Longer Break In ?

"Dear Ralph" October 28, 1997 0
Dear Ralph: I’ve heard that these new “Nicasil” cylinder liners have a longer break-in period than do the cast liners. How many miles should...

Dear Ralph:

I’ve heard that these new “Nicasil” cylinder liners have a longer break-in period than do the cast liners. How many miles should I wait before I change jets and expect full power from the engine?

It isn’t so much breaking in the cylinders as it is to get the rings to “seat” and come up to full compression. Since the nicasil cylinder liners are harder than those of cast iron, they will require a longer period of time for the rings to seat. How much longer ? This depends on who you ask. Maybe an extra tank of fuel. This business about it taking 500 miles to break in the engine (before you change the jetting) is likely nothing more than an attempt to keep warranty claims down. The first 150 miles is when the majority of improvement will occur, and you should be able to jet accordingly for the conditions.

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