....because the ''answers'' only bring up more questions.
For instance....the article in M.A.N. with the Clarence Lee
recommendations states that..."if you balance all of the
conrod and wristpin weight and 1/4 to 1/3 of the piston
weight, you will be pretty darned close to having an
engine run as smoothly as possible".

Well, thank you so much Clarence for that precise
estimate. Yes, precision guesswork is always
better than strict facts, guidelines, or blueprinting. The
article on "Solving engine Vibration" was a joke.

Did you think that the engine tweakers were actually
gonna give up their secrets ? ( yeah right ) Guess again.

Here's another Ditty....(same article)..."Clarence suggests
that you add or remove weight from the crankshaft counter
balance by trial and error to "discover the smoothest run"
within a given rpm range. Isn't that special ! :stupid:

Thank you Dave Gierke, for the article....and Mr Lee for
telling us how to solve our engine vibration problems.
( please note my sarcasm )

Let's look and think about the article posted by my friend
ChuckAuger ( he is my friend ) for a minute, shall we ?

Article titled "crank shaft balancing". In the first place...
there is no such thing as crank balancing with a half-
sided crank, and the rod hanging out in the breeze. Put a
crank in the stand, and you'll see what I mean.

Lightening up the already "light" end of the crank....to compensate for a too heavy piston/rod assy doesn't
make sense for two reasons....( maybe three )

1- William Robison's ( post # 26 ) explanation of accel.
at TDC is fact. So, if the piston/rod assy is heavy, why
would one remove material at the crank to compinsate ?
Doesn't make sense....he's not balancing the crankshaft
at all. He's ''imbalancing'' the already out of balance
crank. I think it's the wrong end to lighten.

Simply put....a lighter weight on the end of a "yank", will
create less vibration than "yanking back" a heavier weight.
K&B engines have holes in the pistons to lighten them.

2- The grinding away of the conn. rod support to lighten
up the top-end weight is silly. The piston assy is the
problem with the vibration...not the crank.

3- I'm not going for the theory (or explaination) that
crankshaft balance is a mystery, and cannot be explained.
Single cyl. engines have been around for quite awhile now,
like over 125 years ! So I guess we'll keep hackin', and
grindin'....till we "discover the smoothest run within a
given rpm range".

Mr. Unbalanced....