Hey bro,

Both top and bottom cases need some material removing with a rotary tool to clear the skirts of unmodified pistons.

The new forged pistons will be made by Wiseco, hopefully. I'm sure when they appear, Tyga will still sell them with the skirts trimmed so they can retain their 'bolt on' convenience for most online customers. But you have the option of asking Matt to send full skirted pistons with just the two holes drilled for the exhaust bridge if you want to cut your cases as i have done.

So if you keep using pistons with the skirts cut, there's no reason to modify the cases.

But I'm hoping that with equal, full length skirts on either side of the wrist pin, the piston will be better balanced as it moves up and down and won't rock in the bore as much - if indeed that was the reason for my skirts cracking earlier in the year.

I also noticed the two cooling holes are smaller in my new cast pistons compared to the originals i got with my 300 kit 5 or 6 years ago. That's perhaps a refinement that's come about more recently.
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Last edited by Hermit on Thu Jan 05, 2012 8:40 am; edited 1 time in total