Maintenance & Technical > KX500 Original

piston movement/noise

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karlosthejackel:
Thanks Mike!  :mrgreen:

dave916:

--- Quote from: sandblaster on April 19, 2014, 08:20:11 AM ---I was think more along the lines of...
From this



To this



And from this



To this



--- End quote ---

when did knife edging the dividers come back into fashion{80s tuning}  :-)

sandblaster:
Hmmm.
Team Green used it well into the 90's.
Every major engine builder I have received cylinders from still use it today.
I guess my question is, when did it go out of fashion?
Is there are documented dyno runs that proves or disproves this practice?

dave916:
Yes

my early 90s tune tzr250  knifed but aimed in a certain direction


2002 rsa cylinder  Aprilla dyno 100s of cylinders ever year {moto gp racing}

sandblaster:
Thanks for posting some pics.
Now, do you have dyno numbers with and without the knife edge specific to the KX500?
The reason  I ask is because I built a bottom end with a completely stock top end all new.
Ran it for about a month then pulled the top end off and ran a cylinder that I knife edged.
Still stock port timing and the difference was amazing.
Then again butt dyno's can be deceiving which is why I ask for specific dyno numbers.
Thanks!

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