Motorcycle Repair: engine break in, air fuel mixture, engine longevity

Question
Hi,
I always break my engines in easy...
Take a look at this and is this guy full of crap or is there any truth to it.
http://www.mototuneusa.com/break_in_secrets.htm
Long article!


Thanks for your time
Josh

Answer
Hi Josh,

I happen to agree with the author of the article/website and practice much of the same.

Consider this:

My two and four stroke cycle roadrace engines go to extreme load limits immediately following assembly of a fresh set of cylinders with new pistons and rings.

There's never been any indication of damage or excessive wear. I've seized a piston from incorrect air-fuel mixture, though not quick break-in.

Cylinder cross-hatch actually determines break-in period. Race engines use a greater cross-hatch angle for quick break-in unlike a street MC engine, which has less angle for oil retention.

I've also worked with many guys who assemembled MC's from the crate who run the MC hard during the test ride just after warming the engine.

For engine longevity, always allow any engine to reach operating temperatures before putting a load on the engine (riding).

Respectfully,
Mark Shively