Carburetor Carb Replacement For Craftsman 625 series Lawnmower, Craftsman 917376742, 6.5hp Craftsman mower, Craftsman mower model 917.378644 B & S model 128602-0259-E1.

What It Is

This is a carburetor replacement for Craftsman walk-behind mowers using the 625 series platform, specifically designed for models like the 917.376742 and 917.378644. It replaces the stock carburetor to fix starting issues, rough idling, or fuel delivery problems.

Fitment & Compatibility

Before buying, confirm your mower’s exact model number (found under the seat or on the frame). This carb fits Craftsman 625 series mowers with Briggs & Stratton engines, including model 128602-0259-E1. It is an aftermarket part, not OEM, so expect slight differences in gasket fit or fuel line orientation. Check that your mower has a 6.5hp engine and a 21-22 inch deck—measure the mounting bolt spacing (typically 2.5 inches center-to-center) and ensure your fuel line diameter matches (commonly 1/4 inch). Verify the carburetor’s bowl size and float design match your old unit.

Key Things to Know

• Quality: Aftermarket carburetors at this price point often work well but may need minor adjustments (e.g., float height or idle screw tuning) out of the box.
• Installation difficulty: Moderate—requires removing the air filter housing, fuel line, and throttle linkage. Have a small flathead screwdriver and pliers ready.
• Common gotchas: The included gaskets may be too thin or thick; reuse your old ones if they’re intact. The fuel line may be a tight fit—soak it in hot water to soften. Also, check that the choke linkage moves freely after installation.
• Performance: Most users report improved starting and smoother idle after install, but expect to clean out any debris from the packaging before mounting.

Should You Buy It

If your Craftsman 625 series mower is hard to start, stalls, or runs rough due to a clogged or failing carburetor, this is a cost-effective fix. It’s right for DIYers comfortable with basic engine work who want to avoid a $50+ OEM replacement. However, if your mower has other issues (e.g., bad valve seals or compression), this won’t solve them. For a quick, budget-friendly repair on a common platform, it’s a solid buy.