No start - 1971 Evinrude 25hp

[cufishin]

I'm having trouble getting this old Rude to fire up, It does have electric start but the starter wont really spin the motor too well, maybe 1 revolution per second. If I pull the plugs it will spin fine.

I've got good spark on both plugs, fuel is getting to the cylinders but All I'm getting is an occasional combustion.

The motor seems to have good compression although I haven't put a tester on it yet.

I'm just wondering what I am missing, or what my next move should be.

[Way2slow]

Bad battery, bad cable connection at battery, starter or ground.  These could all be checked with a voltmeter and checking the voltage drop.  Could be a dragging starter or internal problem in engine.

The flywheel should be turning 250 rpm to generate the proper spark to start the engine.   Until you find the cause of the slow cranking speed, it's probably not going to start with the starter.   

Many of the small motors have a pull rope slot in the top of the flywheel (even the electric start ones).  If it spins over good with a rope, that probably means the inside of the motor is good and your'e problem is electrical.