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Old 02-06-2008, 06:51 PM   #1
lilmckee
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GSXR 600 Compression Test

01-03 GSX-R stock motor

I'm running a compression test here soon...

What should the psi be at?

Thanks
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Old 02-06-2008, 07:36 PM   #2
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the same across all of them
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Old 02-06-2008, 07:56 PM   #3
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have you been to gixxer.com? or gixxerplanet?
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Old 02-06-2008, 08:10 PM   #4
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not for a long time, not a fan

just thought I start here first
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Old 02-06-2008, 09:02 PM   #5
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It varies, I'll have to check the factory service manual, but for some reason, 120psi comes to mind as the top of the range. The key is that (as mentioned) all 4 are the same.
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Old 02-06-2008, 09:17 PM   #6
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160 - 180 for a healthy engine.
However depending on the quality of your gauge you may read more or less.

What's more important is that they're even all of the way across, also don't forget to hold the throttle wide open when doing the test.
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Old 02-06-2008, 09:34 PM   #7
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Appreciate the help maskale, tom, and pat.
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Old 02-06-2008, 09:45 PM   #8
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I have read to do it both ways, plugs in, and plugs out.

but I do it with the other plugs out, with the other plugs in your starter is having to fight the compression, with them out you will get a higher reading.

if you have the time do it both ways and see what you get.


see what other here think about the plugs being in or out.
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Old 02-06-2008, 09:47 PM   #9
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good point I didn't even think about that.

I've always did it with plugs in with cars



But I have plenty of time on my hands so I'll do both

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Old 02-06-2008, 10:06 PM   #10
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Without the manual in front of me, I would guess the lowest should be 160psi or so....probably really around 180psi. Make sure you hold the throttle wide open during testing....also test it warm if possible. NO more then 10% variance between cylinders.
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Old 02-07-2008, 12:39 AM   #11
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Quote:
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Without the manual in front of me, I would guess the lowest should be 160psi or so....probably really around 180psi. Make sure you hold the throttle wide open during testing....also test it warm if possible. NO more then 10% variance between cylinders.
Patrick, you hear an echo in here?



I'd recommend taking all plugs out, not just the one you're testing. My opinion is that it takes all the load off the engine and will give you a truer compression reading while testing.
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Old 02-07-2008, 08:12 AM   #12
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Quote:
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Patrick, you hear an echo in here?



I'd recommend taking all plugs out, not just the one you're testing. My opinion is that it takes all the load off the engine and will give you a truer compression reading while testing.

did I double post? LOL

Great minds think a like.
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Old 02-07-2008, 01:07 PM   #13
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thanks zx
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