Ahh gasoline ,,its all a mixture of different stuff designed to do different things , and a engine designer will design an Engine for the gas e.g the cbr 250 , high reving small chambers, uses 91 in the current singapore form ( or were ever its distilled )as 98 ?? or what ever is called will leave deposits on the plug ,,ie not get hot enough , quick enough
Summer winter , its different gas ..the volitiles are different ( now this is a quick reply as I have some drinking to do )
Soo, If you fill the gas tank up to the to ..the ONLY place the volitiles have to go is through a wee tiny hole in the gas cap ..ie takes a long time , but it will happen.
Carbs have LOVELY big holes,,, vents, jets , screwdriver holes

,,and the volitiles will dissapear real quick ....leaving .....
the heavy stuff that is designed to burn at a higher temp ,,, ,
leave that and you go green , with pond life ,,,, leave that ,,,and you start drilling jets
and in iceland it takes forever, here in the tropics can take a few weeks to a month
Stephen
Oh btw I have never seen a rubber o ring go hard if its in the right environment.
age will do it , vibration will do it chemical attack will do it ..
but gasoline gets blamed for far to many things these days ...oh your bike runs badly , you are using that new unleaded ,,,,* I think there was once in NZ when they changed refineries , to maybe singapore and the blend wasnt suited to NZ older fleet ,and yes there were isolated cases ,,,
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