Will a compression test identify a leaking comp release ? Just starting to dig low power, won't reach full rpm issue. Starts fine,idles fine.
036 compression release diagnosis
- Thread starter KMSwr
- Start date
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Compression test would be a good idea to gauge the health of the saw. Also pull the muffler and inspect the piston. If it’s scored your looking at a new piston and ring possibly a cylinder. Pull the muffler first. If the piston looks good then go further with it. Doesn’t sound like an air leak, mite just need a carb adjustment.
Decomps are notorious for leaks, that's why people plug them if possible.
Compression may be low but for reasons other than the decomp. Do a vac/pressure test. If there is a leak and you just plug the decomp, you could be in for trouble.
True, I should have mentioned that. Plugged the decomp on my 036 Pro and several other saws. They’re not really needed until you get into the 90cc plus range IMO.
I agree, they are also helpful on some high compression smaller saws with weak starter pawls.
spuldup
ArboristSite Operative
Just plug the decomp and see how that does.
If it's not the decomp check the spark screen in the muffler for being clogged, and under the carb diaphragm cover for sawdust (carb can't pump). While you are in the carb also check the screen filter and one on the hose pickup.
Any of the above will keep a saw from revving WOT.
Any of the above will keep a saw from revving WOT.
One more thought on plugging the decomp valve - make sure the plug extends the same length as the valve, otherwise, you will increase cylinder volume and decrease compression.
Spray soapy water on the decomp vale and pull it over with switch off. Look for bubbles. Then try the same starting the saw. This will show a leaking valve.
But unless you find a large leak this is not the issue.
But unless you find a large leak this is not the issue.
A leaking decomp button would really have to be F'ed up to cause issues you'd notice. The stihls have a notoriously small port drilled in them( I change mine over to husqvarna).
You have other bad stuff going on is my guess. You would see mix blowing out the decomp if it has reliability issues.
You have other bad stuff going on is my guess. You would see mix blowing out the decomp if it has reliability issues.
Which husqvarna decomp would you use on a 036 stihl?
372xp, but my 034S has a pop up piston and a base gasket delete. Its got a little more compression than normal.
still having a problem finding a plug 1122 025 2200, ordered from dealer but its been 3 weeks ?
I
If you want a factory stihl I've got a couple sitting around, pm me your address and I'll mail you one.
Every cylinder head is cast with a boss to accommodate a valve
. The pro models will be drilled/tapped, and receive a de-comp valve, or the delete thereof, a simple plug.
These valves are generic.
If I do take the carb apart I might as well get a kit RB 31 ? What is the best aftermarket kit ? Stihl kits are $42 ?
Try to get a OEM kit from carb maker. Tilloston may have good kits. Not sure?
If you are careful carb can be taken apart without tearing things. Put a little vasiline on gaskets/diaphragms and they will come off next time, without tearing.
$thil/$teal is very proud of what they $ell/rape you for.
I'm glad I have a stash before even, Ebay $tihl parts went crazy. I have a box of RS33 72 chains I got for $15 each, delivered. Some $40 pistons.
before buying parts, did you diagnose the problem properly?
- was the spark arrester screen plugged?
- Is the fuel vent or fuel lines OK? try starting the saw, putting it on its side and carefully removing the fuel cap, does that help it rev?
(both of these issues can cause a saw to struggle to get to high revs).
I'd try cleaning out a carb before replacing it.
- was the spark arrester screen plugged?
- Is the fuel vent or fuel lines OK? try starting the saw, putting it on its side and carefully removing the fuel cap, does that help it rev?
(both of these issues can cause a saw to struggle to get to high revs).
I'd try cleaning out a carb before replacing it.
Its a zama carb,zama says to go to oem
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