BXparts 2PCS Primer Bulb & Fuel Line For YardMax 170cc YG1550 YG1650 Lawn Mower

What It Is

This is a replacement primer bulb and fuel line kit for YardMax 170cc push mowers. It restores the manual fuel priming function on models YG1550 and YG1650, allowing you to pump fuel into the carburetor before starting.

Fitment & Compatibility

• Exact models: YardMax YG1550 and YG1650 (170cc engines). Not for other YardMax models or brands.
• OEM reference: Replaces OEM part numbers 724-04420 and 724-04421. Cross-check your mower’s parts diagram.
• Measurements: Bulb diameter is ~1 inch; fuel line is 5/32-inch inner diameter, ~12 inches long. Measure your existing bulb and line to confirm.
• What to check: Verify your mower has a push-in bulb (not a squeeze-bulb type) and that the fuel line routing matches the included line length.

Key Things to Know

• Quality: The bulb is soft rubber—should last a season or two but may harden with ethanol gas. Use fuel stabilizer.
• Installation: Easy, no special tools. Remove the old bulb by prying it out; push the new one in until seated. Replace fuel line by pulling old line off the carburetor nipple and pressing new line on.
• Common gotcha: The included line may be slightly longer than stock—trim to fit without kinking. Don’t overtighten any clamps (if used) to avoid pinching the line.
• No warranty or support: BXparts is a generic seller; no OEM packaging or technical support.

Should You Buy It

Buy this if your YardMax YG1550 or YG1650 won’t prime and the original bulb is cracked or loose. It’s a cheap, quick fix for a common wear item. Skip it if you have a different model—fitment is narrow. For a few dollars more, an OEM bulb may last longer, but this works fine for most DIY repairs.