Top Performances TOP PERFORMANCE Cylinder Kit ø 49,5 for Maxi Kit Racing P/N. 9921450 (stroke 44 mm) Cylinder-piston kitRef : TPF00180A / 1127342

Racing piston-cylinder unit ?˜ 49.5 for Maxi Kit 85cc. Part no. 9921760

Warning: Only fit together with crankshaft Part no. 9920410 !!!

Scope of delivery:

1 Cylinder ?˜ 49.5 mm in special ?€œMINACROM?€ cast iron (with chrome additive)

1 Piston ?˜ 49.5 with high silicon content?

1 Chrome-plated steel piston ring 1 mm thick?

1 Piston gudgeon pin ?˜ 12 x 42 mm?

1 Roller bearing for gudgeon pin ?˜ 12 x 15 x 15 mm?

2 Gudgeon pin circlips?

1 Combustion chamber?

1 Combustion chamber cover?

8 O-ring ?˜ 7.66 x 1.78 in Viton, green?

1 O-ring ?˜ 53.7 x 1.78 in Viton, green?

1 O-ring ?˜ 22.22 x 2.62 in Viton, green?

1 O-ring ?˜ 28.24 x 2.62 in Viton, green?

1 O-ring ?˜ 104.37 x 3.54?

1 Reduction for temperature sensor?

1 Plug M14 x 1.25?

1 Aluminium gasket for plug M14 x 1.25?

1 Cylinder base gasket 0.5 mm?

1 Reduction bushing for exhaust from ?˜ 28 to ?˜ 25 mm

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• Bore: 49.5 mm
• Stroke: 44 mm
• Displacement: 85 cc.
• Squish: 0.9 ± 0.1
• Timing diagram: exhaust: 191° / transfer ports: 132°
• Compression ratio: geometric: 14.7:1 / actual: 8:1
• Recommended spark advance: 17° (1 mm before TDC)

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