SBT Piston & Ring Set for Sea-Doo 657/657X XP/GTX/SPX/Speedster/Sports - Watercraft Superstore

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SBT Piston & Ring Set for Sea-Doo 657/657X XP/GTX/SPX/Speedster/Sportster/Explorer



SBT Sea-Doo 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 Sea-Doo 657/657X 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. Please choose the size you need.

1994 Explorer
1995 Explorer
1996 Explorer
1997 Explorer
1994 GTX
1995 GTX
1994 Speedster
1995 Speedster
1995 Sportster
1994 SPX
1995 SPX
1993 XP
1994 XP
1994 XPI

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 oclock 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



2 Stroke



Kawasaki 440, 550, 650, 750, 900, 1100
Yamaha 500, 650, 701, 760, 1100, 1200


Yamaha 800, 1200pv, 1300


Seadoo 580, 650, 720, 800
Polaris 650, 750, 780, 900
Kawasaki 1200


Polaris 700, 1050 Seadoo 951, 800 RFI

4 Strokes


Seadoo 112 (N/A)


Seadoo 113 (S/C)


Yamaha 408, 410, 411


Kawasaki 213, 214


Honda 600, 601

Table 2: Ring End Gap



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



Yamaha FX Top Ring


Yamaha FX Middle Ring


Yamaha FX Oil Ring


Yamaha VX/FXHO Top Ring


Yamaha VX/FXHO Middle Ring


Yamaha VX/FXHO Oil Ring


Seadoo Top Ring/Middle Ring


Seadoo Oil Ring


Kawasaki Top Ring


Kawasaki Middle Ring


Kawasaki Oil Ring


Honda Top Ring


Honda Middle Ring


Honda Oil Ring

Table 3: Piston Arrow Direction










Towards exhaust


All (except 4-stroke)


Towards Exhaust




Towards exhaust


650, 750, 780


Towards front


700, 900, 1050


Towards exhaust




Towards front


All others


Towards exhaust


640, 1000


Towards exhaust


770, 900


Towards exhaust




On the intake side

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