372xp

[Cut4fun]

2 Stihl 084  didnt pop either , one stock psi, one with monster psi.  Yes I pulled very smartly.

066 dont have a de-comp and no longer have a 361 to test.


But I do have extra 361 and 066 de-comps I could put in my high compression Huskys to test that theory too.   

[JohnG28]

Cut4fun, the saw I speak of is a 361, just getting nice and broke in, high compression...doesnt pop till running

[Rocky_J]

I would say that Joe Indi has a couple bad compression release buttons. The supposed technique he suggested to test compression does not work, or at least it should not work. Maybe he's using inferior mix oil and the compression release valves are plugged up with carbon?

[Cut4fun]

Cut4fun, the saw I speak of is a 361, just getting nice and broke in, high compression...doesnt pop till running

I'm just testing Joe's theory's is all.  I dont think that way he suggested works.

[JohnG28]

Is there any chance that the placement of Husky decomp valves could have anything to do with it, as the ones I can think of come out the side of the cylinder, as opposed to Stihls placed on the top?  Just thinking of possible scenarios that could be a variable here with the different results we seem to be getting.  I doubt that this would be the case, but just a thought.

[Cut4fun]

Is there any chance that the placement of Husky decomp valves could have anything to do with it, as the ones I can think of come out the side of the cylinder, as opposed to Stihls placed on the top?  Just thinking of possible scenarios that could be a variable here with the different results we seem to be getting.  I doubt that this would be the case, but just a thought.

I have none to test on for that, 361 044 046 066 (Somebody try it for us). Even the stihl 084 even though on the top is really off the side of cylinder too.

[JohnG28]

Well like I said, on the 361 it works normal, just when running.  I know the valve is ofset to the right side of the cylinder, but still appears to be on top. I was thinking of how the Huskys have the valve down lower and coming horizontally out the side.

[Cut4fun]

Well like I said, on the 361 it works normal, just when running.  I know the valve is ofset to the right side of the cylinder, but still appears to be on top. I was thinking of how the Huskys have the valve down lower and coming horizontally out the side.

Are you saying with the 361 SWITCH IN OFF POSITION you can pull it over SMARTLY and the DE-COMP WILL POP OFF?

[Mark K]

I tried today to get my decomp. to pop off with the ignition off. I can't get it to pop off unless I turn the switch on. This was on my newer 372 that I use just about every day. My ported 046 won't pop off either until it trys to start. I imagine that them decomp. buttons can get worn over time.

[Cut4fun]

I tried today to get my decomp. to pop off with the ignition off. I can't get it to pop off unless I turn the switch on. This was on my newer 372 that I use just about every day. My ported 046 won't pop off either until it trys to start. I imagine that them decomp. buttons can get worn over time.

Thats good enough for me. Enough silly testing  of de-comps and compression with off button  

Thats what a gauge is for anyways and $25 is all too. 

[HolmenTree]

Geez I had to go and try my 372 too. I think Rocky is right I need a new decomp valve. Its pretty loose. I watched it while the saw was running up to WOT and it didn't go back in to open on its own.
Willard.

[JohnG28]

Cut4fun, what I meant was that on the 361 the valve will only close when the saw starts running.  It will not close with the kill switch in off position.

[Cut4fun]

Got it now. 

[joe_indi]

Gosh!
I never thought that I would have nearly the whole forum pulling away at their saw starters trying to get the decomp valve to pop up.

My last reply here was at 12 midnight it was only today that I could tried to verify why the de-comps are not popping.
What I figured out is the following.

1. This test seemed to work only on Stihls, because the Stihls have the Decomp on the cylinder dome.Huskys and many others have the valve as JohnG28 pointed out, lower down on the cylinder. Stihl valves pop while the piston has just about reached TDC while as Husky A.O. pop while the piston is hurtling down on the power stroke.
So this test will not work on saws with decomp valves located on the cylinder wall.
So my original reply to Knute  regarding the 'decomp valve test' was wrong, my apologies to Knute and any Husky owner who have been pulling at the starters trying to get those valves to pop. This test does not work on Huskies.Sorry once again.

2. I usually do this test on saws that really need a compression test.   .Not a new saw or a perfectly working saw,
A saw which needs a compression test dose not have a spanking new decomp valve, Just an average working unit.
So, with the spark plug removed and a squirt of oil inside and the plug back in place, a couple of slow pulls to get that oil around and, finally, that smart pull.
If the decomp pops, the saw should have compression to run some more.
If the decomp does not pop, I attempt to start it up at that point, it should start but will usually die once all that oil smoke has cleared because just that oil was aiding the saw attain that extra compression.

Thats what a gauge is for anyways and $25 is all too. 

I have no gauge to test the compression on a two stroke and they are not available whatever the price.So I  have to make do with something like this as an alternative.