Maintenance & Technical > KX500 Original

Crank Balancing

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don46:
Cam,

I know nothing about crank balancing, I thought I would open the discussion so perhaps somebody that did know would enlighten me. Looking at Doordie's crank, it appears alot of metal was removed. Also I would think it will make a difference as to what piston you were to run, a Wiesco may be lighter than a stocker, so if balanced with a stocker you would want to stay with that same type.

Maybe somebody that is in the know will chime in.

Platypus:
I just found this by doing some google searches for 2 stroke crank balancing:

Can a single cylinder crankshaft be balanced? Does it help?
A single cylinder crank is always unbalanced. The balancing operation we
perform moves that unbalance (vibration) that is either higer or lower than
your engine's RPM operating range. We accomplish this by removing or adding
weight to the crank in a location that our balancing equipment has told us
to do so. Balancing or "moving the unbalance" really helps a single cylinder
crank, especially if it is to be used at sustained high speeds.

Here is a company that makes equipment for balancing cranks:

http://www.cwtindustries.com/crankshaft%20balancer.htm

So they basically try to hide the imbalance in an RPM range that is rarely used.  For someone like me that is all over the board when I'm racing because I get tired or can't deal well with the terrain I don't think it's going to make that big of a difference.  Take someone with consistency and I think it would make for a much smoother ride overall.

doordie:
Here is a another pic of Mike Meldes works on a twin. 8-)

It?s something with the power stays longer and will not
"flatten out" in high rpm range... :|
It will not stress crank "tap" as flywheel weights does and more centred of engine.
In tarmac racing it?s make a huge different because 100% grip. :evil:

Platypus,sorry "one of kind" :cry:

Desert Panther:

--- Quote from: doordie on September 20, 2007, 06:16:18 AM ---Here is a another pic of Mike Meldes works on a twin. 8-)

It?s something with the power stays longer and will not
"flatten out" in high rpm range... :|
It will not stress crank "tap" as flywheel weights does and more centred of engine.
In tarmac racing it?s make a huge different because 100% grip. :evil:

Platypus,sorry "one of kind" :cry:

--- End quote ---

What kind of engine is that?!?! It has twin cranks?  :-o     although I think Suzuki made a 500cc 4 cylinder  2 stroke that had a setup like that, called the RG500 Gama?

kaw rider:
Doordie
how much weight was added to your crank.

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