BlueStars 795259 792040 Air Cleaner Primer Base - For 122000 Model BS Engines Toro Lawn Mower - Replaces 224815 691753 792040 496116

What It Is

The BlueStars 795259/792040 Air Cleaner Primer Base is a replacement part for Briggs & Stratton 122000-series engines, commonly used on Toro walk-behind mowers. It mounts the air filter and houses the primer bulb that delivers fuel for cold starts.

Fitment & Compatibility

• Engines: Briggs & Stratton 122000, 124700, 126700, 127000, 128400, 128800 series (check engine model number stamped on valve cover or blower housing).
• OEM Crosses: Replaces Toro 224815, 691753; Briggs 792040, 496116, 795259.
• What to measure: The mounting hole spacing (center-to-center) should be about 2.5 inches. The base diameter is roughly 3 inches.
• Check your old part: If your original has a cracked base, missing primer bulb, or broken air filter tab, this will match.
• Not universal: Will not fit older Briggs flathead engines or non-122000 series models.

Key Things to Know

• Quality note: BlueStars is an aftermarket brand. Some users report the primer bulb is slightly stiffer than OEM, but it functions reliably for most.
• Installation: Easy—remove the old base (one screw or two, plus the air filter cover), transfer the foam pre-filter if needed, and snap the new base in. No special tools required.
• Common gotcha: The plastic mounting tabs can be brittle on old mowers. Use a small flathead screwdriver to gently pry the old base off without breaking the engine housing tabs.
• Primer bulb fit: Some units ship with the bulb not fully seated—press it firmly into the base until it clicks before installing.

Should You Buy It

If your Toro mower with a Briggs 122000-series engine needs a new air cleaner base or primer bulb, this is a solid budget choice. It’s fine for DIY repairs and casual use, but if you want exact OEM feel or run a commercial mower, spend a few dollars more for a genuine Briggs part.