S&S CYCLE - 310-1290 - MK136 Black Edition Engine - Oil Cooled - 49 State - M8 Touring
The S&S CYCLE 310-1290 is a purpose-built engine designed and tested to perform correctly in the conditions and applications it was made for. High-flow cylinder heads with premium seats, guides, valves, springs, and seals. +1.00 mm oversized intake and exhaust valves, giving you a level of quality that holds up across the full service life of the component. Valves are 0.030” longer than stock for improved valvetrain geometry. 0.605” max lift valve spring. 475G gear drive cam. For riders who know the difference quality components make, the 310-1290 is the right call. Sold individually.
Features
- Cylinder Heads:
- High-flow cylinder heads with premium seats, guides, valves, springs, and seals
- +1.00 mm oversized intake and exhaust valves
- Valves are 0.030” longer than stock for improved valvetrain geometry
- 0.605” max lift valve spring
- 475G gear drive cam
- Enlarged cooling passage around the exhaust seats
- S&S exclusive breather boxes
- Crankcase:
- Patented dual-spray piston cooling jets
- Precision machined oil scraper
- Enlarged oil sump
- Contoured floor allows oil to easily drain back to the sump
- MK136:
- Retains stock engine height
- Includes forged pistons, S&S performance oil pump and cam support plate, premiun tappets and tappet cuffs, billet aluminum covers, sprocket shaft spacer, Champion spark plugs and cam cover badge
Specs
- Color/Finish: Powder Coat
- Product Name: Engine
- Displacement: 136”
- Piston Material: Forged
- Color/Finish: Black
- Cooling System: Oil Cooled
- Riding Style: Street
- Units: Each
- Model: MK136
Frequently Asked Questions - S&S CYCLE - 310-1290 - MK136 Black Edition Engine - Oil Cooled - 49 State - M8 Touring
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.
