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Bought a non running f4i, did a compression test and these are the #'s

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Bought a non running f4i, did a compression test and these are the #'s

  #1  
Old 06-01-2015, 09:39 PM
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Default Bought a non running f4i, did a compression test and these are the #'s

So I bought a non running f4i, owner stated that it has 12k miles, title says it has 3700. It has been dropped a few times, which is apparent with all of the bent levers and pedals. Stator cover is so badly scratched its cracked and PO slapped a bunch of gasket maker on it to prevent leaking. I got it for a really good price, just missing some hardware for the fairings and the rear seat and some other small things.

anyways, I didnt have a battery to do a compression test it and went ahead and pulled all of the spark plugs out. I was able to get a compression tester into each cylinder and since I couldnt crank the engine.. drum roll..... I ended up putting a ratchet and socket onto the crankshaft bolt (is that what is under the stator cover? )

So I manually spun the crap out of the engine for each cylinder and came up with these number (unsure of accuracy)

Cylinder 1: 125
Cylinder 2: 130
Cylinder 3: 130
Cylinder 4: 125

There isnt much deviation between each cylinder and I feel good about the numbers but I would look some opinions about what im working with to confirm that I have at least a decent engine. Thanks for your input in advance
 
  #2  
Old 06-01-2015, 11:09 PM
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Those numbers are low, but that's to be expected since you turned it by hand.
To do it accurately, the motor needs to turn much faster.
 
  #3  
Old 06-01-2015, 11:22 PM
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Yes I also concluded that as well. I've read that rr's are around 178psi warm, are the f4i's about the same? Me and a buddy were laughing after I told him I know how the starter motor feels heh
I will retest next week when I get all of the fluids changed, other pertinent parts installed and a fresh battery in
 
  #4  
Old 06-06-2015, 05:39 PM
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thats actually pretty damn good considering you were cranking it by hand. doing the test properly you should get 160-170 if i remember correctly
 
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