Maintenance & Technical > KX500 Original

piston window

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bige:
getting ready to do a top end 03 500 and going to do all the mods listed in this site power valve, cyl clean up etc. i was wondering about a window on my weisco piston, the stock piston doesnt have a window either so what are the bennifits of a window and how to cut one in if it makes a big improvement in hp.i already plan to put a 45 degree champher on botton edge of piston skirts so more lubrication will be forced between the piston and cyl wall. has anybody done a window piston in a 500?

DoldGuy:

--- Quote from: bige on December 19, 2011, 12:31:56 PM ---getting ready to do a top end 03 500 and going to do all the mods listed in this site power valve, cyl clean up etc. i was wondering about a window on my weisco piston, the stock piston doesnt have a window either so what are the bennifits of a window and how to cut one in if it makes a big improvement in hp.i already plan to put a 45 degree champher on botton edge of piston skirts so more lubrication will be forced between the piston and cyl wall. has anybody done a window piston in a 500?

--- End quote ---

Your answer is here:

http://www.kxriders.com/forums/index.php?action=search

DoldGuy  :-D

wierdo:
I had cut my own window from the info on this site, on both standard cast and a wisco and all went well. about 2 months ago i went to see Stephen who owns "The Two Stroke Shop" here in Australia,( check out the web site) and was warmly greeted and shown around his workshop. During the show and tell i asked all kinds of questions one of them being about piston windows size and positioning, he pulled out a banshee piston and a 125 piston of some model i cant remember and they were virtually the same in size and shape( both had small holes but in multiples, ie if the main intake port had 3 sections then there was 3 small windows in the piston) . He then told me that it is unimportant the size and shape, but a window is essential to all 2 strokes. 

DoldGuy:

--- Quote from: wierdo on December 22, 2011, 11:41:03 AM ---I had cut my own window from the info on this site, on both standard cast and a wisco and all went well. about 2 months ago i went to see Stephen who owns "The Two Stroke Shop" here in Australia,( check out the web site) and was warmly greeted and shown around his workshop. During the show and tell i asked all kinds of questions one of them being about piston windows size and positioning, he pulled out a banshee piston and a 125 piston of some model i cant remember and they were virtually the same in size and shape( both had small holes but in multiples, ie if the main intake port had 3 sections then there was 3 small windows in the piston) . He then told me that it is unimportant the size and shape, but a window is essential to all 2 strokes. 

--- End quote ---

I do not know Steve, have not talked with Steve or have had any business dealings with him, so use the info as you will.

http://www.rzrd500.com/phpBB2/viewtopic.php?t=7287

wierdo:
Hows it goin Doldguy, Steve was a race engineer for Wayne Gardiner back in the day of the mighty 500 2 strokes, this guy knows what he is talking about when it comes to 2 strokes. He showed me an all new banshee motor that he has his own conversion for, to turn a 350 banshee into a 500 twin motor that converts a 250 aprillia pussy cat into a  road registered 500 GP, and also has plans for the same motor to go into a KTM motard. He's also looking at making his own heads with fuel injection. I love the way this guy thinks. I tried my hardest to persuade him to rebuild my k5 motor, even left it with him for a week hoping he would do it for me, but he's just so flat out with his road bikes. He was a real gentleman about it all and recomended a couple of other people and even dropped the motor of to the guy that is doing it for me now. I'm looking forward to going back soon just to see what he's been up to.

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