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

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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.

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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.

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Champion Spark Plug, (BPMR7A) SOLID


Bump knob. Fits Stihl# 40047104000.


Quality Stihl Replacement Parts From Repair Clinic

From chainsaws and string trimmers to pressure washers and leaf blowers, Stihl outdoor power tools are designed for reliability and built for the long haul. But even the best equipment requires some maintenance to live up to its full potential. That’s where Repair Clinic lends a hand; our inventory of small engine and equipment parts makes it easy to maintain or repair your Stihl product. Seasonal engine tune-ups are never a problem with quality spark plugs, air filters, fuel filters, and carburetor repair kits from manufacturers like Zama and Walbro. Need a new recoil starter assembly, cutting chain, or trimmer head? Repair Clinic can ship the right part for your equipment fast. Type the full model number into our website’s search bar to find a full list of parts that fit your Stihl equipment. You can use the navigation filters on the left side of the page to refine the search down to just the part or parts you’re looking for. If you’re having difficulty locating the exact part you want, please contact our Customer Service Team at 1-800-269-2609; they will be happy to help.

While you’re here, take a look at Repair Clinic’s extensive collection of "how to” materials. Our thousands of videos, articles, diagrams, and equipment schematics were created to assist you in diagnosing any problem you may be experiencing with your outdoor power equipment, appliances, or heating and cooling products. Once you’ve identified the defective part, we’ll show you how to replace it. DIYers of all abilities know that Repair Clinic will save them time and money.