50hr service and inspection
Replace spark plugs
Drain oil
Check supercharger impeller
Check air filter
Check impeller
Check battery.
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.
I found oil seals face fitted up side down. I asked customer and he said this jet pump unit just been serviced by other shop couple month ago as they replaced oil seals and bearing. So they fitted oil seals wrong side,,,,,,,, nice job, isn' it?
This face of oil seal was out side. All 3 of seals fitted wrong side,,,, 
This face should be out side.
Water got into inside of bearing room because oil seals were fttting wrong side. Front bearing damaged already by rust.
New parts all Kawasaki Genuine. Was after market parts.
This is correct way to fit oil seals.
This ski came to shop for noise from jet pump unit. 
Disconnect Jet pump unit.
Impeller housing has been swelled by corrosion and hit impeller. This is cause of noise from jet pump.
Scratch mark of impeller housing after disconnect impeller. Now this ski need to replace impeller housing.
Received HWSM from Japan today. This magazine editorial office in TOKYO had damage by earthquake last month but they put in an effort to issue on time for this magazines readers. Thanks for HWSM staff !
This ski was sick for long time as runs bad. Owner took to other shop twice but still ski was running not good. So owner was not happy to just pay money without fix ski.
Unbelievable, I found over 1L of water from fuel tank. Of course with this condition ski does't run well. This water must be sitting bottom of tank so long time because color change to brown. Now ski runs back to normal as owner is very happy.
This U-150 customer had rebuild motor by himself but after engine run motor broken straight away. Let's have a look what happend.
#3 cylinder spark plug color show damaged piston.
Customer serviced carby but variable venturi diaphragm didn't fit proper because diaphragm didn't move as make lean fuel condition. 
Also customer forgot to fit valve and seat fix screw because V/S moved to up side as arm lifting stroke make too short. This is another reason for lean fuel.
#3 Piston top was damaged as melted. 
Another surprise, when customer put back carby assy he tucked oil hose between carby and manifold.
Lucky this #1 cylinder didn't damage because engine stop straight away.
Front view of Throttle body, TPS is RH side.
Side view of Throttle body, TPS is center.
Broken TPS is 614 ohms as out of STD
New TPS is 4.6 K ohms as within STD
This is Kawasaki SX-R but something different,,,,,
Yes, engine is 15F motor.
It is amazing! This stand up jet ski product by Sato Engineering (SE). SE is famous Japanese jet ski engineering, they producted X-2 with 15F motor for last year boat show and this year they made SR-R with 15F motor.
