A sharper throttle and no hesitation come from the right accelerator pump choice. Use Holley 30cc or 50cc diaphragms for street or performance applications, and consider the Edelbrock 1468 assembly as a ready-made upgrade.
For dirt bikes, the metal-rubber rebuild kit that replaces OEM 16021-MEB-771 offers durability, while a universal OXCANO kit provides broader fitment. Match pump capacity to engine size, check stem length and seals, and plan to tune jets after installation for smoother throttle response.
| Carburetor Accelerator Pump Diaphragm Rebuild Kit for Dirt Bikes |
| Best For Dirt Bikes | Compatibility / Fitment: Specific dirt-bike models (Honda CRF/CRF250R/CRF250X, Kawasaki KX250F/KLX450R, Yamaha WR250F, plus some TRX/KX/YZ/KTM models) — replaces 16021-MEB-771 | Function / Purpose: Accelerator pump diaphragm rebuild — restore pump fuel delivery and throttle response | Material / Construction: Metal and rubber components (high-quality rubber diaphragm, corrosion-resistant metal) | VIEW LATEST PRICE | Read Our Analysis |
| Carburetor Accelerator Pump Diaphragm Rebuild Kit (Universal) |
| Wide Compatibility | Compatibility / Fitment: Wide motorcycle/ATV/KT M lists (Honda CRF/TRX, Yamaha YFZ/YZ/WR, Suzuki RMZ, Kawasaki KX/KLX, KTM various) — replaces 16021-MEB-771 | Function / Purpose: Accelerator pump diaphragm rebuild — restore pump fuel delivery and throttle response | Material / Construction: Rubber diaphragm and rebuild components (brand-new, high quality) | VIEW LATEST PRICE | Read Our Analysis |
| Carburetor Accelerator Pump Diaphragm for Holley 4150/4160 |
| Holley 4150 Fit | Compatibility / Fitment: Holley 4150 / 4160 carburetors | Function / Purpose: Replace worn accelerator pump diaphragms to maintain fuel metering (30cc) | Material / Construction: Durable rubber compound diaphragm manufactured to specification | VIEW LATEST PRICE | Read Our Analysis |
| 50cc Accelerator Pump Conversion Kit for Holley 4150 |
| High-Flow Upgrade | Compatibility / Fitment: Holley 4150 carburetors (50cc conversion) | Function / Purpose: 50cc conversion kit to increase accelerator pump fuel delivery and throttle response | Material / Construction: Precision-machined metal components and high-quality materials (conversion kit) | VIEW LATEST PRICE | Read Our Analysis |
| 30cc Accelerator Pump Diaphragm for Holley Carburetors |
| Reliable 30cc Choice | Compatibility / Fitment: Holley 2300, 4150, 4160 carburetors (30cc replacement) | Function / Purpose: 30cc accelerator pump diaphragm replacement for Holley carburetors | Material / Construction: High-quality rubber/material diaphragm for long-lasting operation | VIEW LATEST PRICE | Read Our Analysis |
| Carburetor 30cc Accelerator Pump Diaphragm (2-Pack) |
| Dual-Pack Value | Compatibility / Fitment: Holley 2300 and 4150 carburetors (30cc replacement) | Function / Purpose: 30cc accelerator pump diaphragm replacement (2-pack) for Holley carburetors | Material / Construction: High-quality rubber/material diaphragm (135-10) | VIEW LATEST PRICE | Read Our Analysis |
| Edelbrock 1468 Accelerator Pump Assembly |
| Complete Assembly | Compatibility / Fitment: Accelerator pump assembly for specific Edelbrock applications (Edelbrock 1468 fitment) | Function / Purpose: Complete accelerator pump assembly (pump, spring, cup) to supply extra fuel via pump circuit | Material / Construction: Metal/plastic/spring components with durable pump cup (assembly) | VIEW LATEST PRICE | Read Our Analysis |
| AP171 Accelerator Pump Diaphragm for Motorcraft 2150 |
| Motorcraft Specific | Compatibility / Fitment: Motorcraft 2150 2-barrel carburetor (specific Motorcraft part numbers listed) | Function / Purpose: Accelerator pump diaphragm for Motorcraft 2150 to restore pump function (AP171) | Material / Construction: Rubber diaphragm (AP171) — brand new, susceptible to ethanol wear notes | VIEW LATEST PRICE | Read Our Analysis |
| 135-7 50cc Accelerator Pump Diaphragm for Holley Carburetors |
| 50cc Performance | Compatibility / Fitment: Holley 2300, 4150, 4160, 4500 carburetors (50cc, 135-7) | Function / Purpose: 50cc accelerator pump diaphragm to provide correct pump fuel volume and improve response | Material / Construction: High-quality rubber/material diaphragm (50cc, OEM replacement) | VIEW LATEST PRICE | Read Our Analysis |
| Accelerator Pump Diaphragm Kit for Holley Carburetors |
| Fleet-Ready Kit | Compatibility / Fitment: Holley 2300, 4150, 4160, 4500 carburetors (50cc, replaces 135-7) | Function / Purpose: Accelerator pump diaphragm kit (50cc) for precise fuel delivery and improved throttle response | Material / Construction: Oil- and heat-resistant rubber/material diaphragms (durable) | VIEW LATEST PRICE | Read Our Analysis |
More Details on Our Top Picks
Carburetor Accelerator Pump Diaphragm Rebuild Kit for Dirt Bikes
Should you ride off-road and want quick, reliable throttle response, this carburetor accelerator pump diaphragm rebuild kit is a smart choice for you. You’ll fit it to many bikes like Honda CRF250R and CRF250X, Kawasaki KX250F and KLX450R, Yamaha WR250F, plus select TRX450R and KTM 530EXC models. It replaces part 16021-MEB-771 and keeps fitment simple whenever you check the product description. Made of quality metal and rubber, it resists corrosion and heat while keeping elasticity. Seals are strong to stop leaks and odd pressure. You’ll notice faster fuel delivery, less lag, and steadier engine behavior.
- Compatibility / Fitment:Specific dirt-bike models (Honda CRF/CRF250R/CRF250X, Kawasaki KX250F/KLX450R, Yamaha WR250F, plus some TRX/KX/YZ/KTM models) — replaces 16021-MEB-771
- Function / Purpose:Accelerator pump diaphragm rebuild — restore pump fuel delivery and throttle response
- Material / Construction:Metal and rubber components (high-quality rubber diaphragm, corrosion-resistant metal)
- Pump Capacity / Size (where specified):(Not explicitly cc-rated; motorcycle diaphragm rebuild for OEM part 16021-MEB-771)
- Installation / Fit Ease:Rebuild kit designed for direct replacement of OEM diaphragm — straightforward install per model fitment
- Durability / Resistance:Corrosion resistant metal; high aging and temperature resistance; maintains elasticity under heat/pressure
- Additional Feature:Reduces acceleration lag
- Additional Feature:Prevents engine stalling
- Additional Feature:Corrosion-resistant metal parts
Carburetor Accelerator Pump Diaphragm Rebuild Kit (Universal)
Should you want a dependable, easy-to-install rebuild kit that fits a wide range of dirt bikes and ATVs, this Carburetor Accelerator Pump Diaphragm Rebuild Kit is a smart pick. You’ll get a brand new OXCANO kit that replaces OE number 16021-MEB-771 and feels high quality. It fits many Hondas, Yamahas, Suzukis, Kawasakis, and KTMs across model years roughly 1998 to 2017. You can install it with basic tools and a calm pace. In the event issues arise, contact OXCANO support and expect a reply within 24 hours. You’ll appreciate the reassurance and reliable performance.
- Compatibility / Fitment:Wide motorcycle/ATV/KT M lists (Honda CRF/TRX, Yamaha YFZ/YZ/WR, Suzuki RMZ, Kawasaki KX/KLX, KTM various) — replaces 16021-MEB-771
- Function / Purpose:Accelerator pump diaphragm rebuild — restore pump fuel delivery and throttle response
- Material / Construction:Rubber diaphragm and rebuild components (brand-new, high quality)
- Pump Capacity / Size (where specified):(Not explicitly cc-rated; OEM replacement 16021-MEB-771)
- Installation / Fit Ease:Brand-new rebuild kit; direct-fit compatibility lists — straightforward installation
- Durability / Resistance:High-quality materials; sold as high quality and durable (manufacturer support)
- Additional Feature:24-hour customer support
- Additional Feature:Broad multi-brand coverage
- Additional Feature:Sold as brand-new
Carburetor Accelerator Pump Diaphragm for Holley 4150/4160
Should you want reliable throttle response and easy maintenance for a Holley 4150 or 4160 carburetor, this 30cc accelerator pump diaphragm kit is a great choice because it replaces worn parts with durable, precisely made components that fit snugly and need no after installation tweaks. You’ll get two 30cc diaphragms that match replacement numbers 135-5 and fit 135-12 applications. They restore proper fuel metering so your engine responds smoothly. The rubber compound resists heat and pressure for long life. Installation is simple, saves time, and you won’t need to readjust the carburetor afterward.
- Compatibility / Fitment:Holley 4150 / 4160 carburetors
- Function / Purpose:Replace worn accelerator pump diaphragms to maintain fuel metering (30cc)
- Material / Construction:Durable rubber compound diaphragm manufactured to specification
- Pump Capacity / Size (where specified):30cc (two pieces)
- Installation / Fit Ease:Snug fit, no readjustment needed after installation — quick replacement
- Durability / Resistance:Durable rubber compound engineered to withstand heat and pressure changes
- Additional Feature:30cc pump volume
- Additional Feature:Exact OEM specifications
- Additional Feature:Sold as 2-pack
50cc Accelerator Pump Conversion Kit for Holley 4150
Should you want sharper throttle response on a Holley 4150, the 50cc accelerator pump conversion kit is a smart choice that gives you an immediate fuel hit the moment you open the throttle. You’ll notice smoother acceleration and quicker throttle response because the kit delivers an instant burst of fuel on each input. It replaces worn parts during a Holley 4150 rebuild and fits many 50cc applications. Precision machined components and high quality materials mean reliable operation and long service life. Installation is straightforward since the kit includes all necessary parts, so you can get back on the road fast.
- Compatibility / Fitment:Holley 4150 carburetors (50cc conversion)
- Function / Purpose:50cc conversion kit to increase accelerator pump fuel delivery and throttle response
- Material / Construction:Precision-machined metal components and high-quality materials (conversion kit)
- Pump Capacity / Size (where specified):50cc conversion kit
- Installation / Fit Ease:Includes all components; straightforward, hassle-free installation on compatible carbs
- Durability / Resistance:Precision-machined, high-quality materials for reliable long service life
- Additional Feature:50cc high-capacity kit
- Additional Feature:Precision-machined components
- Additional Feature:Includes all components
30cc Accelerator Pump Diaphragm for Holley Carburetors
In case you work on Holley carburetors and want reliable throttle response, the 30cc accelerator pump diaphragm is a smart pick for you. You’ll get the 135-10 model that directly replaces Holley 135-5, 135-10, and 135-12 parts, and it fits 2300 two-barrel plus 4150 and 4160 four-barrel carburetors. The 30cc capacity gives steady fuel squirt for crisp accelerations. It’s made from quality materials so it lasts, and it comes as a two-pack so you can service both sides or keep a spare. Installation is simple, and you’ll notice smoother throttle feel right away.
- Compatibility / Fitment:Holley 2300, 4150, 4160 carburetors (30cc replacement)
- Function / Purpose:30cc accelerator pump diaphragm replacement for Holley carburetors
- Material / Construction:High-quality rubber/material diaphragm for long-lasting operation
- Pump Capacity / Size (where specified):30cc (135-10)
- Installation / Fit Ease:Direct replacement; straightforward installation (2-pack)
- Durability / Resistance:High-quality materials for reliable, long-lasting operation; wear resistant
- Additional Feature:Compatible with multiple Holley models
- Additional Feature:30cc pump capacity
- Additional Feature:Supplied as 2-pack
Carburetor 30cc Accelerator Pump Diaphragm (2-Pack)
In case you want a simple, reliable fix for a hesitant throttle, this 30cc accelerator pump diaphragm 2-pack is a great choice for DIYers and pros alike. You get two 135-10 diaphragms that directly replace Holley 135-5, 135-10, and 135-12 parts. They fit Holley 2300 and 4150 carburetors, so you can use them across those models without guessing. Each pump delivers a 30cc shot, giving you predictable throttle response. The materials hold up for long use, and installation stays straightforward. You’ll feel confident tackling maintenance or repairs, aware the parts are built to last.
- Compatibility / Fitment:Holley 2300 and 4150 carburetors (30cc replacement)
- Function / Purpose:30cc accelerator pump diaphragm replacement (2-pack) for Holley carburetors
- Material / Construction:High-quality rubber/material diaphragm (135-10)
- Pump Capacity / Size (where specified):30cc (135-10, 2-pack)
- Installation / Fit Ease:Straightforward, hassle-free installation (direct replacement)
- Durability / Resistance:Manufactured from high-quality materials for dependable, long-lasting operation
- Additional Feature:Universal Holley fitment
- Additional Feature:30cc pump volume
- Additional Feature:Pack of two
Edelbrock 1468 Accelerator Pump Assembly
Should you want a reliable way to stop hesitation and get smooth throttle response, the Edelbrock 1468 accelerator pump assembly is a smart choice for street performance and mild race use. You’ll notice it delivers extra fuel through the accelerator pump circuit right as you need it, so your engine won’t stumble at part throttle. It includes the pump, spring, and cup assembly, so you’ll have the parts to fit and repair the circuit without hunting for extras. You can trust its durability and reliability because it’s designed specifically for accelerator pump circuit applications and to help your engine deliver more power.
- Compatibility / Fitment:Accelerator pump assembly for specific Edelbrock applications (Edelbrock 1468 fitment)
- Function / Purpose:Complete accelerator pump assembly (pump, spring, cup) to supply extra fuel via pump circuit
- Material / Construction:Metal/plastic/spring components with durable pump cup (assembly)
- Pump Capacity / Size (where specified):(Assembly — capacity not stated; provides extra fuel via pump circuit)
- Installation / Fit Ease:Includes pump, spring, cup — install to accelerator pump circuit (intended to be direct fit)
- Durability / Resistance:Designed for lasting durability (assembly components built to last)
- Additional Feature:Includes spring and cup
- Additional Feature:Brand-specific Edelbrock part
- Additional Feature:Designed for added power
AP171 Accelerator Pump Diaphragm for Motorcraft 2150
Should you own a Motorcraft 2150 two-barrel carburetor and want reliable throttle response, the AP171 accelerator pump diaphragm is a top choice you can count on. You’ll find it fits Motorcraft 2150 and compatible part numbers like D5AZ-9B559-A and C0AE-9B559-A. It also serves some 1979–1989 Jeep Grand Wagoneer carburetors. The stem measures 7/8 inch, so check fit before installation. It arrives brand new and unused, but you should know ethanol in fuel speeds wear, especially at 5 to 10 percent. Keep spare diaphragms on hand, and you’ll avoid sudden throttle hesitation on the road.
- Compatibility / Fitment:Motorcraft 2150 2-barrel carburetor (specific Motorcraft part numbers listed)
- Function / Purpose:Accelerator pump diaphragm for Motorcraft 2150 to restore pump function (AP171)
- Material / Construction:Rubber diaphragm (AP171) — brand new, susceptible to ethanol wear notes
- Pump Capacity / Size (where specified):(Stem length specified 7/8″; capacity not stated — Motorcraft AP171)
- Installation / Fit Ease:Direct replacement for AP171; brand-new — simple swap (note ethanol wear)
- Durability / Resistance:Brand new but notes susceptibility to ethanol (recommend spare units) — generally durable rubber but ethanol may accelerate wear
- Additional Feature:7/8″ stem length
- Additional Feature:Fits 1979–1989 Wagoneer
- Additional Feature:Ethanol wear warning
135-7 50cc Accelerator Pump Diaphragm for Holley Carburetors
Should you want reliable throttle response and a direct replacement for Holley carburetors, the 135-7 50cc accelerator pump diaphragm is built for you. You’ll find it fits Holley 2300, 4150, 4160, and 4500 models, for both 2-barrel and 4-barrel setups. It’s made through SeaEagles as a genuine OEM style part, painted for protection, and sized to deliver the correct 50cc fuel shot. Installation is straightforward, so you can swap it quickly and get back on the road. The part feels durable, supports smooth acceleration, and comes with warranty and return options should you require them.
- Compatibility / Fitment:Holley 2300, 4150, 4160, 4500 carburetors (50cc, 135-7)
- Function / Purpose:50cc accelerator pump diaphragm to provide correct pump fuel volume and improve response
- Material / Construction:High-quality rubber/material diaphragm (50cc, OEM replacement)
- Pump Capacity / Size (where specified):50cc (135-7)
- Installation / Fit Ease:OEM-style replacement; easy installation for proper function
- Durability / Resistance:Constructed with high-quality materials for durability and long-lasting performance
- Additional Feature:50cc pump capacity
- Additional Feature:Compatible with 4500 series
- Additional Feature:Manufacturer warranty available
Accelerator Pump Diaphragm Kit for Holley Carburetors
Assuming you want smooth, responsive throttle and worry-free daily driving or off-road fun, this Accelerator Pump Diaphragm Kit for Holley carburetors is a top pick for you. You’ll get precise fuel delivery that cuts lag and makes acceleration feel natural. It fits Holley 2300, 4150, 4160, and 4500 models in 2-barrel and 4-barrel setups, replacing part 135-7 with a 50cc capacity. The kit resists oil and high heat, so it lasts and seals tightly to prevent leaks. Installation is simple, needs no special tools, and comes as four pieces so you can fix more than one carburetor.
- Compatibility / Fitment:Holley 2300, 4150, 4160, 4500 carburetors (50cc, replaces 135-7)
- Function / Purpose:Accelerator pump diaphragm kit (50cc) for precise fuel delivery and improved throttle response
- Material / Construction:Oil- and heat-resistant rubber/material diaphragms (durable)
- Pump Capacity / Size (where specified):50cc (135-7 kit, 4 pieces)
- Installation / Fit Ease:Simple installation; no complex tools required (pack of 4)
- Durability / Resistance:Oil- and high-temperature resistant; long service life and wear-resistant
- Additional Feature:50cc replacement capacity
- Additional Feature:Pack of four pieces
- Additional Feature:High oil-temperature resistance
Factors to Consider When Choosing Carburetor Accelerator Pumps
Once you pick an accelerator pump, start considering material durability and resistance because a tougher pump lasts longer and stands up to fuel and heat. Next check fitment and compatibility along with sealing to prevent leaks, and consider pump volume and capacity since they directly affect throttle response performance. As you compare options, focus on how these factors work together so you get reliable, smooth acceleration without surprises.
Material Durability And Resistance
Durable materials matter a lot whenever you pick a carburetor accelerator pump, because the right parts keep your engine responsive and save you from breakdowns. You should choose diaphragms made from fuel-resistant elastomers like Viton or high-grade nitrile since they stay elastic under heat and resist swelling from gasoline and ethanol blends. Check temperature ratings and aim for stability well above typical engine bay temps, for example over 150°C, so parts won’t harden or crack. Also pick metal parts with corrosion-resistant finishes such as stainless steel or plated alloys to stop pitting and seizure from fuel and moisture. Look for proven aging resistance and fuel chemical resistance, plus good abrasion and pressure specs so the diaphragm keeps sealing and metering on repeated quick throttle moves.
Fitment And Compatibility
You’ve picked parts that will stand up to heat and fuel, and now you need to make sure they actually fit your carburetor and work the way the engine expects. Initially, match the pump or diaphragm to the OEM part number or exact model family like Holley 4150 or 2300 so sealing and fit stay correct. Also check stem length and mounting hole pattern so the pump clears linkages and seats without leaks. Pay attention to materials and thickness so the diaphragm nests in the cavity and keeps factory stroke and return. Whenever you consider universal or cross reference parts, compare exact dimensions and OEM references rather than assuming fit based on year or engine type. Match capacity to housing size.
Pump Volume And Capacity
Pick the right pump volume to give your engine the quick, clean shot of fuel it needs as you crack the throttle. You want a pump size that fits your engine size, cam profile, and carb bore. Smaller pumps work well on street cars and light-load use because they keep transitions smooth and emissions cleaner. Bigger pumps suit larger displacement engines, high-lift cams, or race use since they stop hesitation on wide throttle openings. Also know that changing pump volume will change the air fuel balance, so you’ll likely need to rejet or tweak main and idle circuits. Consider how you drive, match capacity to duty, and be ready to tune after swapping pumps to keep drivability tight.
Sealing And Leak Prevention
Leaks can sneak up on you, so pay close attention to the parts that keep the pump sealed and working right. You want diaphragms and pump cups made from fuel-resistant elastomers like nitrile or Viton so they don’t swell or crack with gasoline and ethanol blends. Check that replacement parts have precise sealing lips and uniform thickness so gaps don’t form and leaks don’t develop slowly. Inspect mating surfaces and fit correct-size O-rings or gaskets with compatible durometer ratings to avoid compression set and seepage under pressure. Also confirm metal housings and fasteners resist corrosion and are free of burrs or warping since surface flaws ruin seals. After installation, run a pressure or vacuum leak test and watch for seepage and steady diaphragm motion.
Throttle Response Performance
Upon opening the throttle and expecting an immediate surge, the accelerator pump is the part that makes that promise real, so you need to pick one whose volume, responsiveness, and stroke behavior match your engine’s needs. You’ll look at pump volume initially since larger volumes like 30 to 50 cc give more instant fuel on tip-in and cut lean hesitation. Then check diaphragm responsiveness; a fresh, elastic diaphragm reacts fast while stiff or aged material causes lag. Also consider stroke length and spring rate because shorter strokes with firmer springs make crisper pulses, while longer, softer strokes smooth delivery but slow response. Tight seals and precise tolerances stop air and leaks that ruin instant delivery. Finally, match capacity and response to displacement, cam, and linkage to avoid bogging or stumble.
