188-512-1 Primer Bulb for Poulan PP136 PP330 Echo Chainsaw Ryobi Homelite Bolens String Trimmer Leaf Blower - 6 Pack
Pack of six 188-512-1 replacement primer bulbs for 2-cycle small engine carburetors.
188-512-1 primer bulb for 2-cycle small engines shown with a chainsaw in a lifestyle graphic.
188-512-1 primer bulb replacement for small engines with 0.78-inch diameter measurement graphic.
Informational graphic for 530047721 primer bulb showing compatibility and replacement part numbers for small engines.
Infographic showing 188-512-1 primer bulb features with close-ups of the rubber bulb and durable plastic housing.
Close-up of 188-512-1 primer bulb for 2-cycle small engines, showing the clear bulb and black mounting base.
Instructional graphic showing how to install a 188-512-1 primer bulb on a small engine chainsaw.
Close-up of a 188-512-1 primer bulb replacement part for 2-cycle small engines on a BlueStars branded graphic background.
Pack of six 188-512-1 replacement primer bulbs for 2-cycle small engine carburetors.
188-512-1 primer bulb for 2-cycle small engines shown with a chainsaw in a lifestyle graphic.
188-512-1 primer bulb replacement for small engines with 0.78-inch diameter measurement graphic.
Informational graphic for 530047721 primer bulb showing compatibility and replacement part numbers for small engines.
Infographic showing 188-512-1 primer bulb features with close-ups of the rubber bulb and durable plastic housing.
Close-up of 188-512-1 primer bulb for 2-cycle small engines, showing the clear bulb and black mounting base.
Instructional graphic showing how to install a 188-512-1 primer bulb on a small engine chainsaw.
Close-up of a 188-512-1 primer bulb replacement part for 2-cycle small engines on a BlueStars branded graphic background.

188-512-1 Primer Bulb for Poulan PP136 PP330 Echo Chainsaw Ryobi Homelite Bolens String Trimmer Leaf Blower - 6 Pack

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CONFIRM THIS PART FITS
Enter appliance or equipment model number to verify compatibility with this part

503936601 / 188-512-1 Primer Bulb

Key Features

  • Package contains 6 primer bulbs.
  • Snap-in design for direct replacement.
  • Constructed from fuel-resistant polymer to prevent hardening and cracking.
  • Dimensions: Approximately 1-5/16 in (height) x 7/8 in (outer diameter).
  • For use with 2-cycle small engines to assist with cold starts.

Replaces / Cross-Reference Part Numbers

  • Walbro: 188-512-1, 188-512
  • Ryobi / Homelite: 683974
  • Husqvarna / Poulan / RedMax / AYP: 503936601, 530047721
  • Stihl: 4130-350-6200
  • Homelite: 300780002
  • MTD: 791-683974
  • Makita: 168398-2
  • McCulloch: 224242-01
  • Echo: 12318139130
  • Oregon / Rotary: 49-088, 11510

Compatibility & Fitment

  • Fits Brands:
    • Poulan
    • Ryobi
    • Echo
    • Homelite
    • Bolens
    • Husqvarna
  • Fits Equipment:
    • String Trimmers
    • Leaf Blowers
    • Chainsaws
    • Brush Cutters
  • Fits Walbro Carburetor Models:
    • WT-23A
    • WYJ-33
    • WYJ-34
    • WYJ-45
    • WYJ-92
    • WYJ-94
  • Select Confirmed Models:
    • Poulan: PP136, PP136E, PP330, PPB100E, PPB150E, PPB200, PPB250E, PPB300E, PPB350
    • Ryobi: BP42
    • Husqvarna: K750, K760

When to Replace

  • The existing bulb is cracked, brittle, or has turned opaque.
  • The bulb does not return to its original shape after being pressed.
  • Fuel is leaking from or around the primer bulb.
  • The engine is difficult to start and fails to draw fuel.

Installation Tips

  • Disconnect the spark plug wire for safety before performing service.
  • Observe or photograph the fuel line connections before disassembly.
  • Use small pliers to remove the retaining clip and old bulb.
  • Clean the carburetor housing surface before installing the new bulb.
  • Ensure the new bulb is fully seated to create a proper seal.
  • Reconnect the fuel lines to the correct inlet and outlet ports.
188-512-1 Primer Bulb for Poulan PP136 PP330 Echo Chainsaw Ryobi Homelite Bolens String Trimmer Leaf Blower - 6 Pack 1
188-512-1 Primer Bulb for Poulan PP136 PP330 Echo Chainsaw Ryobi Homelite Bolens String Trimmer Leaf Blower - 6 Pack 2
188-512-1 Primer Bulb for Poulan PP136 PP330 Echo Chainsaw Ryobi Homelite Bolens String Trimmer Leaf Blower - 6 Pack 3
188-512-1 Primer Bulb for Poulan PP136 PP330 Echo Chainsaw Ryobi Homelite Bolens String Trimmer Leaf Blower - 6 Pack 4
188-512-1 Primer Bulb for Poulan PP136 PP330 Echo Chainsaw Ryobi Homelite Bolens String Trimmer Leaf Blower - 6 Pack 5
188-512-1 Primer Bulb for Poulan PP136 PP330 Echo Chainsaw Ryobi Homelite Bolens String Trimmer Leaf Blower - 6 Pack 6
  • 188-512-1 Primer Bulb for Poulan PP136 PP330 Echo Chainsaw Ryobi Homelite Bolens String Trimmer Leaf Blower - 6 Pack 1

    WIDE COMPATIBILITY

    Compatible with specific Trimmer/ Chainsaw/ Leaf Blower/ Pole Pruner Saw models of: Poulan, Echo, Stihl, Ryobi, Husqvarna, Bolens
  • 188-512-1 Primer Bulb for Poulan PP136 PP330 Echo Chainsaw Ryobi Homelite Bolens String Trimmer Leaf Blower - 6 Pack 2

    DURABLE MATERIAL

    This part is made of sturdy material which is flexibility and flame-retardant, enhancing durability
  • 188-512-1 Primer Bulb for Poulan PP136 PP330 Echo Chainsaw Ryobi Homelite Bolens String Trimmer Leaf Blower - 6 Pack 3

    SAVING SOLUTION

    Enjoy the great feeling when your engine is repaired and works properly like before - BlueStars brings DIY solutions to help you deal with any trouble
  • 188-512-1 Primer Bulb for Poulan PP136 PP330 Echo Chainsaw Ryobi Homelite Bolens String Trimmer Leaf Blower - 6 Pack 4

    IMPORTANT NOTE

    This is a replacement part designed to be compatible with certain appliances. Any brand names mentioned are used solely to indicate compatibility
THE REPLACEMENT PART THAT KEEP YOUR YARD LOOKING FRESH!

THE REPLACEMENT PART THAT KEEP YOUR YARD LOOKING FRESH!

Compatible Models

Locate the model number of your appliance or equipment on the manufacturer's label and use it to check compatibility before ordering

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FAQs

The most common sign is the bulb losing its elasticity, becoming stiff, or developing visible cracks. If the bulb fails to draw fuel into the carburetor when pressed, or if you notice fuel leaking from the bulb itself, it is time for a replacement. Because these bulbs are made of flexible material, they naturally degrade over time due to exposure to fuel and environmental elements.
This bulb is a direct replacement for Walbro 188-512 and 188-512-1. It also cross-references with numerous OEM part numbers, including Poulan 530047721, 503936601, Echo 123-181-39130, Stihl 4130-350-6200, Craftsman 300780001, 300780004, A056001, and various others such as 683974 and 01183.
This snap-in primer bulb is compatible with a wide range of 2-cycle equipment from brands including Poulan, Echo, Ryobi, Homelite, Bolens, Craftsman, Tanaka, and Toro. It is specifically designed to fit Walbro WT, WYJ, and WYK series carburetors, as well as specific models like the Echo 350, 370, 420 and Tanaka 3350.
Installation is straightforward and typically takes only a few minutes. Because this is a 'snap-in' style bulb, you generally do not need specialized tools. Simply remove the old, damaged bulb by pulling it from the carburetor housing, ensure the area is clean of debris, and press the new bulb firmly into place until it seats securely. It is helpful to ensure the fuel lines are still in good condition while you have the unit accessible.
The primary cause of failure is the breakdown of the rubber material caused by modern ethanol-blended fuels and prolonged exposure to heat and UV light. Over time, the material loses its pliability, leading to cracks or pinhole leaks that prevent the bulb from creating the necessary vacuum to prime the carburetor.