{"product_id":"sierra-18-99170-power-pack-kit-johnson-evinrude-v4","title":"Sierra 18-99170 Power Pack Kit, Johnson\/Evinrude 80-115 HP V4","description":"\u003cp class=\"nvn-hero\"\u003eThe Sierra 18-99170 is a complete ignition power pack kit for 1995 to 2006 Johnson and Evinrude 60-degree V4 outboards, covering the 80 Jet, 90, 100, 105, and 115 HP engines. It bundles the ignition system, the optical sensor, and a fresh spark plug so you fix a tired ignition once and get back to starting on the first crank.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eChasing a no-start, a rough idle, or a motor that suddenly won't climb past a certain RPM? On a 60-degree Johnson or Evinrude V4, the ignition power pack is one of the first things a good tech pulls into question. The Sierra 18-99170 is a complete power pack kit for the 1995 to 2006 four-cylinder engines, and it bundles the parts that tend to age out together so you're not fixing this motor twice.\u003c\/p\u003e\n\u003cp\u003eThis kit covers a wide slice of the 60-degree lineup. It fits the 80 Jet, 90, 100, 105 Commercial, and 115 HP models built from 1995 through 2006, all 4-cylinder, all with the 6400 RPM limit and the Quick Start and Speed Limiting Optimal Warning circuits. If your engine is a 90-degree block, this isn't your part. These are the loop-charged 60-degree powerheads, and the ignition timing is specific to them. Check the model year and the degree of the block against your engine before you order, because a pack that's close but not exact will fight you the whole install and never run right.\u003c\/p\u003e\n\u003cp\u003eHere's what's in the box. You get the ignition system itself (18-99166), the brain that fires the coils and manages spark advance. You get the optical sensor (18-5884-1), which reads flywheel position and tells the pack when to fire. And you get a spark plug (18-8839-1) so you're starting the job with fresh ignition hardware instead of dropping fouled plugs back in. Buying them together saves you the second parts order most people end up placing anyway.\u003c\/p\u003e\n\u003cp\u003eThe Quick Start feature holds a higher spark advance for the first several seconds after a cold start, so the motor catches faster and settles into idle without you feathering the throttle. The Speed Limiting Optimal Warning system, the S.L.O.W. circuit, is the safety net. If the powerhead overheats or the oil system flags a problem, the pack pulls the engine down to a fast idle. It's annoying at the ramp, but it's the reason a lot of these blocks survive a cooling problem instead of cooking a piston.\u003c\/p\u003e\n\u003cp\u003eA couple of things worth knowing before you wrench. The optical sensor is the part that most often fails on these engines, usually from saltwater working its way in and corroding the connections, so it's smart to replace it while you're in there. Sensor alignment matters. A slight offset when you seat it can leave you with a no-start or an erratic tach, so take your time and set it right. It's also worth confirming the stator is healthy first, because a weak stator can mimic a bad pack and leave you thinking the new kit didn't fix anything.\u003c\/p\u003e\n\u003cp\u003eWhen you route the new harness, keep it clear of exhaust heat, especially on the jet drives where things run tight. Gap a fresh set of plugs at 0.030 inches and check your coils while the cowling is off. Sierra builds these to meet or exceed the original equipment part they replace, and the company supplies plenty of OEM engine builders, so the fit and the spark are what the powerhead expects.\u003c\/p\u003e\n\u003cp\u003eThis is a repair part, not an upgrade, and that's exactly the point. A tired power pack shows up as intermittent misfires, hard starts on a cold morning, or a motor that runs fine until it warms up and then stumbles. Swapping in a matched kit like this takes the guesswork out. You're not mixing a new sensor with an old pack and hoping they play nice. Everything in the 18-99170 is built to work together on the 60-degree V4, so once it's installed and timed, you can trust the ignition side and move on to the rest of your spring service. And if you're doing this yourself at the dock, it's a manageable afternoon job with basic hand tools and a service manual open beside you.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003eFits 1995-2006 Johnson\/Evinrude 60-degree V4 engines (80 Jet, 90, 100, 105 Commercial, 115 HP) so one kit covers a wide slice of the 4-cylinder loop-charged lineup\u003c\/li\u003e\n  \u003cli\u003e6400 RPM rev limiter protects the powerhead from over-revving when a prop ventilates or you jump on the throttle in rough water\u003c\/li\u003e\n  \u003cli\u003eQuick Start circuit holds elevated spark advance on cold starts, so the motor fires and idles sooner on a cold morning\u003c\/li\u003e\n  \u003cli\u003eSpeed Limiting Optimal Warning (S.L.O.W.) drops the engine to a fast idle on an overheat or oil fault, giving the powerhead a fighting chance before real damage\u003c\/li\u003e\n  \u003cli\u003eIncludes the ignition system (18-99166), the matched module that fires the coils and manages spark advance on the 60-degree block\u003c\/li\u003e\n  \u003cli\u003eIncludes the optical sensor (18-5884-1), the part that most often fails from saltwater corrosion on these engines\u003c\/li\u003e\n  \u003cli\u003eIncludes a spark plug (18-8839-1) so you start the job with fresh ignition hardware\u003c\/li\u003e\n  \u003cli\u003eMeets or exceeds the original equipment part it replaces, built for the heat and salt of real marine use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Sierra Marine reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhich engines does the Sierra 18-99170 fit?\u003c\/summary\u003e\n    \u003cp\u003eIt fits 1995 to 2006 Johnson and Evinrude 60-degree V4 4-cylinder outboards: the 80 Jet, 90, 100, 105 Commercial, and 115 HP models with the 6400 RPM limit, Quick Start, and Speed Limiting Optimal Warning system.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat comes in the kit?\u003c\/summary\u003e\n    \u003cp\u003eYou get the ignition system (18-99166), the optical sensor (18-5884-1), and a spark plug (18-8839-1). It's a complete power pack kit, not just the pack alone.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill this fit a 90-degree V4?\u003c\/summary\u003e\n    \u003cp\u003eNo. This kit is built for the 60-degree loop-charged blocks only. It won't swap onto a 90-degree V4 without an adapter, and the ignition timing is specific to the 60-degree engines, so match your powerhead before ordering.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eShould I check anything before I install it?\u003c\/summary\u003e\n    \u003cp\u003eYes. Confirm the stator is healthy first. A weak stator can mimic a bad power pack, and if you skip that check you can end up thinking the new kit didn't fix the problem when the real fault is upstream.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhy do these power packs usually fail?\u003c\/summary\u003e\n    \u003cp\u003eOn these engines the optical sensor is the common culprit. Saltwater works its way in and corrodes the connections, which is why replacing the sensor along with the pack is the smart move and why it's bundled in this kit.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAny tips for installing the optical sensor?\u003c\/summary\u003e\n    \u003cp\u003eAlignment is critical. A slight offset when you seat the sensor can leave you with a no-start or an erratic tach reading, so take your time and set it correctly rather than rushing it back together.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat does Quick Start and S.L.O.W. actually do?\u003c\/summary\u003e\n    \u003cp\u003eQuick Start holds a higher spark advance for the first few seconds after a cold start so the motor catches faster. S.L.O.W., the Speed Limiting Optimal Warning system, pulls the engine down to a fast idle if it overheats or the oil system flags a fault, which helps protect the powerhead.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat spark plug gap should I run?\u003c\/summary\u003e\n    \u003cp\u003eBoaters running these engines commonly gap a fresh set at 0.030 inches. It's a good idea to check your coils at the same time while the cowling is off.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhere should I route the harness?\u003c\/summary\u003e\n    \u003cp\u003eKeep the new harness clear of exhaust heat, especially on the jet drives where the engine bay runs tight. Heat over time is hard on ignition wiring, so route it away from hot surfaces.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this a genuine Sierra part?\u003c\/summary\u003e\n    \u003cp\u003eYes. Sierra builds these to meet or exceed the original equipment part they replace, and Sierra supplies OEM engine builders, so the fit and the spark are what the powerhead expects.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eSierra 18-99170 Power Pack Kit for Johnson\/Evinrude 80-115 HP 60-Degree V4 Outboards\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSierra Marine\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e18-99170\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e736983850485\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eEngine Brand Compatibility\u003c\/th\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eModel Years\u003c\/th\u003e\n\u003ctd\u003e1995 to 2006\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eHorsepower Range\u003c\/th\u003e\n\u003ctd\u003e80 Jet, 90, 100, 105 Commercial, 115 HP\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eEngine Configuration\u003c\/th\u003e\n\u003ctd\u003e60 Degree, 4 Cylinder\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eRPM Limit\u003c\/th\u003e\n\u003ctd\u003e6400 RPM\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eIgnition Features\u003c\/th\u003e\n\u003ctd\u003eQuick Start, Speed Limiting Optimal Warning (S.L.O.W.)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eIncluded Ignition System\u003c\/th\u003e\n\u003ctd\u003e18-99166\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eIncluded Optical Sensor\u003c\/th\u003e\n\u003ctd\u003e18-5884-1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eIncluded Spark Plug\u003c\/th\u003e\n\u003ctd\u003e18-8839-1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eKit Type\u003c\/th\u003e\n\u003ctd\u003ePower Pack Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Which engines does the Sierra 18-99170 fit?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It fits 1995 to 2006 Johnson and Evinrude 60-degree V4 4-cylinder outboards: the 80 Jet, 90, 100, 105 Commercial, and 115 HP models with the 6400 RPM limit, Quick Start, and Speed Limiting Optimal Warning system.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What comes in the kit?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"You get the ignition system (18-99166), the optical sensor (18-5884-1), and a spark plug (18-8839-1). It's a complete power pack kit, not just the pack alone.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Will this fit a 90-degree V4?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No. This kit is built for the 60-degree loop-charged blocks only. It won't swap onto a 90-degree V4 without an adapter, and the ignition timing is specific to the 60-degree engines, so match your powerhead before ordering.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Should I check anything before I install it?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. Confirm the stator is healthy first. A weak stator can mimic a bad power pack, and if you skip that check you can end up thinking the new kit didn't fix the problem when the real fault is upstream.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Why do these power packs usually fail?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"On these engines the optical sensor is the common culprit. Saltwater works its way in and corrodes the connections, which is why replacing the sensor along with the pack is the smart move and why it's bundled in this kit.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Any tips for installing the optical sensor?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Alignment is critical. A slight offset when you seat the sensor can leave you with a no-start or an erratic tach reading, so take your time and set it correctly rather than rushing it back together.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What does Quick Start and S.L.O.W. actually do?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Quick Start holds a higher spark advance for the first few seconds after a cold start so the motor catches faster. S.L.O.W., the Speed Limiting Optimal Warning system, pulls the engine down to a fast idle if it overheats or the oil system flags a fault, which helps protect the powerhead.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What spark plug gap should I run?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Boaters running these engines commonly gap a fresh set at 0.030 inches. It's a good idea to check your coils at the same time while the cowling is off.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Where should I route the harness?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Keep the new harness clear of exhaust heat, especially on the jet drives where the engine bay runs tight. Heat over time is hard on ignition wiring, so route it away from hot surfaces.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this a genuine Sierra part?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. Sierra builds these to meet or exceed the original equipment part they replace, and Sierra supplies OEM engine builders, so the fit and the spark are what the powerhead expects.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Sierra Marine","offers":[{"title":"Default Title","offer_id":44999033782365,"sku":"2007721","price":313.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_f72ec638-01cd-4af6-a9fa-be37012d3b47.png?v=1788693699","url":"https:\/\/nvnmarine.com\/products\/sierra-18-99170-power-pack-kit-johnson-evinrude-v4","provider":"NVN Marine","version":"1.0","type":"link"}