About this product
OVERVIEW
This replacement accelerator pump diaphragm restores precise fuel delivery to affected Keihin carburetors, eliminating hesitation and flat spots during throttle transitions. Designed as a direct aftermarket repair component, it addresses worn seals that cause rich idles or hard starting without requiring full carburetor disassembly. Built from standard elastomer compounds, it drops into Harley-Davidson Sportster, Softail, Dyna, and Touring platforms to return factory-calibrated metering.
ENGINEERING & PERFORMANCE
The diaphragm rapidly displaces pressurized fuel toward the primary nozzle when the throttle plate cracks open, maintaining seamless mixture ratios during acceleration. Reinforced elastomer construction absorbs chronic V-twin vibration while resisting swelling from modern oxygenated fuel blends. Precision-thickened walls prevent premature cracking or fatigue, extending service life between complete carburetor rebuilds. The direct-fit geometry aligns with existing pump chambers without shimming or adapter modifications.
KEY FEATURES
- Accelerator pump diaphragm replacement specifically machined for Keihin carburetors
- Drops in as a direct OEM-style update for part number 27361-76
- Sold individually for targeted maintenance and carburetor restoration projects
- Stabilized rubber composition resists heat cycling and fuel absorption
- Maintains consistent diaphragm flex to prevent lean spikes on throttle snap-open
- Restores calibrated pump stroke volume without external adjustments
- Cross-compatible across multiple Harley-Davidson model families
- Designed to withstand high-RPM vibration typical of air-cooled twin platforms
- Eliminates unnecessary carburetor teardown labor through straightforward swap installation
TECHNICAL SPECIFICATIONS
- Brand: Keihin
- Part Name: Carburetor Accelerator Pump Diaphragm
- Part Type: Hardware
- Material: Synthetic Elastomer
- Supported Years: 1988–2006
- Compatible Harley Trims: Touring, Softail, Dyna, Sportster
FITMENT
- Harley Touring (1988–2006)
- Harley Softail (1991–2006)
- Harley Dyna (1990–2005)
- Harley Sportster (1988–2006)
WHY HARLEY RIDERS CHOOSE THIS
Riders install this diaphragm when stock components degrade, creating inconsistent throttle response that routine rejetting cannot fix. The hardened elastomer formulation holds its shape under prolonged exposure to ethanol blends and engine heat, reducing the frequency of future carburetor interventions. By resetting the accelerator pump’s mechanical action, it clears fuel starvation gaps and stabilizes mixture enrichment during rapid acceleration phases. Tailored to Keihin-equipped Harley architectures, it delivers reliable, factory-spec performance without the expense or downtime of full carburetor replacement.
Description supplied by JT Cycle & ATV through its current Shopify listing. Product, performance, and health claims are the seller’s and have not been independently verified by StorkScout.
