If you want electric starting for a 9.9 HP outboard, first determine whether you need a complete conversion kit or a replacement starter motor. The listed options include a 4-stroke kit advertised for 9.9 HP engines and several starter motors for specific makes, years, and configurations. The electric start kit is best for buyers seeking components for a compatible 4-stroke motor; the Caltric, PWC Engine, and FQO starters are for owners matching an existing engine’s fitment. These are parts, not complete outboard motors.
| Product | Best For | Key Fitment Detail |
|---|---|---|
| Electric Start Kit | Potential 4-stroke conversion | Advertised for 9.8, 9.9, and 10 HP |
| Caltric Mercury Starter | Mercury owners | Listed 9.9 HP 4-strokes, 2005–2011 |
| PWC Engine Starter | Later Johnson/Evinrude owners | 9.9–15 HP, 1993 and up |
| FQO Starter | Older Mercury/Mariner owners | Listed 1980–2005 applications |
| Caltric Vintage Starter | Older Johnson/Evinrude owners | 9.9 HP models, 1974–1979 |
Electric Start Kit For 9.8–10 HP Four-Strokes
This kit is advertised as suitable for 9.8 HP, 9.9 HP, and 10 HP four-stroke outboard motors. Its listing says the parts align with reserved positions and that assembly involves matching clips and interfaces. It is the most direct choice here for a buyer looking for an electric-start kit rather than a standalone replacement starter motor.
Best for: Owners of a listed-size four-stroke motor who are investigating a conversion. Why selected: It is the only product in this group described as a kit for adding electric start. Confirm the exact engine make, model, year, and included components with the seller before ordering; the supplied details do not name specific compatible engine models.
Caltric Starter For Mercury 9.9 HP Four-Strokes
Caltric lists this starter for Mercury Marine 9.9 HP 4-stroke 12.8-cubic-inch models from 2005 through 2011. The stated applications include several 9.9EH and 9.9EL variants. The order includes one starter motor, and the listing also provides corresponding Mercury part numbers, including 50-803835T02 and 803835T02.
Best for: Mercury owners whose engine identification and original part number match the listed applications. It is also listed for certain Tohatsu 9.9 HP 2-stroke models from 1992–2003, among other applications. Why selected: Its fitment details identify specific years, engine types, and part numbers. Avoid choosing it based only on horsepower; verify the exact model and part number first.
PWC Engine Johnson/Evinrude 10-Tooth Starter
This starter is listed for Johnson and Evinrude 9.9–15 HP applications from 1993 and up. The product name identifies it as a 10-tooth starter and cites OEM numbers 586274 and 584613. The supplied description characterizes it as an OEM-style replacement built to meet or exceed OEM standards.
Best for: Johnson/Evinrude owners whose year, horsepower, starter tooth count, and OEM number match the listing. Why selected: The stated 9.9–15 HP range and 1993-up application make it a relevant replacement candidate for certain 9.9 HP engines. The fitment description is broad, so check the engine’s parts catalog or existing starter number before ordering.
FQO Starter For Mercury And Mariner Outboards
FQO lists this new starter for Mercury and Mariner outboards from 1980 through 2005, including 9.9 HP models. Its specifications are 12 volts, 0.4 kilowatts, counterclockwise rotation, and 10 teeth. The listing supplies a long set of replacement numbers, including 50-90983A1 and 50-893889T.
Best for: Owners of an older Mercury or Mariner engine who can confirm a matching application or replacement number. Why selected: It provides useful electrical, rotation, and tooth-count specifications alongside a broad year range. Do not assume every 9.9 HP engine from those years fits; check the original starter and engine details.
Caltric Starter For 1974–1979 Johnson/Evinrude
This Caltric replacement starter is listed for Evinrude and Johnson 10E 9.9 HP models from 1974 through 1979. The order includes one starter, and the listed replacement numbers are 5710 and 18-6434.
Best for: Owners of the specifically named vintage 10E models. Why selected: It targets a distinct early-year 9.9 HP application that differs from the later Johnson/Evinrude starter options. Its fitment is narrow; avoid selecting it for a different model or year without confirming the part number.
Buying Guide: How To Choose A 9.9 HP Electric Start Part
Do you need a conversion kit or a replacement starter?
A conversion kit is intended to supply components for adding electric start, while a starter motor replaces an existing starter. The listed electric-start kit is described for several 4-stroke horsepower classes, but the available details do not specify exact engine models or enumerate every included part. Confirm kit contents and engine fitment before buying. If the motor already has an electric-start system, identify the failed component and compare the starter part number.
Which engine details should you check?
- Make, model, and year: Starter fitment can vary even between engines with the same horsepower.
- Engine type: Check whether the listing specifies a 2-stroke or 4-stroke application.
- Part number: Compare the existing starter’s number with the replacement numbers in the listing.
- Starter specifications: Where provided, compare voltage, rotation, and tooth count.
- Mounting details: Verify mounting arrangement and hardware requirements against the engine.
How should you compare these options?
Start with exact model-year fitment, not the broad 9.9 HP label. The Caltric Mercury listing gives detailed model-year and part-number information; the FQO listing adds voltage, power, rotation, and tooth count. The PWC Engine option identifies a 10-tooth design and OEM numbers for listed Johnson/Evinrude applications. For a vintage engine, the narrow year-specific Caltric listing may be more relevant than a newer broad-range starter.
Frequently Asked Questions
Are these complete 9.9 HP outboard motors?
No. The products listed are starter motors or an electric-start kit, not complete outboard engines.
Can I choose a starter based only on 9.9 HP?
No. Confirm the engine make, model, year, engine type, and replacement part number because fitment varies.
Is the electric-start kit confirmed for every 9.9 HP outboard?
No. It is advertised for 9.8, 9.9, and 10 HP four-stroke motors, but the supplied details do not identify every compatible engine model.
What does a 10-tooth starter specification mean?
It describes the starter’s gear tooth count. Compare it with the original starter and the application requirements rather than assuming it fits every engine.
What should I do if I cannot find my engine’s part number?
Use the engine identification information to consult the manufacturer’s parts catalog or a marine service professional before ordering.