Piston/Ring Kit for Kawasaki - STX 15 F 13001-3737 2004-2021

SBT Kawasaki jet ski pistons are high quality, high strength, cast eutectic pistons. Our "standard" pistons are comparable to others premium pistons - anodized on the top surface for better heat resistance and surface strength, graphite coated on the sides to reduce friction between the piston and cylinder and enable efficient break in. SBT is so confident in the quality of our pistons that all pistons come with a LIFETIME warranty against manufacturers defect!

The Kawasaki 15F Piston Kit comes with our piston, complete set of steel rings, cir-clips, and piston pin - everything you need for swapping out a piston in your engine. Standard Size

 

Replaces OEM: 13001-3737

2004 Kawasaki STX-15F

2006 Kawasaki STX-15F

2007 Kawasaki STX-15F

2007 Kawasaki Ultra LX

2008 Kawasaki STX-15F

2008 Kawasaki Ultra LX

2009 Kawasaki STX-15F

2009 Kawasaki ULTRA LX

2010 Kawasaki STX-15F

2010 Kawasaki ULTRA LX

2011 Kawasaki STX-15F

2011 Kawasaki ULTRA LX

2013 Kawasaki STX-15F

2015 Kawasaki STX-15F

2015 Kawasaki Ultra LX

2016 Kawasaki STX-15F

2016 Kawasaki Ultra LX

2017 Kawasaki SX-R

2017 Kawasaki STX-15F

2017 Kawasaki Ultra LX

2018 Kawasaki SX-R

2018 Kawasaki STX-15F

2018 Kawasaki Ultra LX

2019 Kawasaki SX-R

2019 Kawasaki STX-15F

2019 Kawasaki Ultra LX

2020 Kawasaki STX 160LX

2020 Kawasaki SX-R

2020 Kawasaki STX 160

2020 Kawasaki STX 160X

2021 Kawasaki SX-R

2021 Kawasaki Ultra LX

2021 Kawasaki STX 160

2021 Kawasaki STX 160X

2021 Kawasaki STX 160LX

2022 Kawasaki STX 160

2022 Kawasaki STX 160LX

2022 Kawasaki STX 160X

2022 Kawasaki SX-R

2023 Kawasaki STX 160

2023 Kawasaki STX 160LX

2023 Kawasaki STX 160X

2023 Kawasaki SX-R

Piston to Cylinder Clearance:
The piston size plus the clearance equals the final bore size. For the recommended clearances by make and model, see Table 1. The cylinder first should be bored to within 0.002” of the final bore size. The remaining 0.002” should be removed with a 400 grit cylinder hone. The honing process should be controlled such as to leave a 45 degree crosshatch pattern on the cylinder wall.

Port Chamfering:
Once the cylinder is honed to the final size, all of the ports in the cylinder wall should be chamfered with a file or chamfer tool. The chamfered edge should be cut at approximately a 30 degree angle around the entire port. The cylinder should then be honed with a 400 grit flex hone to apply a uniform finish and to re-establish the 45 degree cross-hatch pattern.

Cylinder Cleaning Process:
Clean cylinders in warm soapy water using a firm plastic brush (such as a tooth brush), then dry, and immediately lubricate with 2-stroke oil. Honing grit tends to reside in the crosshatch and must be scrubbed out. An extremely clean cylinder free of grit is critical in order to avoid “drag marks” and other damage to the cylinder wall after assembly.

Setting the Ring Cap:
Place the piston ring in the cylinder. Use the piston to push the ring approximately 5mm from the top of the cylinder in order to square the ring in the cylinder. Use a feeler gauge to measure the gap between the ends of the ring. If the gap is too small, one end of the ring must be filed. Re-install the ring and measure again to confirm the final dimension. Recommended ring gap clearances are shown in Table 2.


Piston Installation:
Install the base gasket (we recommend Threebond 1211 as a gasket treatment). Lubricate the wrist pin bearing with 2-stroke oil and install the piston on the connecting rod. The designation mark on the piston crown points in the direction as shown in Table 3. Install the c-clips with the open end in either the 6 or 12 o'clock position. Install the rings onto the piston. Using your hands or a ring compressor, collapse the rings into the ring grooves and install the cylinder. Torque cylinder to proper torque specifications.

Table 1: Piston to Cylinder Clearance
Clearance	Application
2 Stroke
.004”-.005”	Kawasaki 440, 550, 650, 750, 900, 1100 Yamaha 500, 650, 701, 760, 1100, 1200
.0045”-.0055”	Yamaha 800, 1200pv, 1300
.005”-.006”	Seadoo 580, 650, 720, 800 Polaris 650, 750, 780, 900 Kawasaki 1200
.007”-.008”	Polaris 700, 1050 Seadoo 951, 800 RFI
4 Strokes
.001”-.0022”	Seadoo 112 (N/A)
.002”-.004”	Seadoo 113 (S/C)
.002”-.003”	Yamaha 408, 410, 411
.0015”-.0025”	Kawasaki 213, 214
.0005”-.0015”	Honda 600, 601

Table 2: Ring End Gap
Clearance/Tolerance	Application
2 Strokes
.011” +/- .003”	Kawasaki 1100
.012” +/- .002”	Seadoo 800
.012”+/- .004”	Kawasaki 440, 550, 650 Yamaha 500, 650, 701, 760, 1100, 1200, 800,1200pv Tigershark 640, 770, 1000
.013” +/- .003”	Seadoo 580, 650, 720 Kawasaki 750, 900, 1200
.013” +/- .005”	Polaris 650, 700, 750, 780
.014” +/- .004”	Polaris 900, 1050
.019” +/- .001”	Tigershark 900
.022” +/- .003”	Seadoo 951/DI
4 Strokes
.015”-.021”	Yamaha FX Top Ring
.019”-.027”	Yamaha FX Middle Ring
.011”-.023”	Yamaha FX Oil Ring
.013”-.017”	Yamaha VX/FXHO Top Ring
.017”-.023”	Yamaha VX/FXHO Middle Ring
.004”-.014”	Yamaha VX/FXHO Oil Ring
.006”-.014”	Seadoo Top Ring/Middle Ring
.006”-.012”	Seadoo Oil Ring
.010”-.016”	Kawasaki Top Ring
.016”-.022”	Kawasaki Middle Ring
.016”-.023”	Kawasaki Oil Ring
.007”-.013”	Honda Top Ring
.016”-.022”	Honda Middle Ring
.010”-.030”	Honda Oil Ring

Table 3: Piston Arrow Direction
Make	Engine	Marking	Position
Seadoo	All	Arrow	Towards exhaust
Kawasaki	All (except 4-stroke)	Arrow	Towards Exhaust
Kawasaki	4-strokes	Dot	Towards exhaust
Polaris	650, 750, 780	Arrow	Towards front
Polaris	700, 900, 1050	Arrow	Towards exhaust
Yamaha	500	“UP”	Towards front
Yamaha	All others	Arrow	Towards exhaust
Tigershark	640, 1000	Arrow	Towards exhaust
Tigershark	770, 900	Dot	Towards exhaust
Honda	4-strokes	In	On the intake side