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S&S CYCLE Big Bore Cylinder and Stroker Piston Kit 91-9001

Part Number: 09310690
S&S CYCLE
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SKU:
09310690
MPN:
91-9001
Condition:
New
Availability:
Ships Same Business Day
Weight:
32.30 LBS
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MSRP: $1,995.95
Now: $1,796.36
Was: $1,995.95
— You save $199.59
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Description

Building or rebuilding a big-bore Harley engine demands precision components that can handle sustained high RPM and boost. This S&S Cycle kit delivers the bore and stroke combination you need to unlock serious displacement gains—whether you're starting from scratch or upgrading an existing stroker foundation. You get everything required for a complete cylinder and piston assembly, all manufactured to S&S's exacting standards and made right here in the USA.

  • 3-5/8" bore cylinders
  • High tensile cast iron
  • Forged pistons included
  • Rings and wristpins
  • 88 cubic inches
  • 7.5:1 compression ratio
  • Head gaskets included
  • Stainless steel head bolts
  • Washers and base nuts
  • Base gaskets included
  • 4-1/4" flywheel compatible
  • Bolt-on installation
  • Made in USA
  • MPN: 91-9001
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Specs

DISPLACEMENT:
88'
MATERIAL:
IRON
STROKE LENGTH IMPERIAL:
4.250'
PRODUCT NAME:
CYLINDER AND PISTON KIT
COLOR/FINISH:
GLOSS BLACK
COMPRESSION RATIO IMPERIAL:
7.5:1
STYLE:
BIG BORE
UNITS:
KIT
BORE SIZE IMPERIAL:
3.625'
MATERIAL:
CAST
RIDING STYLE:
STREET
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Big Power, Nice Sound!

Picked up a Pro Circuit pipe and silencer for my YZ125 it’s a game changer. The power feels way better and the sound is awesome.

Tyler D. - 06/12

Perfect Fit

First time ordering here and dang y’all knocked it outta the park! The wheels fit my Ranger UTV perfect, and I’ll definitely be back for more 5 stars all day!

Sarah L. - 08/24

Fast Shipping!!

Ordered on a Monday, and it was on my doorstep by Wednesday! Super impressed with how fast the shipping was.

Jason P. - 09/13

Helps keep cool, works great!

Bought the dual pass Allstar radiator for my build, and it’s been solid. Keeps the engine running cool even on the hottest days no complaints here!

Jake M. - 05/21

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