trailboss503,

                 I own a SELOC repair manual number 1308 for Evinrude and Johnson outboard motors.  It states "NEVER operate the engine over 1000 RPM with a flush device attached, because the engine may "RUNAWAY" due to the no load condition on the propellor."

It also states "To test the water pump , the lower unit MUST be moved into a body of water."

An outboard repair shop backs the trailer and boat into a water filled pit or uses a barrel full of water to test your engine.  This will keep the propellor from spinning too fast and also ensure that the engine has a adequate supply of water to cool the engine.  They shouldn't rev the engine with a flush device.  If they do, you need a new outboard mechanic.

Do you believe me now?  

This is why there is a tank at most shops.  Some use a 55 gal drum for smaller o/b's

Always have water going into the engine when you start it, rather it is at the lake, ear muffs, or lower unit in a trash can or bucket.  Running the engine without water can hurt the water impeller or engine.  The impeller could come apart because it is just a piece of rubber.  And the engine could over heat if you run it long enough without water to cool it down.  

I don't completely start it, but I ALWAYS turn it over once before hitching up.  And then once again before backing down the ramp.

Outboard engines cost a lot of money.  I would be dang sure I knew what I was saying before I recommended something to someone.

just my opinon

Happy Releasing,

H.G.