This thread is a little old now but I found it the other day so I joined the site to make this post.
I have been developing big bore kits for the KX 500 for about a year now. I am now testing a big-bore kit using a 97mm piston with a standard 86mm stroke which gives 635cc, I have already tryied a stock piston with an 88mm stroke which I get using a 27mm pin and big-end and offset boring a stock crank. The next step is the 97mm piston and the 88mm stroke which will give me 650cc after that I am looking at a billet crank with a 90mm stroke giving 665cc.
To use the piston you need to bore out your stock barrel and install a Moly-Iron liner, also a small amout of case machining is needed to take the larger skirt diamiter that this gives.
I got a mail saying that you PM'd me, as this is the only post I have ever made on this website I assume its about the above?? Unfortunatly I can't access my messages on this site, something is not working with my account. So please email me [email protected]. Cheers BERT
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