Carburetor for Toro TimeCutter Titan and Exmark Quest Radius Riding Mowers,Carb Replace OEM# 136-7842 136-7840 127-9289

What It Is

This is a complete replacement carburetor for select Toro TimeCutter Titan and Exmark Quest Radius zero-turn mowers. It controls the air-fuel mixture going into the engine and is a direct swap for failed, clogged, or worn-out OEM units.

Fitment & Compatibility

• OEM cross-reference: Replaces Toro/Exmark part numbers 136-7842, 136-7840, and 127-9289.
• Engine platform: Fits Kawasaki FX, FS, and FR series V-twin engines (typically 22–26 hp). Check your engine tag for these series numbers.
• Mower models: Toro TimeCutter Titan (SS4225, SS5000, MX5050, etc.) and Exmark Quest Radius (S/N 300,000+). Not for older Toro Z-Master or Exmark Lazer Z units.
• Deck size: No direct deck-size limit – compatibility is engine-dependent, not deck-dependent.
• What to measure: Gasket surface dimensions (roughly 2.5" x 3.5") and mounting bolt spacing (same as OEM). If your old carb has a different mounting flange pattern, this won’t fit.

Key Things to Know

• Quality: It’s an aftermarket unit, not OEM Toro. Most buyers report it runs well out of the box, but a few note minor adjustments needed (idle screw, air-fuel mix). Expect 80–90% of OEM longevity.
• Installation difficulty: Moderate. You’ll need to remove the air filter housing, disconnect fuel and choke lines, and swap over the old gaskets (buy new ones if yours are damaged). Plan 45–60 minutes.
• Common gotchas: The included gaskets may be thin or poor-fitting – reuse your original Toro gaskets if they’re in good shape. Also, the carb may arrive with shipping debris in the bowl; flush it with carb cleaner before installing.
• Tuning: After installation, you’ll likely need to adjust the idle speed screw (turn clockwise to raise idle) and possibly the air-fuel mixture screw (1.5–2 turns out from lightly seated is a safe starting point).

Should You Buy It

If your Toro or Exmark is surging, hard-starting, or won’t run at all and you’ve confirmed the carb is the culprit (not fuel lines, filter, or pump), this is a solid, budget-friendly replacement. It’s not for perfectionists who require OEM-only parts, but it works reliably for most homeowners and light commercial users. Skip it if you want a lifetime part or need warranty-backed OEM support.