They do not crack, harden, and break like o-rings do.
In addition stronger pump springs are also available to solidly actuate the pump and prevent hydraulic lag. Replacement parts are available, please inquire. Fits ALL Keihin FCR carburetors including the OEM models.Offers instant throttle response while eliminating bogging.High volume check valve for precise, consistent metering Boyesen Quickshot 3 Accelerator Pump Cover.Cast and machined to precise tolerances.Maximizes volume and duration of fuel squirt for all conditions.Boyesen Supercooler Water Pump Cover and Impeller Kit 189.95. The Boyesen Quickshot pumps offer the following features: Boyesen Quickshot 3 Performance Accelerator Cover 111.96. This all combines to provide superior throttle response over non-adjustable pumps. The design also provides an anti-cavitation fuel chamber that has been proven to eliminate any air pockets thereby allowing the diaphragm to work at maximum efficiency. Works with ALL Keihin FCR and FCR-MX carburetors including OEM style FCR carburetors. With the constant on/off/on throttle chopping on Motocross bikes, the Quick shot pump allows a volume to be dialed in that won't flood the engine with excess fuel. It allows you adjust the volume of fuel that is injected into the venturi in order to provide a "perfect" pump squirt. The Quick shot 3 is a "True" adjustable accelerator pump with an adjustable leak circuit. I don't have a picture but can try to get one.The patented Boyesen Quickshot 3 adjustable accelerator pump cover packs a ton of technology into a small package. Pretty good for something over 100 years old. Threading Quick change box seems to be like never used and it came with a Taper attachment that is like new. I kind of like the idea of paying for the machine again every time a big job is done to. The big chuck will not fit if the headstock is lower. I have not decided if it should be put back to a 24" swing.
The result: Hesitation, bog and a tuning headache. All the while tuning the squirt means a complicated change of the leak jet. Turn the throttle and air trapped in the chamber is compressed disrupting fuel delivery. Stock accelerator pump covers permit only a 60 - 70 fuel charge in the pump chamber. My lathe has the motor mounted on the head stock so no flat belts which for 1902 was pretty advanced. QuickShot 3 Adjustable Pump Cover by Boyesen. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship, Manufactured from industry-leading materials using up-to-date equipment, it ensures everlasting reliability and enduring value, This product is distinguished by total quality. QuickShots patent pending design eliminates hesitation and bog on bikes and ATVs and provides instant response to throttle movements Additional benefits. My guess would be there are very few hours on this machine QuickShot 3 Adjustable Pump Cover by Boyesen. The fellow that I bought it from paid about $500.00 for it out of a old shop near the Union Pacific shops and he sold it to me for $500.00 to get moved and I think I done a couple jobs which paid for the machine. Some one put Risers blocks under the head stock & Tail stock and tool post so this lathe came with a 30" 4-jaw chuck which makes an pretty big machine. Schumaker&Boye was started 1899 and changed names in 1912. I have a 24" x 84" Schumacher & Boye Double Back Gear Engine Lathe with the Headstock Mounted Motor and w/ the Quick Change screw cutting gear box which according to is about MFG.
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