Oil leaks can be as mysterious and exasperating as women (and damn near as expensive).
One time my K9 was leaking on the right side. Some of the oil migrated down to the left because of leaning over on the kickstand. But we figured it out and traced it to the right side and changed the transmission output seal. Not very costly and a fairly easy job.
The leak remained unchanged. Made a hell of a mess, and it also slung oil all over the drive belt, which attracted sand and grit, contributing to excessive wear on the rear pulley. Then I drained the primary found and it was overfilled. There was more than 32 oz that went in at the last change. So somehow oil was leaking into the primary. Had to be engine or transmission.
The leak got worse, and Blacktopper noted that there was enough of it that maybe to monitor both the transmission oil (input seal) and engine oil (primary seal) would provide a clue . Blacktopper finally figured it out--the crankshaft seal was leaking engine oil into the primary, which would then overfill and allow some oil to run through the tunnel for the clutch activating rod and drip on the right side, mimicking a transmission output shaft seal leak.
Since the engine oil won't hurt anything in the primary, I just drained out a few ounces of primary to keep the level down until it was convenient to change the front crank seal. Changing the seal itself isn't too bad, but getting at it is.....(used a 3/4" drive three foot long torque wrench with a pipe extension to break loose that damn nut on the crank.)
