Guys, after a few days pause from riding, when I try to start the engine, the first few turns (about 1-2 secs) i hear high-pitch squeaking sound coming from the engine - as if dry metal surface of a piston drags over dry surface of the cylinder. Very quickly the sound disappears. When on the trail, this sound does not appear when starting the motor...only during the first start at the beginning of the riding day (dunno whether its connected to cold engine or tiny lag of oil supply by the oil injector).
Should I be worried? Is this a sign of excess wear due to oil injection starting to supply oil with a small lag compared to premix (which goes in with fuel immediatelly)?
Many thanks for the advice.