Carburetor Carb Replacement For Poulan Pro Riding Mowers PP175G42 w/Briggs & Stratton 17.5 HP engine, For Briggs & Stratton 14.5 OHV I/C Quiet Motor 14.5HP, Walbro 791886 LMT-5-4993 697216 15.5 HP

What It Is

This aftermarket carburetor replaces the stock Walbro unit on select Poulan Pro riding mowers and other lawn tractors using Briggs & Stratton 14.5–17.5 HP engines. It’s designed for machines like the PP175G42, where the original carb fails due to ethanol varnish or clogged jets.

Fitment & Compatibility

• Primary fit: Poulan Pro PP175G42 with Briggs & Stratton 17.5 HP engine (model 31C707, 31P977, or similar).
• Also fits: Briggs & Stratton 14.5 OHV I/C Quiet Motor (14.5 HP) and some 15.5 HP engines with Walbro carb number 791886, LMT-5-4993, or 697216.
• What to check before buying:
  • Engine model number (stamped on valve cover or blower housing) – must be a single-cylinder OHV with side-draft carb mount.
  • Carburetor gasket pattern – this unit uses a two-bolt mounting flange; verify it matches your intake manifold.
  • Fuel line diameter – typically 1/4″; measure your existing lines to ensure they fit the barb fittings.
  • Throttle/choke linkage – your original linkage arms may need to be reused; this carb comes with generic springs and a basic linkage kit.
  • Deck size irrelevant – this part is engine-specific, not deck-specific.

Key Things to Know

• Quality varies – This is a non-OEM (aftermarket) carb. Many users report it works fine after a quick clean, but some need minor adjustment to the float height or idle mixture screw.
• Installation difficulty – Moderate (3/10). You’ll need a socket set, screwdriver, and possibly a small file to deburr the mounting gasket surface. Expect 30–60 minutes.
• Common gotcha – The included gaskets may be thinner than OEM. Use a thin layer of gasket sealant on the intake manifold side if you get a vacuum leak.
• Tuning required – After installation, adjust the idle speed screw (turn in until engine idles smoothly, then back out 1/4 turn). The main jet is not adjustable on this model.

Should You Buy It

Buy this if your current carb is leaking, flooding, or won’t run after ethanol-related clogging, and you want a budget fix for a 14.5–17.5 HP Briggs engine. It’s not perfect – expect to tweak the idle and maybe swap your original linkage – but at $23.89 it’s a good value for a functional replacement on older tractors. Skip it if you need exact OEM fit or have a twin-cylinder engine.