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| techtalk:ih:carb01r [2023/12/29 22:29] – hippysmack | techtalk:ih:carb01r [2025/02/10 17:08] (current) – [Andrews High Flow Accelerator Pump (Keihin butterfly)] hippysmack | ||
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| ===== Andrews High Flow Accelerator Pump (Keihin butterfly) ===== | ===== Andrews High Flow Accelerator Pump (Keihin butterfly) ===== | ||
| - | 79-up 34mm Keihin carbs will not fill there accelerator pumps as quickly as the 76-78 38mm ones. ((Joe Minton Article " | + | Andrews Products |
| - | The earlier pump would refill in about 1/2 second. The later one takes three seconds. \\ | + | {{: |
| - | The earlier pump will allow you to get by the choke and will help you catch the engine if you let the clutch out too fast at a red light. \\ | + | |
| - | The main difference is the pump housing. The early accel pump passages had both an inlet and an outlet hole for gas routing. \\ | + | |
| - | The Andrews pump is reportedly the same as Harley | + | |
| - | Actually, if you can find a 38mm pump and drill the hole in your carb body, you'll have the old style accel pump. \\ | + | |
| - | On 1980-1988 Keihin carbs, the stock accelerator | + | 79-up 34mm Keihin carbs will not fill there accelerator |
| - | The result | + | The earlier pump would refill in about 1/2 second. The later one takes three seconds.\\ |
| + | The earlier pump will allow you to get by the choke and will help you catch the engine if you let the clutch out too fast at a red light.\\ | ||
| + | The main difference | ||
| + | The Andrews pump is reportedly the same as Harley part (27364-76) for the early 38mm Keihins.\\ | ||
| + | Actually, if you can find a 38mm pump and drill the hole in your carb body, you'll have the old style accel pump. | ||
| - | The Keihin | + | On 1980-1988 |
| - | There is one on the [[https:// | + | Not intended for 1989 and later CV carburetors. \\ |
| - | It has a V-twin part number of 35-9050, Manufacturer Keihin, Part Number: 269050. \\ | + | |
| - | // | + | |
| - | Makes since as Andrews used to make the Flowmaster carb. \\ | + | |
| - | The pump is listed as out of stock and has been since at least of march 2018 yet the listing is still up. \\ | + | |
| - | In fact and according to the V-twin website, it's been discontinued and no replacement is listed. \\ | + | |
| - | Installation instructions from Andrews | + | The Keihin butterfly carb already has an accelerator pump, so the Andrews |
| - | Features: ((http:// | + | The Flowmaster carb accelerator pump kit improves throttle response on Keihin carburetor models with a greater volume of fuel from the pump circuit. Makes since as Andrews used to make the Flowmaster carb.\\ |
| + | The pump is listed as out of stock and has been since at least of march 2018 yet the listing is still up.\\ | ||
| + | In fact and according to the V-twin website, it's been discontinued and no replacement is listed. \\ | ||
| + | |||
| + | Features: ((http:// | ||
| * Improves throttle response | * Improves throttle response | ||
| * Larger fuel volume/ | * Larger fuel volume/ | ||
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| * Dimensions: 5" | * Dimensions: 5" | ||
| - | A high flow accelerator pump is also a great all around upgrade for these carbs. ((oldnavy of the XLFORUM https:// | + | A high flow accelerator pump is also a great all around upgrade for these carbs. ((oldnavy of the XLFORUM https:// |
| - | {{: | + | |
| - | **How the High Flow Accelerator Pump should be installed**: | + | **How the High Flow Accelerator Pump should be installed**: |
| - | High Flow Accelerator Pump for Stock Keihin Carburetors For Stock Keihin Carbs from 1980-1988)) | + | |
| - Remove float bowl from carburetor. There are four screws holding it in place. \\ It is not necessary to remove the entire carburetor from the engine to install your new high flow accelerator pump. | - Remove float bowl from carburetor. There are four screws holding it in place. \\ It is not necessary to remove the entire carburetor from the engine to install your new high flow accelerator pump. | ||
| - | - Clean any fuel residue from the bowl assembly and remove the stock accelerator pump housing. \\ It is held in place with three screws but one of them already has been removed with the bowl. | + | - Clean any fuel residue from the bowl assembly and remove the stock accelerator pump housing. \\ It is held in place with three screws but one of them already has been removed with the bowl. |
| - Position the bowl upside down for drilling a single hole through the bottom. | - Position the bowl upside down for drilling a single hole through the bottom. | ||
| - | - Any drill of approximately 1/16 diameter will be quite satisfactory. \\ The exact location for this hole is already marked with a dimple on the bottom of the float bowl casting as shown in photo below. \\ {{: | + | - Any drill of approximately 1/16 diameter will be quite satisfactory. \\ The exact location for this hole is already marked with a dimple on the bottom of the float bowl casting as shown in photo below. \\ {{: |
| - Feed the drill through until it breaks out into the float chamber. \\ Don’t worry if the hole breaks into either a cross drilled passage or through the actual bottom of the bowl. \\ The location is not critical as long as fuel can feed through into the accelerator pump. | - Feed the drill through until it breaks out into the float chamber. \\ Don’t worry if the hole breaks into either a cross drilled passage or through the actual bottom of the bowl. \\ The location is not critical as long as fuel can feed through into the accelerator pump. | ||
| - Thoroughly clean any drill chips from the bowl. There is a small bypass hole in the bottom of the bowl which does not have to be plugged. \\ Several earlier magazine articles have recommended plugging this hole but there will be no measurable benefit from doing so. | - Thoroughly clean any drill chips from the bowl. There is a small bypass hole in the bottom of the bowl which does not have to be plugged. \\ Several earlier magazine articles have recommended plugging this hole but there will be no measurable benefit from doing so. | ||
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| - If the accelerator pump jet needs to aimed differently, | - If the accelerator pump jet needs to aimed differently, | ||
| - Reinstall the bowl and pump assembly back onto the carburetor body to complete the job. \\ The extra fuel from the larger capacity pump should result in smoother, quicker throttle response especially off idle or at low RPM. | - Reinstall the bowl and pump assembly back onto the carburetor body to complete the job. \\ The extra fuel from the larger capacity pump should result in smoother, quicker throttle response especially off idle or at low RPM. | ||
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| ===== Alternative using CV accelerator pump ===== | ===== Alternative using CV accelerator pump ===== | ||
