Replace Primer Bulb Video
Starting your mower without a functioning primer bulb is difficult, and especially so as the summer fades and days turn cooler.
This video covers primer bulb replacing, a common cause of hard cold starts.
You’ll find useful resources on this page, tips, links to tools, parts and supplies required to complete your repair.
Primer bulbs have an important function, they add extra gas to the engine in preparation for a smooth start. Without the extra gas the engine likely won’t start, or starts and stumbles.
Primer bulbs get a ton of use and as they’re made from rubber perish over time. Luckily replacing the primer bulb is easy and you won’t even need to remove any components, it’s all covered in this video.
Before working on your mower be sure to remove the plug wire to prevent accidental starting, see “Repair Safety Video”.
Tools & Parts
To nail this procedure you may need the following tools, parts and supplies.
Ratchet Tool Set
Before we can do anything, we'll need tools. I've selected this set as I own some Craftsman tools and while I have worn some out, they did do a lot of work. So I expect this set will last the occasional user quite a long time.
This set carries both metric and standard sockets and that's important, because some mowers will have both type of fastener sizes. Set includes spark plug sockets. Picture links to Amazon.com