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Wiseone - drill holes on Wiseco piston for '05 YZ250?

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The instructions mention that holes should be drilled if the exhaust port is bridged. Is that the case with the '05 YZ250? I haven't got into it far enough to see the exhaust port yet.

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The instructions mention that holes should be drilled if the exhaust port is bridged. Is that the case with the '05 YZ250? I haven't got into far enough to see the exhaust port yet.

As far as I know it is not. I will be interested to see the response of those who "know" but I don't think so.

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The instructions mention that holes should be drilled if the exhaust port is bridged. Is that the case with the '05 YZ250? I haven't got into it far enough to see the exhaust port yet.

I had the same question when I did my first top end on my 04 yz250.

The answer I received was a "no". Pull the top end and you will notice there arent any holes.

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