S&S Cycle Forged Roller Rocker Arm Kit — 1.725:1 — Twin Cam / Big Twin

S&S's 1.725:1 forged roller rocker arms for Big Twins — the ratio bumps valve lift at the valve beyond what the cam alone delivers, with metered oiling and bronze bushings. S&S is upfront that the 1.725 ratio increases stress on cams, tappets, and pushrods, and recommends these for racing applications.

FITMENT

S&S fitment: 1999–2017 Harley-Davidson Big Twin models. In our 2014+ Touring catalog: 2014–2016 Twin Cam Touring models.

Not sure it fits your bike? Email info@norcalbaggersupply.com — email is the fastest way to reach us — and we'll confirm before you order. You can also call 916-626-9030 (Mon–Fri, 9 AM–5 PM PT).

SPECIFICATIONS

• Manufacturer: S&S Cycle — part number 900-4098A
• Forged roller rocker arm set — 2 front & 2 rear; ratio 1.725:1
• 8620 steel with metered oiling (S&S)
• S&S roller rocker arms are recommended for cams with more than .585 in. of lift (S&S)
• Adjustable pushrods must be used with S&S roller rocker arms to obtain proper valve clearance (S&S)
• Made in the USA

INSTALLATION

Rocker arm replacement is top-end work. S&S is explicit: adjustable pushrods must be used with S&S roller rocker arms to obtain proper valve clearance. Follow the S&S instruction sheet included in the box and your Harley-Davidson service manual. No official S&S install video is published for this part — installation is manual-only. Professional installation is recommended; email us for an install-partner referral.

QUESTIONS RIDERS ASK

What does the 1.725 ratio do?
It multiplies the cam's lift at the valve — a .585 in. cam acts bigger at the valve — but it also increases stress on the whole valvetrain. S&S recommends the 1.725 arms for racing, not street use; the 1.625:1 set (900-4065A) is the street choice.

Do I need anything else?
Adjustable pushrods are mandatory with S&S roller rockers to set valve clearance (S&S), and S&S recommends new rocker arm shafts for maximum performance and rocker life.