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Hello Jamie,
OEM's are conservative because their product has a warrantee. Engine failure recalls are expensive and embarrassing. So ignition timing curves have less advance and fuel tables are too rich at high load to provide a margin of safety. An air cooled engine needs a wider margin of safety because the temperatures can vary more than a watercooled engine. Aftermarket tuners can take more risk with your engine. Higher octane fuel than the factory spec can balance this risk.
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Paul
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