Ignitions and Electrical› Ignition Boxes and Components

SIERRAMARINE

RPM LIMITER, MERCURY

$116.32

SKU: S08C 18-99211

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Description

The Sierra 18-99211 is an RPM rev limiter designed for Mercury marine engines. This unit is specified for Mercury 2, 3, & 4 cylinder engines and has a 5200 RPM limit. It replaces several Mercury part numbers, including 821889A19, and also replaces CDI part number 144-1889-51. This rev limiter is manufactured by Sierra, a respected brand in marine engine components.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandSIERRAMARINE
Part NumberS08C 18-99211

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy