air leak

Ok so my neighbor straight-gassed his MS 311. He had a friend (not a professional) put in a new piston & cylinder. I don't know the specifics of exactly what that guy did - whether or not he replaced crank seals, etc. But he couldn't get it to idle after afterwards, even with the LA screw all...

I recently purchased a "lightly" used Echo CS-590 from an older couple (still had the security tag stuck to the bottom). I took it home and put fresh 50:1 in the tank and fired it up. It popped right away but would only stay running past half throttle. Anything less than half and it would stall...

I have never had an issue pressure or vac testing a saw with a decompression valve until now. I have never plugged a decompression valve hole to pressure test a chainsaw…. Well currently I’m working on a 3120 xp. I have been through two Oem decompression valves. Neither would hold pressure. I...

Hi everyone, looking for some advice. My brand new cs will only start under full throttle, can't even get nice sputtering with choke on. It will also run at full speed when the gas tank gets fully depleted. I tuned it up what I thought was nice but this didn't solve my issues. From looking it...

Converted an 024 super on an 026. Got everything together. Zero leaks from the case or cylinder. Sparked it up, turned it to the side and it dipped in idle. Grabed the brake clean and found a leak behind the carb. Confirmed it was not the fuel line or impulse line. I cannot, for the life of me...

Hi, all I have an old Stihl 021 after my grandfather that I'm trying to revive. It didn't start when I got it. I tore it down and gave it a new fuel line (old one was torn), fuel filter, spark plug, air filter and breather tube. After this, I got it running, but not well. It idles just fine...

Hi folks, I have a 5 year old Jonsered CS2240 S (Same as husky 435 I’m told). Saw was running perfectly until about one week ago, when it started to race with no throttle applied. I was able to adjust the idle screw to almost get rid of the turning Chain but not quite. Ive also set the high and...

I bought a 565 today and while looking it over i noticed quiet a large crack in the intake boot. Hope you can see the crack in the photos, how many of you have seen this on brand new saws?

I'm tuning a 2004 Husqvarna 55 Rancher. Just rebuilt the carb and am adjusting the mixture. When adjusting the H screw I found I could not get the RPMs to drop down below 13,000 (spec. is 12,500). At one point I had the H screw backed out 4 complete turns but the RPMs were still over 13,000. The...

Howdy All, So I have been working on many saws for years, but not everyday. I climb and my 201t (around an 08, timing advanced five degrees, exhaust drilled out, best saw I have ever had for 5 years now) started runin the chain fast on idle and it wont adjust out. Also when the tank is full it...

I'm hoping for some second opinions on a saw diagnosis that I've done. I got a Stihl 031AV that has recently had the carb rebuilt and was running successfully but now the saw races at idle even with the idle screw backed all the way out. I am suspecting an air leak but I have no tools to test...

Alright here goes, As the title says I performed my 2nd 064 to 066 big bore conversion, not sure if that's relevant to this issue though.. After the swap I pressure/vac tested, found a leaking Flywheel side crank seal, replaced that. Then found a leak at the clutch side bearing seat in the...

Sometimes when you think you got a bargain, reality slaps on your face, from some odd reason that happens to me every time I buy something used. I found an ad online where small engine repair shop did sell Jonsered cs-2145 for 167$ which around here is not a bad price at all, saw in pic looked...

Patient is a 460, melted piston/cylinder. before disassembling top end, did a pressure test. the oil seal is leaking like an SOB, I'll replace. Also noticed that air is leaking out of this screw hole (oil pump mount screw hole, clutch side). Is this normal, the screw just plugs this leak...

Hi all, I'm chasing what I'm sure is an air leak somewhere in my MS361 (erratic behavior I cannot eliminate via carb adjustments), and I don't have easy access to a compression and/or vac tester, so before I retrieve said tools and tear it down to check the oil seals, piston, rings, etc., I was...