Keihin PB 18mm Carburetor - Buddy 50 Adjustable Mixture

This Keihin PB carburetor is the adjustable-mixture aftermarket replacement for Genuine Buddy 50 two-stroke scooters and other models requiring an 18mm PB-style carburetor. Restore crisp throttle response and reliable starting with an accessible adjustable mixture screw that lets you dial in the air/fuel ratio without removing the carburetor. The electric auto choke ensures easy cold starts, and the two-bolt flange mount drops straight onto the stock Buddy 50 intake manifold.

Supplied with Genuine Buddy 50 OEM-spec jetting: #40 idle jet and #72 main jet. Other compatible models may require different jetting to suit their engine and intake/exhaust configuration.

Suggested tuning accessory: Add the Prima 4mm Main Jet Tuning Kit for Keihin PB & CVK carburetors when tuning for another application or intake/exhaust changes. Sold separately, the kit includes #70, #75, #80, #85, #90, #95, #100, #105, #110 and #115 main jets. The kit does not include idle jets.

Key Features

• Keihin PB Design: Proven reliability for two-stroke 50cc engines.
• Accessible Mixture Screw: Easy air/fuel tuning without carburetor removal.
• Electric Auto Choke: Reliable cold starts with a plug-and-play connector.
• Two-Bolt Flange Mount: Direct fit to the stock Buddy 50 / Roughhouse 50 intake manifold, with 43mm center-to-center bolt spacing.
• Buddy 50 OEM-Spec Jetting: Supplied with a #40 idle jet and #72 main jet.
• Broader PB-Style Fitment: Fits other models requiring an 18mm PB-style carburetor with matching connections; jetting may need adjustment.

Technical Specifications

• Brand / series: Keihin PB
• Part number: 1300-1118
• MPN reference: P51510000002
• Product designation: 18mm PB-style carburetor
• Venturi: 16mm
• Airbox-side outside diameter: 35mm
• Engine-side mount: Two-bolt flange, 43mm center-to-center
• Idle jet: #40
• Main jet: #72
• Choke: Electric auto choke
• Mixture adjustment: Accessible adjustable screw
• Country of origin: Japan

Compatibility

Before Installation

The yellow piece visible in the photos is a shipping dust cover that keeps debris out of the carburetor during transport. Remove it before installation; it is not an air filter or an operating carburetor component.

This product is intended for off-road use only. This product is not intended for use on public roads or land.

• Keihin PB design for proven 2-stroke reliability
• Adjustable mixture screw - accessible without carb removal
• Electric auto choke for reliable cold starts
• 2-bolt flange mount - 43mm center-to-center
• Direct replacement fit for compatible stock Buddy 50; supplied with OEM-spec #40 idle and #72 main jets
• Yellow shipping dust cover keeps debris out during transport; remove before installation
• Fits other models requiring an 18mm PB-style carburetor with matching connections; application-specific jetting may be required

Brand / series: Keihin PB; Part number: 1300-1118; MPN reference: P51510000002; Classification: aftermarket replacement; Product designation: 18mm PB-style; Venturi: 16mm; Airbox-side OD: 35mm; Engine-side mount: two-bolt flange, 43mm center-to-center; Idle jet: #40; Main jet: #72; Supplied jetting: Genuine Buddy 50 OEM specification; Choke: electric auto choke; Mixture: accessible adjustable screw; Yellow cover: shipping dust cover, remove before installation; Country of origin: Japan; Use: off-road only

Genuine Buddy 50 2T (two-stroke), supplied with Buddy OEM-spec #40 idle jet and #72 main jet; also fits other models requiring an 18mm PB-style carburetor with matching 43mm flange spacing, 35mm airbox connection, cable and choke configuration; other applications may require different jetting