I have to disagree with your (Break-In) theory. The oil scraper rings are for scraping the oil on the down stroke, not the up. This prevents the oil from accumulating in the combustion chamber and with enough oil vapor, causes what's known as the diesel effect. As a diesel mechanic this is fact. Also the rings don't seal better by being run hard. They wear the cross hatch pattern off faster, thereby allowing more blowby....
Just my 2 cents worth.
~Mototune USA Viewer
Dear Mototune USA Viewer,
WHOOoopps ! You're right. I really messed up the part where I wrote:
"Contrary to popular belief, piston rings don't seal the combustion pressure by spring tension. Ring tension is necessary only to "scrape" the oil as the piston goes back up the bore."
( I guess I said "up" when I shoulda been gettin' down !!! )
Thanx for catching that mistake ... I've corrected the original version !
As for the break in method, I realize it goes
"against the grain" and not everyone will agree with it. I've
always felt that it's best to learn both sides of a story and then make
your choice. Lots of people have commented to me that Mototune engines are
really fast. This break in technique is one of
the reasons why.
What's wrong with this
The tool he's using is touching the inside of the
What's the big deal ???
The small burr went unnoticed, but the rider will
definitely notice that his bike is slow !!
Ironically, this common problem
was caused while Wild Billy was trying* to make his engine faster.
* When you try
to do something... nothing happens.
The solution is to use a longer extension. The part that
passes near the cam journal is safely clear of contacting it.
careful not to touch the edges while inserting it. It's easy to dent the
Once you realize how much power this problem costs, you'll start checking for burrs on every running surface of an
This is how it should look. No burrs, no scores, no worries.
Lot's of trophies !!
So, to answer the age old
question that's haunted many a man:
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