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Old 05-28-2014, 10:04 AM   #1
Brian2006
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How to check compression on pulled motor?

What's the best way to check compression on a motor already pulled from a bike? It's a K9 600 motor. I have a compression gauge for the spark plug hole, but unsure the best method to turn the crank without using the starter. Also, how much compression should this motor have? Thanks!
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Old 05-28-2014, 10:26 AM   #2
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bolt on the starter and hit it with 12v
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Old 05-28-2014, 11:21 AM   #3
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Quote:
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bolt on the starter and hit it with 12v
This.
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Old 05-28-2014, 11:52 AM   #4
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Sorry for the ignorance but, could you elaborate? I know where the stator is but obviously I'm a little confused which "bolt on the starter" you speak of. Could I just send 12v power to the wiring harness from the stator?
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Old 05-28-2014, 11:58 AM   #5
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and how is that going to spin the crank? Put the STARTER on it, bolt it up, and let the starter spin the engine over
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Old 05-28-2014, 12:32 PM   #6
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Put the tools down.
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Old 05-28-2014, 12:34 PM   #7
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The stator doesnt spin the motor. The motor spins the stator just like a generator. Powering the harness will do nothing positive towards your goal.
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Old 05-28-2014, 12:45 PM   #8
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stator starter. . .potato pototo
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Old 05-28-2014, 12:49 PM   #9
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they both spin right?
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Old 05-28-2014, 12:59 PM   #10
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Quote:
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they both spin right?
Last time I checked. . .but only one of them is going to move the pistons up/down in the cylinder in order to check the compression.
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Old 05-28-2014, 01:29 PM   #11
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Quote:
Originally Posted by Brian2006 View Post
What's the best way to check compression on a motor already pulled from a bike? It's a K9 600 motor. I have a compression gauge for the spark plug hole, but unsure the best method to turn the crank without using the starter. Also, how much compression should this motor have? Thanks!
Basically what they're getting at is that you HAVE to use the starter. However, you don't have to use the full wiring system to make it crank, simply hook up a 12V battery with jumper cables. Negative to ground on the engine, positive to the post where your starter solenoid cable would connect. You control how long the starter spins by how long you hold the (+) cable on the starter terminal.
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Old 05-28-2014, 01:30 PM   #12
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Quote:
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they both spin right?

umm... I don't believe the stator spins, I believe that the rotor spins and the stator is stationary, but I could be wrong on my terminology.
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Old 05-28-2014, 01:32 PM   #13
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Quote:
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umm... I don't believe the stator spins, I believe that the rotor spins and the stator is stationary, but I could be wrong on my terminology.
You are right. You have found the hole in my joke
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Old 05-28-2014, 02:49 PM   #14
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Quote:
Originally Posted by Jae View Post
Basically what they're getting at is that you HAVE to use the starter. However, you don't have to use the full wiring system to make it crank, simply hook up a 12V battery with jumper cables. Negative to ground on the engine, positive to the post where your starter solenoid cable would connect. You control how long the starter spins by how long you hold the (+) cable on the starter terminal.
Thanks for being one of the few respectful posts in here . This helps.

Back to my second question. Anyone know what PSI the pistons should read? Or maybe someone with a shop manual that could look it up? Couldn't find much on google.
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Old 05-28-2014, 02:52 PM   #15
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160-180 and make sure they are all "similar".
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Old 05-28-2014, 02:52 PM   #16
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Quote:
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Thanks for being one of the few respectful posts in here . This helps.

Back to my second question. Anyone know what PSI the pistons should read? Or maybe someone with a shop manual that could look it up? Couldn't find much on google.
At least 150psi depends on camshaft. Compression ratio ect.
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Old 05-28-2014, 03:11 PM   #17
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Great, Thanks!
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Old 05-28-2014, 03:13 PM   #18
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Few respectful posts? wtf?
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Old 05-28-2014, 03:21 PM   #19
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Few respectful posts? wtf?
My bad.
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