The 12 parts you should never run out of during spring rush

Last March 24th, a shop in Kentucky had 19 mowers on the floor waiting on blades. Not rare blades. Standard 21-inch mulching blades for MTD decks. Stens was out. Rotary was out. Oregon had backorder through April 18. He lost three weeks of tickets because he waited until February to place his spring order.

This happens every year. Your spring mower parts stock planning has to start in January, because distributor warehouses run dry by the third week of March. Here is the list we give every shop that asks what to commit to now.

The calendar you are fighting

Distributors build spring inventory in Q4 and early Q1. By late February, warehouse pulls outpace restocks. Late March is peak. First two weeks of April is crisis.

• January 1 to 20: distributors fully stocked, best prices
• January 20 to February 15: commitment window, some pre-buy discounts
• February 15 to March 15: spotty stockouts begin, regional variance
• March 15 to April 15: wide stockouts, 3 to 8 week backorders
• April 15 onward: recovery starts, spot orders only

Your February PO should be placed in the second week of January. That is the single most important sentence in this post.

The 12 parts to commit to in January

We have pulled this list from 200+ shops across eight states. These are the categories that stock out first and cost you the most when they do.

1. Air filter multi-packs for Briggs Intek, Honda GCV160, Kohler Courage, Kawasaki FR and FX series.
2. Spark plugs in RC12YC, DPR8EA-9, BKR5E, and CMR6H. Buy them in boxes of 100, not fours.
3. Carburetor kits for Briggs 550EX, Honda GCV160/190, Kohler Courage SV, and Tecumseh HSSK. These four cover 70 percent of your spring intake.
4. Mulching blades for 21-inch, 42-inch, and 48-inch decks in the top 6 hole patterns.
5. Starter ropes in 3.5mm, 4mm, and 5mm. A 100-foot roll in each size.
6. Primer bulbs for Tecumseh, MTD, and Ryobi-compatible fitments.
7. Fuel line and filter kits in 1/4-inch and 5/16-inch. Include Tygon tubing, not just cheap vinyl.
8. Engine oil in SAE 30 and 10W-30, case quantities.
9. PTO and deck belts for the 10 most common residential zero-turns and lawn tractors you service.
10. Wheel bearings and drive belts for self-propelled walk-behinds — Honda HRX, Toro 22-inch, Troy-Bilt TB series.
11. Battery packs for the top 3 lithium OEMs your customers bring in (EGO, Ryobi, DeWalt kits if you service those).
12. Ignition coils for Briggs 675, 725, and 850 series Intek engines. These are the biggest spring failure point.

Why each category stocks out

Shop owners ask us which parts they can skip. The honest answer is none of them, but here is what drives each stockout.

Part category	Primary failure mode	Why it stocks out
Air filters	Old filter, no off-season service	Every tune-up job, every shop
Spark plugs	Fouled from ethanol fuel sitting all winter	Same
Carb kits	Gummed bowls from stored fuel	70% of spring no-starts
Blades	Dull, bent, or missing from fall	Every homeowner calls in March
Starter ropes	Frayed from last season	Always a same-day repair
Primer bulbs	Cracked from UV and age	Easy job, high volume
Fuel line	Cracked, leaking, clogged	Ethanol damage is universal
Oil	Service intervals	Every tune-up
Deck belts	Stretched, cracked, missing	Big-ticket spring item
Drive belts	Self-propel failures	Walk-behind volume
Batteries	Winter discharge on lithium packs	Growing every year
Ignition coils	Briggs Intek design weakness	Known issue, guaranteed failures

The Briggs Intek coil is the one most shops underestimate. If you service 50 tractors a week in April, you will install 6 to 10 coils every week. Stock 30 coils in January.

How much to order

The rule of thumb that has held up for years: order 120 percent of what you used last spring, measured from March 1 to May 31. Pull your numbers from last year's invoices or your shop system.

If you are new and do not have the data yet, here is a starter kit sized for a 1 to 2 tech shop doing 40 to 60 tickets a week in season.

• Air filters: 300 units across top 8 fitments
• Spark plugs: 500 across top 4 fitments
• Carb kits: 60 across top 4 fitments
• Blades: 200 across top 6 fitments
• Starter ropes: 3 rolls per size
• Primer bulbs: 100 across top 3
• Fuel line: 200 feet each of 1/4 and 5/16
• Oil: 6 cases SAE 30, 4 cases 10W-30
• Deck belts: 50 across top 10 fitments
• Ignition coils: 30 Briggs Intek

That is about a $4,800 commitment at dealer pricing. You will sell it by Memorial Day.

Ordering across distributors, not from one

Do not put the whole order with one distributor. Split it. When Stens runs out of blades in late March, you still have Rotary inventory arriving.

A typical split we see work well:

• Stens: OEM-quality air filters, spark plugs, fuel line
• Rotary: blades, belts, wheels, primer bulbs
• Oregon: chainsaw and trimmer parts, mower blades backup
• OEM direct (Briggs, Kohler, Kawasaki): coils, carbs, anything under warranty

If your shop software tracks parts across multiple distributors in one search, use it. If it does not, build your own spreadsheet so you can see stock positions in one place.

Label your spring stock separately

This is the small habit that separates organized shops from chaotic ones. When your spring PO arrives, bin it on a clearly marked "Spring 2026" shelf or section. Tag every bin. Inventory it once a week from March 1 through May 31.

You want to know on a Tuesday in April, in 20 seconds, whether you have 14 Briggs coils or 4. You cannot run that shop on memory.

Bottom line

Your spring mower parts stock needs to be committed in the second week of January, not in February when you feel the rush coming. Split across distributors, size to 120 percent of last spring's consumption, and label it separately on the shelf. Do that once and you will never lose another three weeks waiting on blades.