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March 28th, 2018, 08:15 PM   #1
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True compression test info please

Hi folks
Im looking to purchase a still in bike 06' FE650 engine & want to know the compression.
The owner did it & got 60lbs & is thinking its due to the auto compression release.
How can this be done so I can get a real reading ?

Also if this is a tight engine does 2k US sound fair ? Is not including carb, cdi, exhaust or kick starter jfyi.

Thanks in advance ---Proflow

Last edited by proflow; March 29th, 2018 at 05:20 PM.
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March 29th, 2018, 05:21 PM   #2
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Nobody ?
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March 30th, 2018, 04:25 AM   #3
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Good question! I don't know the answer, but maybe there's something in the manuals. Do you see the links in my signature? Those are tons of manuals here on the forum and some more on our google drive. (Links in sig are hard to see on mobile.)
Thanks from proflow
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April 2nd, 2018, 09:50 AM   #4
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Do a leak-down test and see how it holds, Also a compression test will work as the gauge has a lock off and will climb at each kick. it should build pressure over about 5 kicks and give a reading.

Last edited by FE350; April 2nd, 2018 at 09:57 AM.
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April 2nd, 2018, 09:59 AM   #5
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Leak down is the way to go. You really can't get an accurate reading with auto-decomp. I'm all ears for anyone that has a way around it.
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April 2nd, 2018, 05:55 PM   #6
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Thanks for the replys,

So how do you guys feel about $2000 US for a FE 650 running engine ?
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April 3rd, 2018, 11:15 AM   #7
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kinda spendy for just a motor.
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