Dennis:

That is true, but 40 hours seems a bit long.  About 15 hours sounds more like what I saw with two sets of CermiNils I had on a twin about five years ago.   I'd change the oil and filter at 5 hours and again in 15 more, then go to your regular oil changes intervals.  That'd probably do it.

Walter


On May 1, 2005, at 5:48 PM, Dennis Johnson wrote:

Hi Walter,
 
I'm getting a rebuilt TCM IO-550 with CermiNil nickel coated cylinders.  I've heard that they take longer to break-in, as much as 40 hours, because the cylinders are so hard.  When you mentioned that most engines are broken-in after five hours, does that include nickel coated cylinders?
 
Thanks so much for your help,
Dennis Johnson