the hose as needed, every thing else is done in the water at the ramp

Now You scared me,Im draging this to the boat ramp, im going to do this during the week.I was going to start it up and let it idle on a 6 gal tank of fuel with a about 40/1 oil mix and let it break in but now Im not will go ahead and do it in the lake....Thanks for the heads-up.

The way I broke in a rebuilt power head was take it to the ramp , start it in the water let it warm up then run at about half throttle for 3-4 minutes then WOT for about 30 secs, let idle to cool , shut down cool completely then repeat 3-4 times , after that run while fishing, idle, half throttle max for about 4 hours after that up and down rpms from idle to WOT for a few minutes each , the first part is to make sure it will stay together after that , time for the rings to " cut" in, after first tank with oil in it, if motor is oil injected you can run 100 to 1 on next tank and begin to run as you would normally. One thing you have to realize at the factory they test run motors from assembly line to WOT and try to blow them up, I've seen it, if it stays together it ships, so if it works for them it will work for you