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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.


Bump knob. Fits Stihl# 40047104000.


Quality Stihl String Trimmer Replacement Parts From Repair Clinic

Like all of the company’s power equipment, Stihl string trimmers are designed for reliability and built for the long haul. But after repeated use, even the best power equipment will require maintenance to live up to its full potential. That’s where Repair Clinic trims away the competition; our inventory of small engine and equipment parts makes it easy to maintain or repair your Stihl string trimmer. 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, trimmer head, or bump knob? Repair Clinic can ship the right part for your string trimmer fast. Enter the full model number of your Stihl string trimmer into our website’s search bar to find a full list of matching parts. 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.

More than just a parts dealer, Repair Clinic maintains an 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 string trimmer, as well as all other outdoor power equipment, appliances, or heating and cooling products. Once you’ve identified the defective part, we’ll show you how to replace it. From novices to professionals, Repair Clinic is your do-it-yourself partner.