And I'd take the carbs off and give them a good clean. 4 years of gum in there will not help at all. The last thing you want is a jet blocking and the engine siezing.

It's tempting not to bother, but you'll be soooo pissed off if it siezes and you could have prevented it.

Check the brake pads, and replace the fluid - it should be done every couple of years to be on the safe side.
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