Sierra 18-8839-1 Spark Plug Wire Set for 90 and 115 HP Outboard Engines

The Sierra 18-8839-1 is a spark plug wire set engineered for 90 hp and 115 hp outboard engines, supplying the two 14 inch wires and two 16 inch wires needed for a complete tune-up on these motors. Each wire uses a stainless steel wound conductor paired with a mag/wire wound core, a design intended to deliver maximum voltage to the spark plug while suppressing radio frequency interference (RFI) and electromagnetic interference (EMI) that can disrupt sensitive onboard electronics. The wires are jacketed in silicone for high temperature protection at the cylinder head, and the distributor insulators are moisture-proof and molded to keep water out of the ignition circuit in a marine environment. A high-quality conductive center carrier reinforcement is built into each wire to maintain conductor integrity over time, and the terminals at the spark plug and distributor ends are corrosion-resistant stainless steel for consistent conductivity. The set is finished in white and is sold as a complete kit of four wires sized specifically for the 90 hp and 115 hp outboard applications. This wire set replaces a worn or cracked factory ignition wire set that can cause misfires, hard starting, or reduced power, restoring reliable spark delivery across all four (or six) cylinders as applicable to the outboard's ignition system.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-8839-1
• Product Type: Outboard Spark Plug Wire Set
• Fitment: 90 and 115 HP Outboard Engines
• Wire Configuration: Two 14 inch wires and two 16 inch wires
• Color: White
• Outer Material: Silicone
• Conductor Material: Stainless Steel
• Core Type: Mag/Wire wound core
• Item Dimensions: 10.25 x 7.25 x 2.75 inches
• Weight: 0.7 pounds
• UPC: 808282194642

Fitment

• 90 HP Outboard Engines
• 115 HP Outboard Engines

Frequently Asked Questions

What engines does the Sierra 18-8839-1 wire set fit? The Sierra 18-8839-1 is built specifically for 90 hp and 115 hp outboard engines and is not intended as a universal fit.

How many wires come in this set and what lengths are they? The set includes four wires total: two 14 inch wires and two 16 inch wires, sized to reach the correct cylinders on 90 hp and 115 hp outboard engines.

What is the wire conductor made of? Each wire in the 18-8839-1 set uses a stainless steel wound conductor combined with a mag/wire wound core for strong voltage delivery.

Will these wires cause radio or electronic interference? No. The mag/wire wound core construction in the 18-8839-1 set is designed to suppress radio frequency interference (RFI) and electromagnetic interference (EMI).

Is this wire set moisture resistant for marine use? Yes, the 18-8839-1 set has moisture-proof, molded distributor insulators designed to keep water out of the ignition circuit in a marine environment.

What material is used for the outer jacket of the wires? The wires are jacketed in silicone, which provides high temperature protection at the spark plug and cylinder head.

How much does the Sierra 18-8839-1 spark plug wire set weigh? This spark plug wire set weighs 0.7 pounds.

What color are the wires in this set? The Sierra 18-8839-1 wires are white.

Are the terminals on this wire set corrosion resistant? Yes, the spark plug and distributor terminals on the 18-8839-1 set are corrosion-resistant stainless steel for consistent conductivity.

Does this wire set fit 150 or 175 hp outboards? No, the 18-8839-1 is sized for 90 hp and 115 hp outboards; 150 hp and 175 hp outboards use a different wire set with longer wires.

What is the UPC for the Sierra 18-8839-1 wire set? The UPC for this spark plug wire set is 808282194642.

What symptoms indicate I need to replace my outboard's spark plug wires? Misfires, hard starting, or a noticeable loss of power on a 90 hp or 115 hp outboard can indicate cracked or degraded ignition wires, which the 18-8839-1 set is designed to replace.