Mine seems to have got worse lately in exactly the same way...as you say, dropping down quickly while riding, then 'recovering' while parked up.

Even does it overnight, so it's not due to the fuel expanding when hot. Quite the opposite it seems.

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I spent a lot of money on travel and racing motorcycles - the rest I just squandered.

XT660Z - Commuter, Adventurer...Racer?

www.dashmoto.net

Other bikes >> MT-03 / CG125BR-J / ER-6F
Departed >> ZXR400L3 / EC300 / DR-Z400E / DR800S / GPZ500S / GS400