Parts for Briggs & Stratton 9T502-3852-B1: Cylinder / Crankshaft / Crankcase Parts

Seals between crankcase and crankshaft to prevent oil leaks and contamination. Replace if you notice oil pooling or engine performance issues.

Seals the cylinder and head on small engines. Replace if you notice oil leaks, loss of compression, or overheating. Confirm fit with your model number.

Crankcase gasket seals the engine housing to prevent oil leaks. Replace if you notice oil seepage or during crankcase repairs. Confirm fit with your model.

Fix loose engine mounts or rattling accessories with this flange bolt. Secures engines and components in lawn mowers, generators, and pressure washers.

Seals the crankcase shaft to prevent oil leaks and maintain proper engine pressure. Replace when you notice oil leaking or reduced performance.

Engine won't restart after hitting an object? A sheared flywheel key is often the cause. This small part keeps the flywheel connected to the crankshaft.

Fix engine knocking or loss of power with this piston pin lock. Secures the piston pin in small engines. Essential for proper piston assembly.

Replacement connecting rod for lawn and garden engines. Connects piston to crankshaft. Order when original rod is broken, cracked, or damaged.

This screw is a genuine Midwest Engine replacement part for small engine appliances, including lawn tractors, lawn mowers, snowblowers, leaf blowers, vacuums, and tillers. The purpose of a screw is to tightly link materials together through rotation that pierces into the material. A screw might have to be replaced in the event that it is lost or misplaced, a common occurrence due to its size. A screw might also be replaced if it deteriorates over time, through erosion, cracking, or piercing, thereby reducing its efficacy in holding materials together. This kind of damage can be attributed to general overuse, to age, or simply to long-term exposure. If a screw is subject to any of this kind of damage, it is best to replace it immediately, as the materials held together by the screw must continue to be held together. Remember to always wear gloves when handling, repairing, and operating outdoor equipment. This screw is compatible with the following brands: Briggs & Stratton, Toro, Cub Cadet, and Lawn Boy.

This valve spring is made for small engines and works on a range of different types of outdoor equipment. The valve spring plays an important role in internal combustion engines. A camshaft will open the valves, often using valve lifters. The spring is responsible for closing the lifters. Some of the symptoms of a broken valve spring include performance issues such as misfiring and loss of power, noise from the valve, and eventually internal damage to the machine's engine. Those who believe they have a damaged or broken valve spring should replace the spring as soon as possible. This will ensure the machine continues to run properly. This is a genuine OEM valve spring that is sold individually. The spring will work for many types of small engines including those found on lawn mowers, tillers, yard vacuums, and generators. Brands that can utilize the valve spring include Toro, Cub Cadet, MTD, Simplicity, Craftsman, Lawn-Boy, Murray, and Briggs & Stratton.

Replace a worn valve retainer if your engine has compression loss or valve train noise. This washer-shaped part secures the valve spring lock on the valve.

Replace a frayed or broken starter rope that prevents your lawn mower engine from starting. Simple DIY repair that restores pull-start function.

Replacement mounting screw for lawn and garden engines. Secures components together during operation. Replace if stripped, missing, or damaged.

Hardware screw for securing components on lawn and garden engine equipment. Replace stripped, lost, or damaged screws on housings and covers. Standard fastener.

Fix an engine that won't start or starts then dies with this carburetor rebuild kit. Clears fuel blockages in small gas engines. Easy screwdriver repair.

Seals between air cleaner and carburetor on small engines. Replace if torn, compressed, or causing air leaks that affect performance. Verify fit.

O-ring seal for lawn and garden engines. Replace when worn, cracked, or leaking to prevent oil and fuel leaks. Verify fit with your engine model number.

Flange screw for lawn and garden engines. Distributes connection force over a larger area. Replace if threads are stripped, head is damaged, or screw is missing.

Engine won't idle properly or surges? This governor idle spring regulates throttle control. Simple repair with basic tools in under 30 minutes.

Is your lawn mower or engine excessively loud? A damaged or rusted muffler causes excessive noise. This muffler replacement reduces engine sound effectively.

Metal mounting screw for lawn and garden engines. Secures components together throughout the equipment. Replace when stripped, rusted, or missing.

Engine won't start? A worn pawl friction plate in the starter assembly prevents cranking. This small engine part transfers power to the starter cup.

Engine air cleaner filters debris and dust from intake air. Replace when clogged or damaged to maintain performance. Verify fit with your model number.

Secures engine components on gas line trimmers. Replace this mounting nut if it's stripped, corroded, missing, or no longer holds parts firmly in place.

Replacement screw that secures the pawl friction plate in lawn and garden engines. Replaces lost, stripped, or damaged flange bolts on the recoil assembly.

Fix a lawn mower that won't pull start with this complete recoil starter assembly. Includes pulley, housing, grip, and spring for easy installation.

Seals the intake manifold to maintain proper pressure in your engine. Replace if cracked, worn, or causing air leaks. Verify fit with your model number.

Engine won't shut off when you turn the key? Replace your lawn mower's stop switch to restore safe engine control. Simple safety repair.

Engine won't start or runs rough? A cracked or missing spark plug boot causes misfiring and prevents proper ignition. Easy DIY replacement part.

Fix a stretched or broken starter rope spring with this friction spring. Prevents pulley damage and overstretching. Fits small engines on snow throwers, pressure washers, and generators. Easy DIY repair.

If your small engine won't start or has no spark, a faulty spark plug terminal may be the cause. This terminal connects the ignition coil to the plug.

This spring brake is a genuine Midwest Engine part that can be used as a replacement part for outdoor appliances with small engines, including lawn mowers, chipper shredders, snowblowers, and other such appliances. Spring brakes are a braking system employed a large, coiled spring that is kept under high tension; the control valves attached to the spring brake are the mechanism by which the spring brake is released.If the spring brake has been damaged, is malfunctioning, or is in a state of disrepair, this will manifest in the form of a sudden, volatile eruption from the air brake chamber. This is a dangerous state for a small engine, so repair should be conducted immediately. Additionally, a new spring brake part should be ordered before any attempt to use the appliance without a proper repair. Remember to always wear gloves when handling, repairing, and operating outdoor equipment, and stay safe around the small engine of the appliance if the spring brake has malfunctioned and caused a dangerous situation.This spring brake is compatible with the brands Briggs and Stratton, Cub Cadet, and Toro.

Secures to the fuel tank to prevent debris and dirt from entering the fuel system. Replace if cracked, damaged by impact, or missing to protect engine.

Pull cord won't retract or mower won't start? This recoil starter pulley spring assembly restores proper tension. Easy DIY install in under an hour.

This authentic replacement item is a user's repair manual for Briggs & Stratton appliance engines. Whenever an operator has a problem with their appliance's engine, it's standard that they check the user's manual. It includes step-by-step directions for how to diagnose and then repair faulty parts. Many appliances use the same type of engine, so this manual is compatible with a wide variety of Briggs & Stratton products. It can also be used with some Toro and Lawn Boy engines as well. This product is sourced from the original manufacturer and ships individually. Any parts needed to make the repairs included in this manual will have to be purchased separately.