Ryan Lawnaire IV Aerator (Pricing & Specs)
The Ryan Lawnaire IV is a 19.5-inch walk-behind core aerator built to remove soil plugs from turf. Its listed maximum core depth is 2.5 inches, with a 4.5-by-6-inch tine pattern. Many machines use a Honda GX120 four-cycle engine, but year and equipment condition matter. There is no dependable single price: request a written quote for the exact model and serial number.
A used aerator can look ready for work while hiding worn tines, drive trouble, or an engine that needs service. I recommend checking the machine itself, not relying on a model name or seller description alone. The details below help you confirm what you are pricing, compare equipment fairly, and prepare for a safe job.
Ryan Lawnaire IV specifications and model identification
The Lawnaire IV is a dedicated, walk-behind turf core aerator. It is not a lawn overseeder or a tow-behind aerator. Before buying or servicing one, match its model and serial information to the machine’s labels and manual; specifications and installed parts can differ by production year or prior repair.
| Specification | Listed information | What to check |
|---|---|---|
| Working width | 19.5 in. | Confirm against the machine’s identification and manual |
| Maximum core depth | Up to 2.5 in. under suitable conditions | Soil moisture, turf, and machine condition affect actual results |
| Tine pattern | 4.5 × 6 in. spacing | Verify the installed tine setup and condition |
| Engine | Honda GX120, four-cycle, approximately 118 cc | Read the installed engine label; do not assume every year has the same configuration |
| Machine type | Walk-behind core aerator | Make sure the listing is not for another Lawnaire model |
“Core aeration” means pulling small plugs of soil from the lawn. The openings can help relieve compacted turf, while the plugs left on the surface break down over time. This is different from making small holes without removing soil, and it is also different from spreading seed.
The 2.5-inch figure is a maximum under suitable soil and operating conditions, not a promise that every pass will reach that depth. Hard, dry ground may limit penetration; saturated ground can make operation difficult and leave poor results. Compare machines by the stated specification, then judge performance by condition and site.
Pricing, used-machine value, and what to compare
There is no single dependable current price for every Lawnaire IV. Asking prices and dealer quotes can vary with model year, condition, included equipment, and local inventory. For a useful comparison, get a written quote for the exact unit and compare it with another machine only after checking its engine, tine assembly, drive, and parts support.
Ask the seller or dealer to include these details in writing:
- Exact model and serial number
- Engine make and model shown on the engine label
- Sale price, taxes, delivery, and any setup charges
- Whether the machine has been inspected or serviced
- Known faults, missing guards, or non-original parts
- What warranty, if any, applies to that specific sale
- Availability and estimated cost of needed repair parts
For a used machine, price the repair risk as well as the asking price. Tines that are worn, damaged, or uneven can affect work quality and may mean added cost. A motor that starts is not proof that the drive and aerating parts work properly. Ask to see the machine run, and inspect it only when it is stopped and safe to approach.
| Buying situation | What may make it a reasonable choice | What to verify before agreeing |
|---|---|---|
| New dealer unit | Known configuration and a clear sales record | Exact model, included items, quote terms, warranty, and parts support |
| Used unit described as ready to work | Lower initial price may suit a tight budget | Tines, drive operation, controls, guards, leaks, engine label, and service history |
| Used unit needing repair | May suit a buyer able to source parts and arrange service | Written repair estimate, parts availability, and whether total cost still makes sense |
| Unclear or incomplete listing | May be worth inspecting if the seller can answer questions | Serial and engine labels, operating demonstration, and a complete condition report |
Do not compare a low asking price with a new quote until you know what the used machine needs. If parts availability is uncertain, ask a dealer or service shop to check the model and serial number before purchase. That step can prevent an attractive price from turning into a machine that sits through the season.
Equipment Setup and Safety Preparation
A careful setup helps protect the operator, turf, and buried services. Before starting, inspect the machine and the work area, and follow the instructions for the exact aerator and engine. If a guard, control, fastener, or safety feature is damaged or missing, do not treat the machine as ready for work until it has been checked and repaired.
Wear eye protection, hearing protection, and sturdy footwear. Keep other people clear of the operating area, and make sure you understand the controls before engaging the aerating mechanism. Inspect the tines, guards, fasteners, and controls for damage or looseness. Check engine oil as described in the engine manual.
Walk the full route before aerating. Mark sprinkler lines, lighting cables, shallow pipes, and other known hazards. Visual inspection alone cannot locate buried utilities. Use the appropriate utility-locating service or site records before work, and do not begin where the location of a service is uncertain.
Engine fuel and oil
The GX120 is a four-cycle engine, not a two-cycle engine. Do not mix two-cycle oil into its gasoline. Use the fuel and crankcase oil specified on the installed engine label and in the matching Honda manual; confirm the engine model before buying supplies, since the machine’s configuration may vary by year.
Field Aeration and Turf Conditions
Good core removal depends on soil and site conditions as much as on the machine’s rated depth. Work when the ground is moist enough for the tines to pull clean plugs, but not saturated. If the tines cannot penetrate, or the machine slips, clogs, or behaves abnormally, stop and reassess rather than forcing the pass.
Start and operate the aerator according to its manual. Move at a controlled walking pace and make overlapping passes where the job requires fuller coverage. The 4.5-by-6-inch tine pattern describes the spacing, but actual coverage also depends on how you lay out passes and the condition of the turf.
Avoid aerating frozen ground. Do not aerate saturated ground, where the soil can smear and machine movement may be difficult to control. Before work, clear loose debris and keep people away from the route. Stop if a tine strikes an obstruction or the machine suddenly moves or runs differently.
Illustrative site checks
These examples are decision guides, not reports of specific jobs. They show how soil and site conditions can change whether it is sensible to proceed.
- Dry, firm lawn: Check whether the tines can enter the soil cleanly. If they cannot, postpone work until moisture is suitable rather than trying to force depth.
- Wet lawn after rain: Check for standing water, soft footing, and soil that sticks or smears. If the ground is saturated, wait.
- Lawn with irrigation: Confirm utility locations and mark the route before operating. If a line’s location is uncertain, do not aerate that area.
- Tine hits an object: Disengage and stop the machine. Inspect only after it is shut down; identify the cause and check for damage before deciding whether to continue.
A buried irrigation line or cable can be damaged by a tine strike, and the impact can also cause sudden machine movement. Never rely on the absence of visible signs to assume an area is clear. If you cannot confirm a safe route, leave that section unaerated until it is checked.
Maintenance, Tine Inspection, and Engine Service
Routine checks help reveal wear before it interrupts a job. Inspect the tines, guards, fasteners, and controls before use, and clean soil and debris from the machine after work. Follow the correct manuals for adjustments and service intervals; do not guess at a setting or substitute a part based only on appearance.
Check tines for bending, cracks, excessive wear, or uneven condition. Damaged or mismatched tines may affect how the aerator works. If a tine is loose or damaged, stop using the machine and consult the service information for the proper repair. Do not reach near the tines while the machine is running or engaged.
Engine service should follow the manual for the installed engine. Check oil as directed, use the specified fuel, and look for leaks or loose components. If the machine will not start, runs unevenly, or has a drive problem, separate engine symptoms from aerator symptoms before replacing parts. A service shop can use the serial and engine labels to identify the correct parts and instructions.
After any tine strike, inspect the tines and nearby parts once the machine is shut down. If you find damage or cannot explain a change in operation, do not resume until the cause is resolved. A quick stop and inspection is safer than continuing with a damaged machine.
Storage and Seasonal Care
Seasonal storage is a chance to leave the machine clean, inspected, and easier to prepare for the next job. Shut it down, allow hot parts to cool, and remove soil and debris from the tines. Use the engine and machine manuals for storage steps, including fuel handling, rather than applying a general procedure to every model year.
Before storing, look for damaged tines, loose fasteners, worn controls, or leaks that need attention. Record the model, serial number, engine label information, and any needed repairs. These details make it easier to request the right parts or a useful dealer quote later.
Keep the aerator in a dry, secure location and follow the manufacturer’s storage instructions. Before the next season, inspect it again rather than assuming last year’s condition remains safe. Check the engine oil and controls, and verify that guards and fasteners are in place before starting.
Frequently asked questions
These quick answers cover the most common buying and operating questions about the Lawnaire IV. Always confirm the installed machine and engine details on their labels and in the matching manuals, since specifications and equipment can vary across years and individual units.
What is the working width of a Ryan Lawnaire IV?
The listed working width is 19.5 inches. Confirm the specification for the exact model and serial number before purchase.
How deep can the Lawnaire IV aerate?
Its listed maximum core depth is 2.5 inches under suitable soil and operating conditions. Actual depth can vary with soil moisture and machine condition.
What tine spacing does it use?
The listed tine pattern is 4.5 by 6 inches. Check the installed setup if the machine has been repaired or modified.
What engine is on a Lawnaire IV?
A Honda GX120 four-cycle engine, approximately 118 cc, is a listed configuration. Read the installed engine label because equipment may vary by year.
Does the GX120 use two-cycle fuel mix?
No. It is a four-cycle engine. Do not mix two-cycle oil into the gasoline; follow the engine label and matching manual for fuel and crankcase oil.
How much does a Ryan Lawnaire IV cost?
There is no single dependable current price across years, conditions, and dealer inventory. Request a written quote for the exact unit, including fees and condition details.
What should I inspect on a used aerator?
Check tines, guards, fasteners, controls, drive operation, engine label, and signs of damage or leaks. Ask for an operating demonstration and service history when available.
Can I use it on wet or frozen ground?
Do not aerate saturated or frozen ground. Wait for suitable moisture so the machine can work without forcing penetration or smearing wet soil.
What should I do if a tine hits something?
Disengage and stop the machine. Inspect it only after shutdown, identify the obstruction, and check for damage before deciding whether it is safe to continue.
How can I confirm buried irrigation lines are clear?
Locate and mark buried services before work using appropriate utility information or locating services. Visual inspection alone is not enough.
Is the Lawnaire IV a tow-behind aerator?
No. It is a walk-behind core aerator. Confirm the model label when reviewing a listing, since product names and descriptions can be confused.
What details should I give a dealer when asking about parts?
Provide the aerator’s model and serial number, plus the engine make and model from its label. Those details help the dealer identify the correct configuration.
(This article was written by one of our staff writers, Harrison Croft. Visit our Meet the Team page.)
