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9 Inches Propeller Safety Guard for 9.9HP to 20HP Outboard Motors
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Fitment answer
Fits the exact models and ranges listed below
Match key: Propeller diameter decides the fit: this 9" cage encloses propellers up to 8.5" in diameter on a standard 9.9-20 HP gearcase, so measure the propeller rather than reading horsepower alone.
- Primary reference
- PG0090
- Product form
- Universal bolt-on propeller safety guard (two-piece cage)
- Size
- 9" nominal guard, propellers up to 8.5" diameter
Compatible Engine Models
Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.
Confirm your engine model/year in the table below. For Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.
Confirm your engine model/year in the table below. For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson Serial Number Guide.
Confirm your engine model/year in the table below. For Suzuki owners, You can review exploded diagrams here to verify part numbers: Suzuki Parts Diagrams & Catalog.
On a phone, each row stacks into a card.
| Brand | Model | Rated HP | Stroke | Notes |
|---|---|---|---|---|
| Mercury / Mariner | All 9.9-20 HP models | 9.9-20 | 2- & 4-Stroke | Standard gearcase. Big Foot and Command Thrust gearcases take a larger propeller and need the 11" guard. |
| Yamaha | All 9.9-20 HP models | 9.9-20 | 2- & 4-Stroke | Standard gearcase. High Thrust (T-series) runs an 11.75" class propeller and needs the 11" guard. |
| Johnson / Evinrude | All 9.9-20 HP models | 9.9-20 | 2- & 4-Stroke | Standard gearcase. High-thrust and sail-drive style propellers need the 11" guard. |
| Honda | All 9.9-20 HP models | 9.9-20 | 4-Stroke | Standard gearcase. Power Thrust (BFP) versions need the 11" guard. |
| Suzuki | All 9.9-20 HP models | 9.9-20 | 2- & 4-Stroke | Standard gearcase. The factory high-thrust 10" propeller option needs the 11" guard. |
| Tohatsu / Nissan | All 9.9-20 HP models | 9.9-20 | 2- & 4-Stroke | Standard gearcase. The high-thrust four-blade 10" propeller option needs the 11" guard. |
Year is not the primary fitment key. The guard clamps around the lower unit, so the deciding numbers are propeller diameter and gearcase type, not model year. Big Foot, Command Thrust, High Thrust and Power Thrust gearcases are outside this listing; those owners should move up to the 11" propeller safety guard.
Part Numbers & What You Get
On a phone, each row stacks into a card.
| Type | Full number | Relationship |
|---|---|---|
| Aftermarket cross-reference | PG0090 | Primary reference |
| Aftermarket cross-reference | NorthBoat 9" Propeller Safety Guard | Same 9" cage, same 8.5" propeller limit |
| Product identifier | 9" propeller safety guard, 9.9-20 HP | This listing |
This is a universal accessory, not an engine service part. It carries no engine-maker part number, and none is implied.
Package contents
- 1 x Propeller Guard (9" Yellow)
- 1 x Set of Mounting Hardware (stainless steel)
- 1 x Installation Instructions
Key Specifications
- Guard diameter
- 9" nominal
- Maximum propeller diameter
- 8.5"
- Housing material
- Rigid polypropylene
- Mounting interface
- Cavitation plate and skeg, bolted (drilling required)
- Hardware
- Stainless steel bolts and nuts
- Housing colour
- Safety Yellow
- Shipping weight
- 1.495 kg (3.3 lbs)
- Package dimensions
- 32 x 29 x 18 cm
- Fitting type
- Direct mount to outboard lower unit
Easy-to-Miss Differences
- Propeller diameter beats horsepower. Many standard 9.9-20 HP outboards leave the factory with a 9.2"-9.25" propeller, which is wider than the 8.5" this cage encloses. Measure blade tip to blade tip across the hub before ordering.
- Big-gearcase versions are excluded. Big Foot, Command Thrust, Yamaha High Thrust, Honda Power Thrust and the four-blade high-thrust propeller options run 9.25" to 11.75" propellers and require the 11" guard instead.
- Installation is permanent. The cage bolts through the cavitation plate and skeg, so the holes stay in the lower unit even after the guard is removed.
- Listed size and weight describe the shipping package. 32 x 29 x 18 cm and 1.495 kg are carton figures, not the moulded cage dimensions.
- A cage changes water flow. Boats fitted with a guard can lose some top speed, and propeller pitch or diameter may need rethinking for the same cruise RPM.
- Colour is functional. Safety Yellow is chosen for underwater visibility, not styling, which matters most on rental and family boats.
JLM Marine Advantage
More than 20 years of marine-parts manufacturing experience. This high-quality aftermarket replacement is engineered to meet or exceed applicable OEM specifications. Every unit is 100% inspected before release.
- Factory-direct pricing
- 365-day coverage for any product defects
- Technical support from the people who make the parts
Returns follow the published store policy: most new, unused items may be returned within 7 days of delivery, subject to our Returns Policy. A 20% processing/restocking fee may apply for returns that are not the result of our error, and original shipping charges are non-refundable.
Aftermarket product: Not a genuine Mercury, Yamaha, Johnson/Evinrude, Honda, Suzuki or Tohatsu part. Brand names and part numbers identify compatible applications only.
Installation Notes
Professional installation is recommended. The outline below covers the parts supplied in the box.
- Shut the engine down, tilt or remove the outboard so the lower unit is clear of the water, and isolate the ignition before working near the propeller.
- Bring the two cage halves around the lower unit, one section above the cavitation plate and one below the skeg, and centre them on the propeller.
- Rotate the propeller by hand so clearance is even all round, then mark the hole positions through the guard onto the cavitation plate and skeg.
- Remove the guard and drill the marked holes with a bit matched to the supplied stainless bolts.
- Refit both halves and draw the stainless bolts and nuts up evenly, working across the cavitation plate before the skeg fixing.
- Turn the propeller through a full revolution again to be sure nothing touches, then re-tighten the fasteners after the first outing.
Tightening figures are not published for this accessory, so follow the printed sheet in the box rather than a generic torque value.
FAQ
How do I know the 9" guard suits my outboard?
Measure your propeller diameter across the blade tips. Anything up to 8.5" fits inside this cage on a standard 9.9-20 HP gearcase. Wider propellers and all Big Foot, Command Thrust, High Thrust or Power Thrust gearcases need the 11" size.
What does the cage actually protect?
It puts a rigid barrier between the blades and anything alongside the lower unit, which reduces strike risk for swimmers and marine life and shields the propeller from rocks and submerged debris in shallow water.
Does fitting it require drilling?
Yes. The guard bolts to the cavitation plate and skeg, so holes are drilled in the lower unit. That makes it a permanent modification, which is why a dry, well-supported engine and careful marking matter.
Will the guard slow the boat down?
Any cage adds wetted area around the propeller, so a small loss of top speed is normal. Trim the engine correctly and, on planing hulls, reassess propeller pitch if cruise RPM shifts.
What is the guard made of?
The cage is moulded in rigid polypropylene in Safety Yellow for underwater visibility, and it ships with stainless steel mounting hardware for corrosion resistance in salt water.
Is this an OEM part?
No. It is an aftermarket universal accessory built to comparable-grade material standards, cross-referenced to PG0090 and the NorthBoat 9" guard. Engine brand names appear only to describe compatible applications.
My engine is a 25 HP or larger. What do I need?
Step up within the propeller safety guard range, where larger cages cover heavier gearcases and wider propellers.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
Parts Finder
Our database is currently being updated and expanded. More models, including Yamaha, Mercury, and Suzuki, are being verified and uploaded.
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