Craftsman Lawn Mower Carburetor Main Jet Replacement

Craftsman Lawn Mower Carburetor Main Jet Replacement Parts

Your Craftsman mower's carburetor main jet controls fuel mixture at full throttle—when it clogs or wears, you'll notice rough running, black smoke, or difficulty starting even after cleaning. Rather than spend hours soaking carburetors, a genuine OEM main jet swap often solves the problem in minutes. Repair Clinic stocks genuine Craftsman jets and complete carburetor assemblies so you can get back to mowing fast.

We carry both individual jets and full carburetors for Craftsman push and riding models. Need help identifying which part fits your machine? Enter your model number below—we'll match you to the exact part your engine needs.

• Carburetor won't start or runs rough – clogged or worn main jet restricts fuel flow
• Black exhaust smoke or excessive fuel smell – jet running too rich
• Mower surges or stalls under load – jet metering worn or damaged
• Hard cold starts but runs okay warm – jet partially blocked by varnish buildup

Browse our Craftsman Lawn Mower parts and find your model number on the deck or engine block to order the right replacement today.

Craftsman Lawn Mower Carburetor Main Jet Questions

What's the difference between a carburetor main jet and a pilot jet on my Craftsman?

The main jet controls fuel flow at high engine speeds and full throttle, while the pilot jet handles idle and low-speed running. If your Craftsman won't start or idles poorly, the pilot is usually the culprit. If it runs rough only under load or at full throttle, the main jet is likely worn or clogged. Genuine Craftsman jets are sized precisely for your engine's displacement and fuel type.

Can I clean a Craftsman carburetor main jet instead of replacing it?

Many techs try ultrasonic cleaning or soaking in carb cleaner, but if the jet's internal orifice is pitted or the sealing surface is damaged, cleaning won't restore fuel flow. Varnish buildup from old fuel can sometimes dissolve, but replacement is faster and more reliable—especially mid-season when you want your mower running today, not next week. OEM jets cost far less than a full carburetor rebuild.

How do I find my Craftsman lawn mower's model number to order the correct jet?

Look on the mower deck underside, the engine block, or the rear of the frame—you'll see a metal tag with a model number starting with numbers like 917, 536, or 247. Write it down exactly. Then use our parts finder: enter your model number, select the engine type (Kohler, Briggs & Stratton, etc.), and we'll show you the exact main jet, gasket kit, and carburetor assembly that fit.

Is it normal to need a new main jet after 3-4 seasons of use?

If you mow regularly and store your Craftsman properly (draining fuel in fall), the jet should last many years. However, if fuel sits in the tank over winter, ethanol fuel breaks down and leaves varnish that clogs the jet's tiny orifice. Always use fresh fuel and run the carb dry before storage—but if you inherit an older mower or skip winterization, replacement is usually the quickest fix.

Order Craftsman Lawn Mower Carburetor Main Jet Replacement Online

Ensure optimal fuel efficiency with genuine Craftsman Lawn Mower carburetor main jet replacement parts from Repair Clinic. Replacing the carburetor main jet is key for maintaining the proper fuel-to-air ratio, allowing your mower to run smoothly and efficiently. Use our model number lookup to find the exact part you need, guaranteeing compatibility with your Craftsman mower. Enjoy the convenience of same-day shipping, No-Hassle 365-Day Returns, and our Price Match Guarantee for a reliable shopping experience. For guidance on installation, visit our Lawn Mower Repair Help page. Find more Craftsman Lawn Mower Carburetor Parts to keep your mower in top condition.

Find the Model Number on Your Craftsman Lawn Mower

Craftsman usually places the lawn mower model number on a label attached to the mower deck, engine housing, or rear frame. On riding models, check beneath the seat or along the rear fender; on walk-behind mowers, inspect the deck and engine area. The number may begin with 917, 536, or 247, so copy every digit and letter exactly as shown. Enter it in the model number search, and the catalog will narrow to parts made for your complete mower, including the engine and carburetor system. This saves time when several Craftsman models use similar parts, helping you order with confidence knowing the fit is right.