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16 Jan 2020
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TOPIC: Octane ... ?

Octane ... ? 6 months 1 week ago #7730

  • MarkBacon
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I've been running my Saturno 500 on 98 octane, 95 at a pinch, but I wonder if that's really necessary, or if the 91 that's standard here in NZ would be fine?
When I had the engine apart I the combustion chamber and the piston crown didn't look to me like they'd demand high octane, and the CR isn't all that high. Moreover, Saturnos were originally designed/built for sale in Japan originally, and Japan had standardised on 91 Octane by then.
Is there any hard evidence that higher octane than 91 is necessary? Is anyone out there running their Saturno on 91?

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Octane ... ? 6 months 5 days ago #7733

  • pppdrive
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Hi Mark, I used to have two Saturnos and run both on 91 with no problem at all. I did use a lead additive for about a year but was told it wasn't really required. Where in NZ are you as I usually travel at least once a year to the Taranaki area. Paul

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Octane ... ? 6 months 4 days ago #7734

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Hello Paul - I'm in Wellington, Island Bay.
Thanks for the info - I've been wondering for a while if I really needed to bother with 95/98.
When I pulled the head/barrel there were some deposits on the back of the inlet valves and the carbon on the piston crown was a bit thicker/crustier than I liked, so I"e been running Moreys Upper Cylinder lube since. I think I'll keep using that with 91.

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Octane ... ? 6 months 4 days ago #7739

  • pppdrive
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Hi Mark, just remembered that I used to put 98 in every 4th fill up. Not really sure why I did that but I still do that today with my car, 3 times 91 and 4th 98. Never had a problem with either bike and the red one certainly got some usage every day. Enjoy yours, I really miss mine but at just over 70, I decided that I should give up riding bikes and reluctantly the 4 bikes I had were all sold.

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Octane ... ? 3 months 23 hours ago #7835

  • Db7gtgrigio
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Im in Sydney and only ever use 91 in both my Saturnos even on track. never had any pinking or other issues.

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Octane ... ? 3 months 21 hours ago #7836

  • MarkBacon
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I've been using 91 with Morey's for a while now, and the Saturno feels better on that than it did on 98.

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