Sea King Midget powerhead rebuild.

[keplerfan]

O.K. …So, I’ve never rebuilt a powerhead before and I would like to rebuild a midget from ’46. Do I just hone the cylinders and get new rings or what? What is the basic procedure for rebuilding a powerhead? Where do I get rings?

Thanks.
Neil.

[cajuncook1]

I guess the first question would come to mind would be why does the powerhead need to be rebuilt?
– Low compression?
– broken rings?
– out of specs for bore diameter?

I am certainly not an expert on your little motor, but use caution before deciding to hone and re-ring a motor of that vintage. That little motor does not pop up often.

I dug up this information that Frank Rob posted regarding the little Evinrude midget.

quote :

1939-47 Sea King Midget Single; 1cyl, 1-3/8″ bore x 1-3/8″ stroke, piston displacement 2.0 cu in, 1 hp @ 3750 rpn, 2 blade prop, breaker point gap .020″, Spark plug Champion 6M or J-9 @ .025″ gap, Shear pin 5/32″ x 3/4″ aluminum, weight 13 lbs, oil 1/3 pint SAE 30 non-detergent per gallon (24:1), fuel tank capacity 1-3/4 pints, run time, full tank 1 hr, 30 min to 2 hours, water cooled, rope start.

[joecb]

What cajuncook said X2 … also often in these small motors the problem with hard starting and/or poor idle is not the bore and rings but rather poor crankcase compression due to worn crankshaft bearings. Fixing that problem is a job for the machine shop. Lateral movement of the flywheel = worn bearings.

Joe B

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