EVO All Evo Model Discussion

getting ready to "push the button"

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Old Jan 19, 2013 | 05:33 PM
  #101  
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I just took the pushrod covers off. I could spin all but one of them with my fingers.

Does that mean they are too loose?
 
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Old Jan 19, 2013 | 05:37 PM
  #102  
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Cranking and engine that much will wash the cylinders, and you lose the ring seal. That is probably why your compression is so low. If you corrected an ignition issue, now it may not be drawing fuel in properly to run. A squirt or two of oil down each spark plug hole will boost the compression to help the engine draw in the fuel charge.
 
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Old Jan 19, 2013 | 05:37 PM
  #103  
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You do have to have the throttle wide open when checking compression. Also, I would put a little oil in the cylinders through the spark plug holes. Then if you only have 80 or less your valves are not fully closing or they are leaking for some reason. With oil in the cylinders, and wide open throttle, you should get over a hundred I would think.
 
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Old Jan 19, 2013 | 05:38 PM
  #104  
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No, they'll bleed down after sitting a few minutes. How many turns do you turn them out from bottom? I know threads are different for different makers, like SE is 25 tpi, 2 1/2 turns. My Taper Lites are higher, something like 40 tpi, 4 turns out. When you turned it over in your video I couldn't hear any popping like I hear in mine, the compression. Maybe it was just the location of your phone.
 
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Old Jan 19, 2013 | 06:11 PM
  #105  
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Originally Posted by Jim Kraft
You do have to have the throttle wide open when checking compression. Also, I would put a little oil in the cylinders through the spark plug holes. Then if you only have 80 or less your valves are not fully closing or they are leaking for some reason. With oil in the cylinders, and wide open throttle, you should get over a hundred I would think.
I definitely did NOT have the throttle open when I checked the compression.

I am in the process of re-adjusting the push rods. I removed them to make sure they weren't bent.
 
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Old Jan 19, 2013 | 06:19 PM
  #106  
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Whats the compression readings, sounds like a valve may be hung open.
 

Last edited by Taboo80; Jan 19, 2013 at 06:35 PM.
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Old Jan 19, 2013 | 06:27 PM
  #107  
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The longest push rod is installed the front exhaust position,

Is that the first hole in the front head?
 
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Old Jan 19, 2013 | 06:29 PM
  #108  
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Originally Posted by Taboo80
Whats the compression readings, sound like a valve may be hung open.
75-80psi both cylinders
 
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Old Jan 19, 2013 | 06:30 PM
  #109  
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Originally Posted by bluharley
No, they'll bleed down after sitting a few minutes. How many turns do you turn them out from bottom?
Per instructions, 9 flats or 1-1/2 turns
 
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Old Jan 19, 2013 | 06:32 PM
  #110  
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1 1/2 turns? That don't sound right. Se are 2 1/2, and they have really coarse threads. You have Velva Touch, right? Well, that's what they say on the web site. Still don't sound right, that means you have about 15 threads per inch, that's really coarse thread.
 

Last edited by bluharley; Jan 19, 2013 at 06:38 PM.
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