When turning bike upside down to do linkage is it necessary to drain all fluids from bike.

On 1/20/2016 at 6:43 PM, sirdabalot said:

Clean as much dirt off as possible. Get a jack up stand or better, turn the bike upside down. Back wheel off. Get some spanners and Allan keys remove the dog bone linkages and the centre link assembly. Now clean these parts even more and the area surrounding the bearing in the underside of th swinging arm. Push out the bushes, noting which came from where, clean the old grease from the needle bearings, take care not dislodge the needles. Put some waterproof grease on your finger and smooth it into the bearings. Refit the bushes, wipe off excess grease, so dirt won't stick to seals, reassemble and tighten parts to manufacturers spec, or very tight.

If I turn the bike upside down wont there be leakage from the trans oil or will it run up into a part of the engine it shouldnt ?