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techtalk:evo:carb06f [2019/08/27 15:31]
hippysmack created
techtalk:evo:carb06f [2019/08/27 22:35] (current)
hippysmack [To Drill or Not to Drill the Keihin CV Carb Vacuum Slide Hole]
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 Drilling the vacuum slide hole is supposed to give you quicker throttle response. \\ Drilling the vacuum slide hole is supposed to give you quicker throttle response. \\
 +It's also the first thing the instructions say to do in a DynoJet kit. \\
 +("//​Remove the vacuum slide from the carb. Remove the stock needle & spacers, noting the order of assembly. Locate the slide lift hole. With drill bit provided (DD #29) enlarge your slide lift hole//) \\ 
   * As the larger port reduces air pressure above the diaphragm quicker, so the slide rises quicker. ((Folkie of the XLFORUM ​ http://​xlforum.net/​forums/​showthread.php?​t=1937640&​page=3)) \\ The problem is that it is easy to overdo it, and make the port too large. \\ This makes the slide rise too quickly, and possibly overshoot the proper position. \\ You can get the slide '​hunting'​ around, back and forth above and below the '​correct'​ position (ie: that which gives the required constant depression).   * As the larger port reduces air pressure above the diaphragm quicker, so the slide rises quicker. ((Folkie of the XLFORUM ​ http://​xlforum.net/​forums/​showthread.php?​t=1937640&​page=3)) \\ The problem is that it is easy to overdo it, and make the port too large. \\ This makes the slide rise too quickly, and possibly overshoot the proper position. \\ You can get the slide '​hunting'​ around, back and forth above and below the '​correct'​ position (ie: that which gives the required constant depression).
   * The problem with making it too large, is that you can't make it smaller again. \\ If you end up with a too large hole, the only solution is to get a new slide and diaphragm.   * The problem with making it too large, is that you can't make it smaller again. \\ If you end up with a too large hole, the only solution is to get a new slide and diaphragm.