$1,995.95

S&S Cycle 66-84 BT 93in Standard Compression 3-5/8in Big Bore Cylinder & Piston Kit - Gloss Black
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S&S Cycle 93 in. Big Bore Cylinder Kits 91-9101

S&S Cycle 93 in. Big Bore Cylinder Kits 91-9101

SSY-91-9101

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Part Number: SSY-91-9101

Estimated Ship Date: Dec 17, 2026

$1,995.95

Estimated Ship Date: Dec 17, 2026 Would you rather pick it up?

Overview

Brand:
Manufacturer's Part Number:
91-9101
Part Type:
Product Line:
Summit Racing Part Number:
SSY-91-9101
Cylinder Included:
Yes
Pistons Included:
Yes
Piston Material:
Forged aluminum
Piston Rings Included:
Yes
Wrist Pin Included:
Yes
Wrist Pin Bearing Included:
No
Head Gaskets Included:
Yes
Base Gaskets Included:
Yes
Cam Chain Tensioner Gaskets Included:
No
Exhaust Gaskets Included:
Yes
Valve Cover Gaskets Included:
No
Quantity:
Sold as a kit.
Notes:
Kit features gloss black cylinders with a 3 5/8 in. bore, is for use with a 4 1/2 in. stroke crankshaft, and cases must be bored for installation.

S&S Cycle 93 in. Big Bore Cylinder Kits

S&S Cycle's 93 in. big bore cylinder kits can provide significant benefits by increasing engine displacement, resulting in noticeable gains in horsepower and torque, particularly in the low to mid-range powerband, making for a more powerful and responsive ride with improved acceleration, while often being considered a relatively easy bolt-on upgrade that doesn't require major engine modifications. The larger cylinder bore allows for more air and fuel to be ingested during each combustion cycle, leading to a substantial increase in horsepower and torque. With more power available, the motorcycle will accelerate quicker and more readily, especially in everyday riding situations. While there may be a slight decrease in fuel efficiency due to the increased displacement, it is often negligible compared to the performance gains. To maximize the benefits of a big bore kit, it is often recommended to upgrade other engine components like the camshaft and intake system to optimize airflow and further enhance performance. Depending on the specific big bore cylinder kit and your bike's engine configuration, proper tuning with a power commander or similar device may be necessary to ensure the engine runs efficiently with the increased displacement.

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