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S&S CYCLE Piston Kit 106-3690

Part Number: 09104209
S&S CYCLE
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SKU:
09104209
MPN:
106-3690
Condition:
New
Availability:
Ships Same Business Day
Weight:
2.65 LBS
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MSRP: $514.95
Now: $463.46
Was: $514.95
— You save $51.49
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Description

If you're running a stock 883cc or 1200cc Big Twin, you're leaving significant power on the table. The S&S CYCLE Piston Kit 106-3690 bumps displacement to 1250cc while maintaining reliable 10.3:1 compression, delivering a straightforward path to increased displacement without major engine architecture changes. This is a proven, bolt-on upgrade that works with both stock and performance heads—giving you measurable performance gains on the dyno and the street.

  • Displacement: 1250cc
  • Compression ratio: 10.3:1
  • Piston design: Cast flat-topped
  • Bore size: 3-9/16"
  • Fitment: 1984–'99 HD Big Twins
  • Compatible cylinders: Stock 1200cc, 1986–'2003 883cc (bored)
  • Head compatibility: Stock heads supported
  • Recommended: S&S CNC ported heads
  • Installation: Requires cylinder boring
  • Not compatible: 2004–'16 883cc cylinders
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Specs

BORE SIZE IMPERIAL:
3.927'
PRODUCT NAME:
PISTON KIT
STROKE LENGTH IMPERIAL:
4-3/8'
BORE - OVERSIZE:
STANDARD
BORE OVERSIZE - IMPERIAL:
STANDARD
COMPRESSION RATIO IMPERIAL:
10.0:1
PISTON MATERIAL:
FORGED
RIDING STYLE:
STREET
DISPLACEMENT:
106'
PISTON HEAD SHAPE:
FLAT TOP
TYPE:
REPLACEMENT
UNITS:
KIT
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Fitment for S&S CYCLE Piston Kit 106-3690

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