All your engine questions here...... - Page 21 - Suzuki GSX-R Motorcycle Forums Gixxer.com

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post #401 of 404 (permalink) Old 03-25-2019, 07:34 AM
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Re: All your engine questions here......

Use the OEM CR9E,you are gaining zero performance and throwing money away for nothing.
Verify the coil is firing on that cylinder,if it is...then see below

If the plug looks as described,consider doing a compression or leak-down test on that cylinder.
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post #402 of 404 (permalink) Old 03-25-2019, 07:38 AM
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Ok I'll do that tonight ..... Honestly didn't even know I was buying a "performance" plug at first..... I'll update soon!!
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post #403 of 404 (permalink) Old 03-25-2019, 07:38 AM
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Any idea how much psi those cylinders should hold?
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post #404 of 404 (permalink) Old 03-25-2019, 07:48 AM
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Re: All your engine questions here......

You'll have to source a FSM and verify the numbers or maybe one of our members knows off the top of their head,I don't know what they should be....but you can check all 4cyls and they should all be within 5-10% of one another. So if 3 cyls are between 140-150psi and one is 110 then you know whats up.
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