Accelerator Pump Kit

Accelerator Pump Kit: fix the flat spot off idle

An accelerator pump kit restores the shot of raw fuel your carburetor squirts every time you crack the throttle. When you snap the throttle open, airflow jumps instantly but fuel lags behind - the accelerator pump covers that gap with a metered squirt so the engine doesn't stumble, bog, or die on the transition. When the diaphragm hardens, the boot cracks, or the check valve stops sealing, you get a flat spot right off idle. A rebuild kit gets the squirt back without pulling the whole carb apart.

What we stock

There are 10 accelerator pump kits and rebuild parts here, spanning 5 brands: Bikers Choice, S&S Cycle, QuadBoss, All Balls Racing, and TwinPower. Prices run from $31 to $92, which is the current range on what's in stock rather than a fixed quote. Coverage in the product data centers on carbureted bikes and ATVs, with fitment naming Honda, Yamaha, and Polaris across model years roughly 2004-2014 - vehicles like the Honda CRF150R, Yamaha YFZ450, and Polaris Outlaw 450. On the V-twin side, S&S carb owners will find the S&S Cycle Super E/G rebuild kit.

How to choose

The split here is between full rebuild kits and single service parts. A rebuild kit is the right call when you want to refresh everything at once - diaphragm, boot, seals - and be done. If you already know the exact failed piece, a single part is cheaper: the Keihin accelerator pump boot covers a cracked boot, while the Keihin butterfly/CV diaphragm is sold as a 10-pack, which sits at the top of the price range for that reason. Match the kit to your carb family - Keihin butterfly and CV setups, S&S Super E/G, or the ATV-specific QuadBoss and All Balls Racing kits - not just to your vehicle.

What else you may need

Since the carb is already open, it's a good time to check the rest of the fuel path. Look at Gasket Kits if you're splitting float bowls or cases, and Fuel Pumps if fuel delivery is soft further upstream. For plumbing, browse Fittings and Adapters. All of these live under the broader Engine Components section, alongside Oil Filters for routine service.

Fitment and ordering

Only some kits carry detailed year-and-model fitment, so confirm your carburetor type before buying - the part must match your carb, not only your bike or quad. If you're unsure, call fitment help at 813-535-5801 or reach us through Contact Us. Every order ships with free shipping, and Affirm and Katapult financing is available through our financing options.

Accelerator Pump Kit: fix the flat spot off idle

An accelerator pump kit restores the shot of raw fuel your carburetor squirts every time you crack the throttle. When you snap the throttle open, airflow jumps instantly but fuel lags behind - the accelerator pump covers that gap with a metered squirt so the engine doesn't stumble, bog, or die on the transition. When the diaphragm hardens, the boot cracks, or the check valve stops sealing, you get a flat spot right off idle. A rebuild kit gets the squirt back without pulling the whole carb apart.

What we stock

There are 10 accelerator pump kits and rebuild parts here, spanning 5 brands: Bikers Choice, S&S Cycle, QuadBoss, All Balls Racing, and TwinPower. Prices run from $31 to $92, which is the current range on what's in stock rather than a fixed quote. Coverage in the product data centers on carbureted bikes and ATVs, with fitment naming Honda, Yamaha, and Polaris across model years roughly 2004-2014 - vehicles like the Honda CRF150R, Yamaha YFZ450, and Polaris Outlaw 450. On the V-twin side, S&S carb owners will find the S&S Cycle Super E/G rebuild kit.

How to choose

The split here is between full rebuild kits and single service parts. A rebuild kit is the right call when you want to refresh everything at once - diaphragm, boot, seals - and be done. If you already know the exact failed piece, a single part is cheaper: the Keihin accelerator pump boot covers a cracked boot, while the Keihin butterfly/CV diaphragm is sold as a 10-pack, which sits at the top of the price range for that reason. Match the kit to your carb family - Keihin butterfly and CV setups, S&S Super E/G, or the ATV-specific QuadBoss and All Balls Racing kits - not just to your vehicle.

What else you may need

Since the carb is already open, it's a good time to check the rest of the fuel path. Look at Gasket Kits if you're splitting float bowls or cases, and Fuel Pumps if fuel delivery is soft further upstream. For plumbing, browse Fittings and Adapters. All of these live under the broader Engine Components section, alongside Oil Filters for routine service.

Fitment and ordering

Only some kits carry detailed year-and-model fitment, so confirm your carburetor type before buying - the part must match your carb, not only your bike or quad. If you're unsure, call fitment help at 813-535-5801 or reach us through Contact Us. Every order ships with free shipping, and Affirm and Katapult financing is available through our financing options.