z400

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Jan 20, 2009 | 10:44 PM

teven

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Trailblazer

Joined: Dec 2005

Posts: 38

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z400

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

Jan 20, 2009 | 11:53 PM

sluckman

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Joined: Dec 2008

Posts: 28

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z400

If you can afford it, buy it.

Jan 21, 2009 | 01:35 PM

ss97

Pro Rider
Lets Ride!

Joined: Jun 2004

Posts: 2,190

Likes: 1

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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