I remember guys mixing going with less and less oil in the 70s - thinking more gas and less oil would make for more power. And then cycle magazine did a dyno test showing that more oil actually increased hp output - and they did rejet for each run. Running more oil in the mix - you get better ring seal and you also you get better heat dissipation away from the piston as the oil helps conduct the heat away, and you get better lubrication of the crank bearings (and heat dissipation benefits there too).
Honda recommends 36:1 full synthetic in a CR250 for racing.
GasGas recommends 50:1 full synthetic in an ec250 in the manual. The gasgas must meet european emissions standards and running at 50:1 will reduce smoke and emissions overall.
The question is - if gasgas were spec'ing out oil mixture ratios for solely a racing environment without consideration of the road use of the bike, would they, like honda did for the cr250, have picked 36:1 as the recommended mixture ratio?
jeff
Last edited by jeffd; 05-17-2007 at 07:08 PM.
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