@ Chris. The tank/petcock setup is not vacuum operated. Spark plugs do not need replacing or the air filter - The bike goes like a bat out of hades for 100's of KM before I get about an inch from the fuel line/carby intake height. I'm starting to think that this is just the lowest it can go before pressurization is needed, and maybe the first time I ran it lower I was just really lucky.
Actually the first time I ran it low (lower than last this week) I was using the normal Safari tank cap. Now I use the lockable version with tank filter (which I know doesnt create a seal on the top of the tank). So maybe the change in tank cap has made the difference?
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