Shimming question - Kawasaki Ninja 250R Forum
 
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post #1 of 7 (permalink) Old 06-07-2013, 12:15 AM Thread Starter
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Question Shimming question

I recently installed a K&N air filter to my 2012 ninja 250 since installing a more breathable filter should I shim my carbs? Will it increase my throttle response? And should I remove snorkle completely or trim down the snorkle a few inches?
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post #2 of 7 (permalink) Old 06-07-2013, 04:07 AM
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.... Shim the needles with (2) two 3mm washers and remove the snorkel. Shims add a little bit more fuel to the 1/4-3/4 throttle range, a little more fuel results in better throttle response-(simple, don't complicate it)(If you have a slip on exhaust removal of the kleen air system is optional if you don't mind the popping.)
Shortening the snorkel does very little. Either leave it in without the shims or completely remove it when you add the shims.
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post #3 of 7 (permalink) Old 06-07-2013, 12:16 PM Thread Starter
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OK I shimmed the needles with 2 washers reassembled the bike and now it only wants to run in prime. Or its will only run when choked fully.what went wrong I'm still running stock exhaust
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post #4 of 7 (permalink) Old 06-07-2013, 12:34 PM Thread Starter
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OK I shimmed the needles with 2 washers reassembled the bike and now it only wants to run in prime. Or its will only run when choked fully.what went wrong I'm still running stock exhaust
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post #5 of 7 (permalink) Old 06-07-2013, 12:56 PM
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OK I shimmed the needles with 2 washers reassembled the bike and now it only wants to run in prime. Or its will only run when choked fully.what went wrong I'm still running stock exhaust
What size washers did you use and did you install them correctly? If the washers are too big, shimming does not work. The washers need to be small enough to fit inside the white plastic spring seat.
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post #6 of 7 (permalink) Old 06-07-2013, 01:00 PM Thread Starter
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Went to radio shack they had a variety pack of #2,4,6,8 & 10 I used a #4
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post #7 of 7 (permalink) Old 07-15-2013, 06:54 PM
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I had the same problem, I shimmed the carbs and it only ran with full choke. We had to twist the idle adjustment screws to 2 and a half turns and rebuild/clean the carbs. Worked after that
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