Gen 4: 2011-2015 psi testing new OEM gen 4 zx-10r intake valve springs - Kawasaki ZX-10R.net
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post #1 of 3 Old 08-16-2019, 07:46 AM Thread Starter
Squid
 
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psi testing new OEM gen 4 zx-10r intake valve springs

I just performed psi testing on two sets of new OEM gen 4 zx-10r intake valve springs that were purchased from two different suppliers at different times during the past six months. The psi for each spring at full valve open position was as expected; however, the free travel to full coil bind was between 0.050 to 0.060 inches and I expected higher free travel numbers. Prior to testing the psi of each intake spring, I was considering adding 0.015 shims to help mitigate high rpm valve float; however, given the free travel numbers I got, I'm not sure that adding 0.015 shims is a good idea. Any thoughts on adding the 0.015 shims?
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post #2 of 3 Old 08-16-2019, 08:15 AM
gaz
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add the shims, valve springs can be shimmed to within .030 of coilbind safely. high revving bikes are set tight from factory. reason i had mentioned most common .030 shims little much. well known lsr engine builder working with the tens several years ago told me to shim the springs, worth about 400 rpm before valve float. u are safe. good job measuring spring heights, about same as i've found.
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Last edited by gaz; 08-16-2019 at 08:21 AM.
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post #3 of 3 Old 08-16-2019, 09:40 AM Thread Starter
Squid
 
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Thanks much gaz. U da man. I've done my share of mechanical work but very little valvetrain stuff. I'm a bit surprised at how long it's taking me to get things done.

I also measured an older used set of used intake valve springs and free travel came in at between 0.080 and 0.090. That seemed to be more in line with other data I've seen on the intake valves. Made me wonder whether Kawi changed the spec on the springs at some point or who knows what else. Lack of experience and knowledge = lots of questions, pondering and time ha ha.

I really appreciate your help Gaz.
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