There are many small items that go into prepping a powerful reliable stock CR125 engine for shifter kart racing. One item that is optional for stock engines under SKUSA rules is the reeds. There was a favorite reed setup for the 2001 and 2002 reed cages previously allowed by SKUSA, but what about the 1999 reed cages mandated for 2010 competition? Do the type and style of reeds really make a difference on the 1999 reed cage? SRS decided to find out by running dyno tests on a wide range of reed combinations, thicknesses, and shapes. The tests were quite enlightening.
Although the stock reeds are surprisingly powerful, combinations of shape, thickness, construction absolutely make a power difference. However, one really surprising result is that most of the special combinations tried were more durable than the stock reeds during the tests. Some of these combinations are less powerful than stock and some produce more power than stock. Through a process of trial and error a reed setup emerged as the best performance setup. It is named the SRS Engines Dyno Select reed setup.
The SRS Engines Dyno Select reeds were completely reliable during testing and produced and average of about ½ horsepower more that the stock reed setup from 11200 to 12400. That is passing power.
Written on Saturday, 27 March 2010 07:39 by John Sefcik
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