Author Topic: 372xp (Read 1886 times)

Knute · « **on:** March 09, 2010, 08:00:44 pm »

Can you tell me what to expect the compression to be on a new or nearly new 372xp

Rocky_J · « **Reply #1 on:** March 09, 2010, 08:19:45 pm »

In 30 years I've never put a compression tester on a chainsaw, but I'll take a guess and say at least 150 once the rings are seated. That usually takes 4-5 tanks of fuel (working, not idling).

Knute · « **Reply #2 on:** March 09, 2010, 08:32:33 pm »

Thanks. I see used saws advertised and often they will list the compression. Without knowing what the compression is on a newer saw, I don't know if it is good or not.

flushcut · « **Reply #3 on:** March 20, 2010, 07:32:19 am »

It is around 150psi and from what I've hear. They tell you that is has compression so that way you know that it is not burned up.

joe_indi · « **Reply #4 on:** March 20, 2010, 07:47:36 am »

With the switch off and the decompression valve pushed in, pull on the starter smartly.
If the decompression valve pops up, you have decent compression.
Simple eh?

Cut4fun · « **Reply #5 on:** March 20, 2010, 08:43:53 am »

I wouldnt really go by de-comp pushed in and it pops open when pulled through as good to go. 365 with 115psi pops the de-comp just fine and it was worn out. This was with switch on and it burped.

HolmenTree · « **Reply #6 on:** March 20, 2010, 09:51:43 am »

On the 576XP AT s I have the button pops out when running.
Willard

Rocky_J · « **Reply #7 on:** March 20, 2010, 10:09:24 am »

Quote from: HolmenTree on March 20, 2010, 09:51:43 am

On the 576XP AT s I have the button pops out when running.
Willard

Isn't that what it's supposed to do?

$:-\$

JohnG28 · « **Reply #8 on:** March 20, 2010, 10:19:28 am »

I thought the same, aren't they supposed to pop back once it starts?

HolmenTree · « **Reply #9 on:** March 20, 2010, 08:01:19 pm »

Quote from: Rocky_J on March 20, 2010, 10:09:24 am

Quote from: HolmenTree on March 20, 2010, 09:51:43 am
On the 576XP AT s I have the button pops out when running.
Willard
Isn't that what it's supposed to do?

$:-\$

Easy boys, I was just relating to Joe's earlier post. Joe said with the ignition switch off crank engine over quickly and valve should pop up.
My 090 AV decomp pops up automatically, its spring loaded

Willard.

HolmenTree · « **Reply #10 on:** March 20, 2010, 08:08:48 pm »

Quote from: joe_indi on March 20, 2010, 07:47:36 am

With the switch off and the decompression valve pushed in, pull on the starter smartly.
If the decompression valve pops up, you have decent compression.
Simple eh?

Thats very true Joe, my 372XP has a "loose" decomp valve too. It pops out on its own too without the engine running.
My 576s have a rubber grommet sealing the valve button in the top covers hole, so I guess thats why its a little stiffer to pop out.
There now I can rest my case

Willard.

JohnG28 · « **Reply #11 on:** March 21, 2010, 09:06:16 am »

I dont run a larger Husky with a decomp, just my Stihl has it, and I hadnt noticed it popping when cranking, only once it burps or turns over, thats what I meant. I wasnt trying to say that you guys werent right, just hadnt seen this before.

Cut4fun · « **Reply #12 on:** March 21, 2010, 11:53:21 am »

Quote from: JohnG28 on March 21, 2010, 09:06:16 am

I hadnt noticed it popping when cranking, only once it burps or turns over, thats what I meant.

You got me thinking, I dont think any of mine pop the de-comp with switch off. I will have to go check and get back. I got them from 130-150-160-170-180 and up.

Rocky_J · « **Reply #13 on:** March 21, 2010, 12:05:39 pm »

If you have a saw that will pop the decomp button with the switch turned off, then you need a new decomp.

HolmenTree · « **Reply #14 on:** March 21, 2010, 12:08:48 pm »

Quote from: Rocky_J on March 21, 2010, 12:05:39 pm

If you have a saw that will pop the decomp button with the switch turned off, then you need a new decomp.

No as Joe says "switch off and crank smartly"

Willard.

JohnG28 · « **Reply #15 on:** March 21, 2010, 12:22:33 pm »

Im not trying to argue or say your not correct, but on the Stihl Ive cranked it accidentally without turning on the the switch to run position, and the decomp stayed down until I switched to run and it turned over.

Cut4fun · « **Reply #16 on:** March 21, 2010, 12:34:07 pm »

Quote from: joe_indi on March 20, 2010, 07:47:36 am

With the switch off and the decompression valve pushed in, pull on the starter smartly.
If the decompression valve pops up, you have decent compression.
Simple eh?

I just tested this theory. Switch off and on 2 saws that have 180psi and another with 190+psi. de-comps did not pop off no matter how smartly I pulled them over.

joe_indi · « **Reply #17 on:** March 21, 2010, 01:58:05 pm »

The keyword here is smartly.
What I mean is more force that the usual starting force.
Ground start position is not good.
Between the thighs is better.
Okay there is another thing .
This test was what I do for Stihls.
The Husky de-compression valve has more air through flow than that on a Stihl.
Could this be the reason why its not working?

Cut4fun · « **Reply #18 on:** March 21, 2010, 02:11:02 pm »

I was doing Huskys. I will go try on my Stihls now too. Yes I was pulling VERY SMARTLY

, alot harder as if I was checking compression.

JohnG28 · « **Reply #19 on:** March 21, 2010, 02:12:55 pm »

That could be why we're not getting same results. I almost always use the thigh position, and I pull pretty hard, but I dont yank on it in an attempt to pull the cord right out, dont need any avoidable repairs.

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Author Topic: 372xp (Read 1886 times)