Sierra 18-5011 Tune Up Kit, Replaces 172521, for Johnson/Evinrude Outboard Motors

The Sierra 18-5011 Tune Up Kit is a breaker-point ignition service kit for Johnson/Evinrude outboard motors, built to bring points-and-condenser ignition systems back to factory-correct operation. The kit is centered on a contact (points) set and a matching condenser, the two wear items that most commonly cause hard starting, misfiring, or a rough idle as an outboard's ignition ages. Sierra manufactures the kit to meet or exceed original equipment quality, and it is designed as a direct equivalent to the OEM tune-up kit these engines originally shipped with, so it drops into the same ignition service points without modification.

Inside the kit you get a contact set and a Sierra 18-5199 condenser, letting you replace both critical ignition wear parts in a single service instead of sourcing them separately. This keeps the ignition timing and dwell consistent with OEM specifications, which is important for reliable spark and smooth running on points-type Johnson/Evinrude outboards. The components are made of a plastic, metal, and composite construction consistent with OEM points-and-condenser hardware, and the kit is packaged as a complete 1-count service unit ready for installation.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5011
• Product Type: Tune-Up Kit (Contact Set and Condenser)
• Replaces (OEM): 172521
• Contains: Contact Set (O.E.# 580148, Qty 2); Condenser, Sierra 18-5199 (O.E.# 580321, Qty 1)
• Weight: 0.09 pounds
• Material: Plastic, Metal, Composite
• Color: White
• Fuel Type: Gasoline
• Recommended Use: Outboard Motor Maintenance and Repair
• UPC: 808282259273

Fitment

The Sierra 18-5011 Tune Up Kit is designed for Johnson/Evinrude outboard motors using breaker-point ignition components that match OEM part 172521.

Replaces (OEM)

• 172521

Frequently Asked Questions

What does the Sierra 18-5011 Tune Up Kit include? The kit includes a contact (points) set and a Sierra 18-5199 condenser, the two core ignition wear items needed for a breaker-point tune-up on a Johnson/Evinrude outboard.

What OEM part number does the 18-5011 kit replace? Sierra 18-5011 replaces OEM part number 172521.

Will this kit fit any outboard motor? No, the Sierra 18-5011 Tune Up Kit is designed specifically for Johnson/Evinrude outboard motors that use breaker-point ignition systems; always confirm the original part matches 172521 before ordering.

How much does the Sierra 18-5011 Tune Up Kit weigh? It weighs 0.09 pounds.

Is the condenser included the same as buying it separately? Yes, the condenser packaged in the 18-5011 kit is the Sierra 18-5199 condenser (O.E.# 580321), the same part sold on its own.

What is the quantity of contact points in the kit? The contact set portion of the 18-5011 kit is supplied in a quantity of 2 (O.E.# 580148).

What material are the tune-up kit components made from? The Sierra 18-5011 components are made of plastic, metal, and composite materials, consistent with standard points-and-condenser ignition hardware.

Is Sierra 18-5011 a genuine Sierra part or aftermarket equivalent? It is a Sierra-manufactured tune-up kit built to meet or exceed original equipment quality as a direct equivalent to OEM part 172521, not a rebranded OEM part.

What symptoms indicate I need this tune-up kit? Hard starting, misfiring, or a rough idle on a points-type Johnson/Evinrude outboard often point to worn contact points or a failing condenser, the two items replaced by the Sierra 18-5011 kit.

How many pieces come in the Sierra 18-5011 kit? The kit is sold as a single 1-count tune-up kit containing the contact set and condenser components needed for the service.