3 months is bugger all. Disconnect the battery(battery tendered posibbly), drain the carbs(i've neglected to do this this for six months and just drained allowing fresh fuel to flow through at times), get someone you trust to move it a foot every other week, once again probably not really required. Fill the tank right up also-91 as it has less crappy additives in it. It's better to have it full as this helps reduce the amount of condesation.
Bikes are stored longer than this in m/c shops

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As long as the battery is charged and fresh fuel is in the carbs it should fire up almaost straight away. Warm it up and then take it for a decent ride, 50k-80ks or more(20kms should be ample but do are hanging out for a ride decent aren't you?). This should get rid of moister out of the engine.
Main thing is to make sure the bike is in a dry storage area covered to stop birds shitting over it, reduce dust and sunlight.
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