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Champion Spark Plug (RC12YC). The spark plug ignites the fuel and air mixture in the cylinder to power the engine. If the spark plug is burnt, fouled or damaged the engine may not start or may run rough.

Husqvarna fuel filter. If the fuel filter is clogged, it will restrict the flow of fuel to the carburetor. As a result, the engine may not start.

NGK spark plug. The spark plug ignites the fuel and air mixture in the cylinder to power the engine. If the spark plug is burnt, fouled or damaged the engine may not start or may run rough.

Primer bulb. The primer bulb draws fuel into the carburetor to make the engine easier to start.

Briggs and Strartton in-line fuel filter with 40 micron rating and 1/4" inlet & outlet. If the engine does not start then the fuel filter may be clogged and not allowing enough fuel to enter the carburetor.

Briggs & Stratton Original Equipment 492932S Oil Filter. Length: 2 1/4 inches. For optimum performance, we recommend changing the oil in your small engine after the first five hours of use. After that, change the oil on a yearly basis or after every 50 hours of use (whichever comes first).

Fuel Line (Small)- 9/64 (.140) inch OD - (.080) inch ID, W/ Installation instructions.

Fuel pump. If this fuel pump is being installed on a Intek V-Twin engine originally equipped with a metal fuel pump, related item 1567967. The fuel pump supplies fuel to the carburetor while the engine is running. If the fuel pump is clogged, the engine may not start or may run rough.

Walbro primer bulb. The primer bulb draws additional fuel into the carburetor to make the engine easier to start. If the primer bulb is leaking, replace it.

Fuel line (Large). The fuel line allows fuel to travel from the fuel tank to the carburetor and from the primer bulb to the fuel system.

Chainsaw fuel cap with retainer

Champion spark plug (RCJ6Y). The spark plug ignites the fuel and air mixture in the engine's cylinder to power the engine. If the spark plug is has fouled (if the tip of the spark plug is burnt or damaged), the engine may not start or may run rough.

Primer bulb (or purge bulb) assembly. The primer bulb draws fuel into the carburetor to make the engine easier to start. The short port on the primer bulb is the inlet. The longer port is the outlet back to the fuel tank.

Purge bulb (or primer bulb) kit. The primer bulb draws fuel into the carburetor to make the engine easier to start. This replacement primer bulb features a smaller port. You will need to purchase a smaller fuel line.

NGK Spark Plug, (BPMR7A) SOLID
Stihl is the world's #1 selling outdoor power equipment brand — and Repair Clinic carries genuine OEM Stihl parts for chainsaws, string trimmers, leaf blowers, hedge trimmers, and edgers. Whether you own a MS250 chainsaw, FS55 trimmer, or BR600 backpack blower, we stock the hard-to-find parts that keep your equipment running strong.
Stihl equipment is dealer-exclusive when new, but replacement parts are available here at competitive prices. If your Stihl won't start, runs rough, or has lost power, one of these common failures is likely the culprit:
Enter your Stihl model number to find the exact OEM parts for your equipment — carburetors, ignition modules, fuel pumps, throttle cables, and more.
The most common cause is a clogged carburetor from stale fuel or ethanol damage. If your Stihl has sat for more than a few months, the carburetor float, needle, and jets are prone to varnish buildup. A carburetor rebuild kit or full replacement often fixes the hard-start issue. If the engine turns over but won't ignite, check the spark plug next — a fouled plug is the second-most common reason Stihl equipment won't fire. Always use fresh fuel with a 50:1 oil-to-gas mix for Stihl 2-stroke engines.
Stihl model numbers are stamped or printed on a label near the engine block or fuel tank. For chainsaws, look on the side of the housing or under the air filter cover. For trimmers and blowers, check the shaft near the motor housing or on the fuel tank. Common Stihl models include MS250, MS290, MS310, FS55, FS90, FS131, BG55, and BR600. Once you have the model number, use Repair Clinic's lookup tool to see all compatible parts — carburetor, fuel lines, ignition coils, and more.
Stihl parts are engineered to precise specifications — ignition modules, carburetors, and fuel delivery systems are all model-specific. Aftermarket carburetors and fuel system parts often have poor fitment or cause lean-running conditions that damage the engine. For reliability and model-specific fit and performance, always use genuine OEM Stihl parts. Repair Clinic stocks the full range of OEM Stihl parts at prices competitive with dealer ordering.
Use fresh fuel mixed to the correct 50:1 ratio (Stihl-approved 2-stroke oil). Before winter storage or after extended downtime, run the engine on a lean fuel mixture or drain the carburetor bowl to prevent ethanol varnish buildup. If your equipment has been sitting for months and won't start, a carburetor rebuild kit or fuel system cleaning is often all that's needed — don't condemn the whole unit without trying a $20 to $40 carburetor kit first.


Ordering Stihl brand-level parts online is simple and helps you find genuine OEM parts for your unit. With same-day shipping on most in-stock items, you'll have your replacement part fast, minimizing downtime. Our model/part number lookup finds the exact OEM part for your unit, and every order is backed by our 365-day return policy and price-match guarantee. Browse our repair help section for troubleshooting tips, part testing guides, and step-by-step installation videos for your specific product.
Stihl places the model number on a label near the engine block or fuel tank. On chainsaws, check the side of the powerhead housing or under the air filter cover. For string trimmers and leaf blowers, look on the shaft near the motor housing, the main housing, or the fuel tank. The model number identifies the complete piece of equipment, not just a single replacement part. Once you find it, type it into our model number lookup and the catalog narrows to parts made for your unit, including engine, fuel, ignition, chain, and trimmer parts. You will spend less time comparing specifications and more time making a confident repair.

Repair Clinic's online resources are built to help you get your Stihl back in service without unnecessary trial and error. Start with the diagnostic article for your symptom, watch a repair video that shows the parts and tools involved, then follow the step-by-step written guide as you work. Part testing walkthroughs confirm the failed component, and the model number lookup confirms the exact OEM part before you order.

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