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<blockquote data-quote="AndyN" data-source="post: 169028" data-attributes="member: 4109"><p>Your richness experience is like mine. The spark plugs I use are generally one grade hotter than original spec in different bike makes. That may be the fuel, or maybe because we all go so slowly nowadays. I've also leaned out the carbs on my BMW 1956 R50 by dropping the needles all the way because they turned sooty last year.</p><p></p><p>The mystery is that, chemical science says that the ethanol in the fuel should make the engines run leaner (whether at 5 or 10 %) , but that is not my experience. </p><p></p><p> My 70s Ducatis killed plugs all the time. I never went out without a spare pair and a plug spanner. Speculating wildly, I think that modern petrol/gasoline may contain a heavy fraction of hydrocarbon that won't burn quick enough in our old engines and that's what's ending up stuck to our plugs. Modern engines are running at much higher CR - around 12.6:1 compression ratio with fantastic spark voltage so we know they can eat it. </p><p></p><p>The gasoline we buy is a complete mystery mix and there's no transparency about its formulation, except for the ethanol value and winter/summer volatility. Basically, it is not formulated for our engines and we are lucky that they run on it at all. My view is that we have to find a way to live with it by tuning, ignition, plugs and engine set up. </p><p></p><p>I've tried Aspen chainsaw fuel (and Stihl market one too) and they seem fine but they are super expensive, I tend to keep them for the last ride of the autumn, (if I remember), because they are claimed not to degrade in power tools kept in sheds outside all through Scandinavian or Canadian winters.</p></blockquote><p></p>
[QUOTE="AndyN, post: 169028, member: 4109"] Your richness experience is like mine. The spark plugs I use are generally one grade hotter than original spec in different bike makes. That may be the fuel, or maybe because we all go so slowly nowadays. I've also leaned out the carbs on my BMW 1956 R50 by dropping the needles all the way because they turned sooty last year. The mystery is that, chemical science says that the ethanol in the fuel should make the engines run leaner (whether at 5 or 10 %) , but that is not my experience. My 70s Ducatis killed plugs all the time. I never went out without a spare pair and a plug spanner. Speculating wildly, I think that modern petrol/gasoline may contain a heavy fraction of hydrocarbon that won't burn quick enough in our old engines and that's what's ending up stuck to our plugs. Modern engines are running at much higher CR - around 12.6:1 compression ratio with fantastic spark voltage so we know they can eat it. The gasoline we buy is a complete mystery mix and there's no transparency about its formulation, except for the ethanol value and winter/summer volatility. Basically, it is not formulated for our engines and we are lucky that they run on it at all. My view is that we have to find a way to live with it by tuning, ignition, plugs and engine set up. I've tried Aspen chainsaw fuel (and Stihl market one too) and they seem fine but they are super expensive, I tend to keep them for the last ride of the autumn, (if I remember), because they are claimed not to degrade in power tools kept in sheds outside all through Scandinavian or Canadian winters. [/QUOTE]
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