S&S CYCLE - 320-0621 - 131" Hot Set Up® Engine Performance Kit - '17-'25 Harley-Davidson Electra Glide Police FLHTPI, Softail Low Rider ST FXLRST
S&S Cycle's 131" Hot Set Up Engine Performance Kit bolts straight into '17-'25 Touring models running the stock 114" or 117" M8 engine with no machine work, thanks to an updated profile that eliminates frame and lifter block clearance issues. It retains the original engine serial number, matches factory powder-coat finishes, and keeps stock engine height, with a 131" cam cover badge included as the finishing touch. 107" Touring and Softail models need a crankcase split, component upgrades, and an aftermarket 4-5/8" stroker flywheel to reach 131" displacement.
Features
- Updated profile eliminates frame and lifter block clearance issues
- Original engine serial numbers are retained
- Powder coat finish matches factory finishes
- Retains stock engine height
- Includes 131" cam cover badge
- Bolts in with no machine work for '17-'25 Touring models equipped with standard factory 114" or 117" M8 engines that feature 4-5/8" stroke from the factory.
- Requires crankcase split and component upgrades to fit '17-'25 M8 Touring 107" models and '18-'25 Softail models.
- Specifically engineered for a 4-5/8" stroke. Must be paired with an aftermarket 4-5/8" stroker flywheel assembly to achieve 131" displacement on 107" and Softail models.
- Works with stock crankcases: Cylinder spigots are designed to slide into the original factory cases.
- Cylinders and pistons kit only, flywheel sold separately.
Specs
- Riding Style: Street
- Stroke Length: 4.625"
- Bore Size: 4.250"
- Type: Engine
- Color/Finish: Highlighted Fins
- Color/Finish: Wrinkle Black
- Compression Ratio: 11.0:1
- Units: Kit
- Product Name: Performance Kit
- Displacement: 131"
- Model: Hot Set Up®
Frequently Asked Questions - S&S CYCLE - 320-0621 - 131" Hot Set Up® Engine Performance Kit - '17-'25 Harley-Davidson Electra Glide Police FLHTPI, Softail Low Rider ST FXLRST
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.
