Quote:
you should run the lowest grade you can without the engine pinging. Octane is not a quality rating it is resistance to pre-ignition. With the 904 I can see a possible need for a little higher rating due to the increased compression.
+1 
If you fellows don't mind spending extra $$$'s on a higher octane gasoline for an engine that really doesn't need it, why not just send your extra $$$ to Ian and I. We won't mind one bit and we really need it for more chrome. 
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
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