Kawasaki FX-Series Cross-Reference: Filters, Plugs & Oil

The Kawasaki FX series is the heavy-hitter of the family; the big-block commercial engine you find on the larger zero-turns and the machines that mow for a living. It shares the family DNA: the same spark plug, the same oil, the same fuel filter across the whole line. Where the FX earns its own guide is the air filter. Several FX engines run a two-piece canister with an inner and outer element, a couple can be built two different ways, and the oil filter steps up partway through the line. Get the engine model and spec number right and every one of these parts falls into place. Here it is from the parts counter, top to bottom.

Full FX-Series Cross-Reference Table

*Capacities are approximate, assume a full oil filter, and are the amount needed at an oil-and-filter change — always verify on the dipstick. †Oil filter 49065-0734 crosses to Rotary SE-1. ‡The FX801V, FX921V and FX1000V can be built with either the standard canister (11013-7044 + 11013-7045) or a tapered-inner system (11013-7038 + 11013-7039). Confirm by spec number. Spark plug 92070-7004 = NGK BPR4ES.

Why Two of the “Same” Engine Take Different Parts

This is the part that trips up even good counter people. Kawasaki builds one base engine, an FX801V say, to dozens of different spec (code) numbers. A mower brand like Cub Cadet, Exmark, Bad Boy or Scag can order that engine built to their preference: with the standard canister air filter or the tapered-inner version. They’re all stamped “FX801V,” but the air-filter parts list isn’t identical.

Standard parts diagrams default to the base model. So if you order by engine model alone or a counterperson looks it up without your spec number you can walk out with an air filter that doesn’t seat in your housing. The fix is simple: pull the spec/code number off the engine label (it’s a separate line from the model, often after a dash or labeled “CODE”) and match to that. This same spec-number variation runs across the FR, FS and FX families. It’s not unique to one engine.

Air Filters 11013-7048 / 7044+7045 / 7038+7039

The air filter is the one part that genuinely changes across the FX line, so it’s worth knowing the three setups before you order.

Single round filter — FX481V, FX541V, FX600V

The smallest FX engines use one round filter: Kawasaki 11013-7048. Aftermarket crosses are Rotary 11842 and Stens 100-533. The Rotary and Kawasaki interchange freely; replace at least once a season, more often in dust, and tap it clean rather than blasting it with high-pressure air.

Check PriceKawasaki 11013-7048Check PriceRotary 11842Check PriceStens 100-533

Standard canister, outer + inner — FX651V through FX850V

From the FX651V up, most of the line uses a two-piece canister with an outer and a separate inner safety element. The outer is Kawasaki 11013-7044 (Rotary 11841, Stens 102-305); the inner is Kawasaki 11013-7045 (Rotary 11865, Stens 100-780). Replace the outer on schedule and inspect the inner each time. The inner is your last line of defense if the outer ever fails.

Check PriceKawasaki 11013-7044Check PriceKawasaki 11013-7045 (inner pair)Check PriceRotary 11841Check PriceStens 102-305

Check PriceKawasaki 11013-7045Check PriceKawasaki 11013-7044 (outer pair)Check PriceRotary 11865Check PriceStens 100-780

Tapered-inner option — FX801V, FX921V, FX1000V

The FX801V, FX921V and FX1000V can be built two ways. Some carry the standard 11013-7044 + 11013-7045 canister above; others use a system with a tapered inner filter. On that build the outer is Kawasaki 11013-7038 (Rotary 12786, Stens 100-656) and the inner is Kawasaki 11013-7039 (Rotary 12787, Stens 100-660). The Rotary and Kawasaki filters interchange. Stens uses their own design here. If you go Stens, plan on buying the inner and outer together so they seat as a matched set. This is exactly why the spec number matters: two FX1000V engines can take completely different air filters.

Check PriceKawasaki 11013-7038Check PriceKawasaki 11013-7039 (inner pair)Check PriceRotary 12786Check PriceStens 100-656

Check PriceKawasaki 11013-7039Check PriceKawasaki 11013-7038 (outer pair)Check PriceRotary 12787Check PriceStens 100-660

Spark Plugs 92070-7004 ×2

Same plug as the whole FR/FS/FX family, and each engine is a V-twin, so you need two. Kawasaki 92070-7004 is a re-branded NGK BPR4ES. The NGK off the shelf is the same plug. They come pre-gapped, so they install straight out of the box; replace both at once so the engine runs even.

Check PriceNGK BPR4ESCheck PriceKawasaki 92070-7004

Fuel Filter 49019-0031

The FX series uses Kawasaki fuel filter 49019-0031. It’s a couple-dollar part protecting a fuel system that costs a great deal more, so stay with a genuine Kawasaki filter or a quality equivalent rather than a cheap universal inline filter. Replace it once a season along with the rest of the tune-up parts.

Check PriceKawasaki 49019-0031

Oil Filter 49065-0736 / 49065-0734

The oil filter steps up partway through the line. The smaller FX engines like FX481V, FX541V, FX600V, FX651V, FX691V and FX730V use Kawasaki 49065-0736. The big-block engines from the FX751V up (751, 781, 801, 820, 850, 921, 1000) use Kawasaki 49065-0734, which crosses to Rotary SE-1. Change the filter with every oil change, and match it to your engine model. This is one more reason to confirm the spec number rather than guessing.

Check PriceKawasaki 49065-0736

Check PriceKawasaki 49065-0734Check PriceRotary SE-1

Check PriceRotary SE-1

Engine Oil 99969-6296 & Capacities

Every FX engine takes the same Kawasaki 99969-6296. Capacity is where they spread out, so buy by the engine:

• FX481V — ~1.8 qt (grab 2)
• FX651V — ~2.0 qt (grab 2)
• FX541V, FX600V, FX691V, FX781V/781A, FX801V, FX820V/820A, FX921V, FX1000V — ~2.1 qt (grab 3)
• FX730V, FX751V — ~2.2 qt (grab 3)
• FX850V — ~2.4 qt (grab 3)

Use the viscosity called out in your operator’s manual for your temperature range.

Check PriceKawasaki 99969-6296 oil

Quick Reference by Engine

FX-Series Parts FAQ