Jack:
After break-in FW mentioned, before you put it in the air, change
to a new plug like the OS A-3. On a new engine you will get
residue of metal grunge that will cake the glow coil and cause low
performance and deadsticks. The A-3 cost more but is worth it.
Too many pilots can't figure out why their new engine keeps dying
after 2 or 3 min. in the air. If it is not too lean on the ground, then
it is usually the plug.

Randy