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Author Topic: Compression  (Read 9449 times)

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Offline nixon

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Re: Compression
« Reply #20 on: July 05, 2013, 06:16:15 PM »
nixon,good luck to ya. sorry to hear of your troubles. keep on sawing!!!!!!
Thank you very much! I've got about 5 more sessions to go (6 days plugged in ) 21 days off . But things are responding nicely .
As soon as i'm free and clear , I'm getting a 395 xp that I've been after and having it ported . Seems like there will have to be some jewelry for my wife involved, but she's been a real trooper through all this.
Stihl            044 ,ms 460
Husqvarna.   346xp ,550xp, 562xp
                   372xp ,390xp, 395xp

Offline JohnG28

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Re: Compression
« Reply #21 on: July 06, 2013, 01:37:26 AM »
nixon,good luck to ya. sorry to hear of your troubles. keep on sawing!!!!!!
Thank you very much! I've got about 5 more sessions to go (6 days plugged in ) 21 days off . But things are responding nicely .
As soon as i'm free and clear , I'm getting a 395 xp that I've been after and having it ported . Seems like there will have to be some jewelry for my wife involved, but she's been a real trooper through all this.
Good to hear that things are going well for you, hope it continues that way. As for jewelry for the wife, or something of the sort, I too know the barter process for new toys. :D At least everyone is happy in the end. ;D
Stihl MS361, 460 & 200T, Jonsered 490, Jonsereds 90, Husky 350 & 142, Homelite XL and Super XL

Offline deerslayer

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Re: Compression
« Reply #22 on: July 06, 2013, 09:25:00 AM »
One note regarding compression. While low compression is usually an indicator that something is wrong, high (normal) compression does not necessarily indicate all is well. I have seen a number of badly scored pistons produce compression readings in the normal range. It is a useful tool but to ensure good engine integrity it should be coupled with an actual view of the piston and cylinder. A few minutes removing the muffler will generally provide this view. If the spark plug is out as well then shining a light in  one hole allows easy viewing in the other.

I agree with the poster saying a compression reading may take a lot of pulls. I usually pull the engine through 8-10 times or until the gauge stops rising. Also, I haven't found that it makes a difference whether the throttle is open or closed. You'll wind up at the same reading either way.

One thing to also check is to ensure the compression release (if equipped) is closed and not leaking. Many heart palpitations have been caused by people thinking their engine was sick and that's all it was.
Too many chainsaws, not enough wood.
Stihl, Husky, Craftsman, Mac, Homelite, Poulan. Some live here, some just passing through.

Offline nixon

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Re: Compression
« Reply #23 on: July 08, 2013, 07:43:51 PM »
Mr. Newman .
I've been sprung from the hospital ,but I'm pretty rough around the edges right now . ( not to mention pretty medicated  :). )
If You'd like, give me a call this weekend ,and you can drop by and pick up the gauge .   
All the best , John
 637-0085
Stihl            044 ,ms 460
Husqvarna.   346xp ,550xp, 562xp
                   372xp ,390xp, 395xp


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