S&S CYCLE - 91-7661 - 96” Sidewinder - 3.625” Big Bore - Stroker Kit - Wrinkle Black - Evolution Big Twin
The S&S CYCLE 91-7661 is a purpose-built performance kit designed and tested to perform correctly in the conditions and applications it was made for. Kit includes standard flywheel assembly, 3.625” Sidewinder® stroker big bore cylinder, 9.75:1 compression ratio pistons, rings and gaskets. Flywheel assembly is complete with S&S heavy duty connecting rods and mainshafts, head gaskets, base gaskets, and exhaust gaskets, giving you a level of quality that holds up across the full service life of the component. Makes stock 80” displacement into 96” displacement. Does not include manifold, pushrods, or pushrod clips.. '77-'89 style pinion gear and oil pump drive gears must be used when installing S&S flywheels in '90-'99 engines.. The 91-7661 delivers exactly what riders need from a quality aftermarket component. Sold as a complete kit.
Features
- Kit includes standard flywheel assembly, 3.625” Sidewinder® stroker big bore cylinder, 9.75:1 compression ratio pistons, rings and gaskets
- Flywheel assembly is complete with S&S heavy duty connecting rods and mainshafts, head gaskets, base gaskets, and exhaust gaskets
- Makes stock 80” displacement into 96” displacement
- Made In the USA
- Does not include manifold, pushrods, or pushrod clips.
- '77-'89 style pinion gear and oil pump drive gears must be used when installing S&S flywheels in '90-'99 engines.
- Cases must be bored to accept 3.625” bore cylinders, and a minor crankcase clearancing operation for the crankpin nut must be performed.
Specs
- Model: Sidewinder
- Color/Finish: Wrinkle Black
- Compression Ratio: 9.75:1
- Riding Style: Street
- Units: Kit
- Style: Big Bore
- Bore Size: 3.625”
- Displacement: 96”
- Stroke Length: 4.625”
- Product Name: Performance Kit
- Type: Engine
Frequently Asked Questions - S&S CYCLE - 91-7661 - 96” Sidewinder - 3.625” Big Bore - Stroker Kit - Wrinkle Black - Evolution Big Twin
How do I know if this part fits my vehicle?
Check the fitment information listed on this page against your exact year, make, model, and (where applicable) trim, engine size, or configuration. If your exact vehicle isn't listed, or you're not sure, use the product chat on this page or contact our support team before ordering - we're glad to help confirm fitment.
What does it mean if a product is listed as universal fit?
Universal fit means the product is designed to work across a range of vehicles, not that it's guaranteed to fit every one. Compare the listed measurements, mounting requirements, and connector or hardware specs against your specific vehicle before ordering, since some installations may need additional hardware or minor fabrication.
Where can I find installation instructions for this product?
General installation notes are provided above where available. For detailed step-by-step instructions, refer to the manufacturer's documentation included with the product, or use the product chat on this page for questions about difficulty, required tools, or whether professional installation is recommended.
What if I have more questions about this product?
Use the product chat on this page for fitment, specs, installation, and compatibility questions, or contact our support team directly for help before you order.
