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- - z400 (https://atvconnection.com/forums/technical-how-articles/305511-z400.html)

teven

01-20-2009 10:44 PM

z400

I have always been told to run 91, but does it really matter, around here we have 85, 87, or 91 whats best?

sluckman

01-20-2009 11:53 PM

z400

If you can afford it, buy it.

ss97	01-21-2009 01:35 PM

z400

The compression ratio on a z400 is too high to run 87 octane without eventually causing valve run out..... anything over 11:1 compression should run 91 octane.....

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