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Drained the tank this evening and put in 5L of Esso Supreme 97 - but as I am in Scotland, they put the 5% ethanol in there. I'll just have to make sure I don't let it sit again!
Unfortunately not much changed - as it warms up the idle moves up to 3k and stays there, and it hesitates significantly around 3.5-4.5k (possibly from 'normal' idle all the way to 5k, if the idle were where it should be), and then pulls more or less strong all the way to ~8k (maybe one or two hesitations as it's pulling up from 5k). Cruising at speed at 4.5k+ is smooth, but low speed stuff where I find myself holding ~3.5-4k it is all over the place.
Pulled the plugs - top cylinder is dry and white around the tip, black around the thread. Front cylinder is dry & black all over. White = lean right?
I need to wait until I've got a new air filter as the one in it really is quite filthy (or has yellowed with age). I'm not sure how old the fuel filter is, either, so I'll get a replacement. I was thinking of attempting running it without the air filter to see if that improved anything, but I think I risk leaning it out further, so I don't think it's a good idea.
Otherwise I think it might be time to invest in a set of carbtune gauges and get to balancing them, adjusting the pilot mixtures, and going from there.
And I guess I should probably strip them off and give them a clean, first.
Time to learn a whole lot more about carbs!
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