Engine oil was too much of Yamaha FX-140

This ski came to shop for 50hr service. Engine was very hard to start and idle speed was very rough.

Inside of air box

Air filter was very oily and need to replace

Much oil was sitting bottom of air box

Oil level was too much as white line. Top level is yellow line. Amazing! 6L of oil was in motor, STD is 4.3L. Asked customer which he filled up oil him self but he said since last service at other shop he didn't fill any oil. So must be over filled by other shop. This is cause of blew oil to air box from blow-by hose and that was involved air filter damaged by oil, spark plugs made a dirty and hard to start and rough idling.

Spark plugs were oily and drity.

This Yamaha FX 140, HO(160)and VX series motor is hard to check oil level as show different level depend on skis angle and when engine stopped  because this motor is dry sump lubrication system.  Some shop doesn't know about this things and over fill oil. Also this motor is hard to drain all oil as just suck oil from oil tank about 2L of 4.3L, in short  just change oil less than half because oil is still black after change oil. However Jet Ski Doctor we know how to drain more oil as almost drain 4L of oil so after change oil color is clear.
If your motor oil color is black after service no reason to come back to that shop. Please try our best service next.