21445 Carburetor Kit Replacement For Toro Vortex 150cc Lawn Mower model# 21445 21442 21465 with Air Filter & Cover

What It Is

This is a complete carburetor replacement kit for Toro Vortex 150cc lawn mowers, including a pre-assembled carburetor, air filter, and air filter cover. It’s designed to restore fuel delivery and air filtration on models with the Briggs & Stratton 150cc engine that are running rough, stalling, or failing to start.

Fitment & Compatibility

Before buying, verify your mower’s model number (not just engine brand). This kit fits Toro models 21445, 21442, and 21465 specifically. The engine must be a Briggs & Stratton 150cc Vortex (typically with a plastic carburetor). Check your mower’s deck size—these models usually have 21” or 22” decks, but measure the mounting bolt spacing on your old carburetor (center-to-center of the two mounting studs) to confirm. OEM part numbers for reference are Toro 131-9540 or Briggs & Stratton 799871. This is an aftermarket kit, not genuine Toro or Briggs.

Key Things to Know

• Quality variance: Aftermarket carburetors may have slightly different jetting than OEM. Expect to adjust the idle mixture screw (if present) or clean out debris from shipping.
• Installation difficulty: Moderate. You’ll need to remove the old carburetor, transfer the throttle cable and linkage (use the old spring if provided one is weak), and reattach fuel lines. No special tools required beyond a socket set and screwdriver.
• Common gotcha: The air filter cover may not fit perfectly on all models. If it’s too tight, use the old cover instead. Also, check the fuel line for cracks—replace if needed to avoid air leaks.
• Primer bulb: If your mower has a primer bulb, ensure the kit includes one (this set does not always include it). You may need to reuse yours.

Should You Buy It

If your Toro Vortex 150cc mower is hard to start, runs rough, or won’t stay running, this kit is a cost-effective fix (around $20) that replaces the most common failure points. It’s best for DIYers comfortable with basic engine work—if you want a perfect OEM fit or have a different model number, stick with genuine Toro parts. For the price, it’s a solid value for getting a mower back in service.