5HP break-in procedure question

[gwoods27]

Just got my 5HP (130232) block back from the machine shop. Had it bored .030 and have a new .030 Piston and rings. The guy at the machine shop mentioned there is a certain way to break-in a freshly bored aluminum block. Any one know of a special procedure for breaking in a fresh engine?

 

[Rapidrob]

This biggest problem is metal particles floating around.
I would not rev the engine and hold it at a high RPM more than a couple of seconds. Allowing the engine to go from idle to about 3/4 wide open many times in a row will help to seat the rings.
If it were my engine, I would drain the oil after 20 minutes of run time and replace with fresh oil. This should remove any crap floating around after it was washed free with the first run.

 

[funky ole]

You have a 130232 engine that’s an aluminum bore? That should be iron sleeve. Also dual bearing block.

 

[creia]

130232 is an aluminum block ("Kool Bore") engine with a crankshaft that is ball-bearing supported only on the PTO end.
Michael