Good point! I was pulling my hair out over what ended up being a faulty compression tester a few years ago.

Old comment I realize, but a 550 is a smaller saw than what’s shown here.

A lot of service manuals for chainsaws say that you MUST do a vacuum before a pressure. Now if it is 100% necessary I don’t know. I always do a vacuum before a pressure but as long as you’re at least performing both you’ll be good.

Did you figure out what the problem was with your Husqvarna 61? I've got one also. It's hard to start sometimes. Either when it's cold or when I'm cutting firewood and shut it off for a few mins, and then try to restart it. I've ordered a carb rebuild kit, and of course I put a new spark plug and fuel filter on it. I'm hoping the carb kit fixes it. It's a nice old saw that I picked up for $50 at a yard sale. Runs and cuts like a beast, when its running....

Stuck ring would do it, but prob not the case here. I’d guess the decomp valve is bad. Easy enough to plug the hole and test again.

@@brucea550 Got it apart and it had a blistered looking place on the piston land. It was deformed and had obviously been very hot right there. I guess it effected the ring too. I've bought a new meteor piston and caber ring,but I lost one of the little spacers that goes on the cylinder bolts and I'm having trouble locating any.

@@ciphercode2298 That almost sounds like a factory defect, if the piston got that hot but no cylinder damage. Not sure what spacer you need, but here’s the exact place to find it- www.jackssmallengines.com/jacks-parts-lookup/manufacturer/husqvarna/chain-saws/550-xp-2013-01?__cf_chl_jschl_tk__=9664fac9225966f44b42b88cfe6832e9d1bc584a-1626133662-0-AVMIMSz67fySoLrHgIWPRCq3P-gGuTM2ZN1YFtWF_zEbSRhlbqtvI2U2gMQzjlW2KJXZWVWaqoihdUb3yVRlnFRP98bv3nvk7lKeJFb9yUf_CQkLT9BgFpiVWnpVBFYO47U2DHcEe1ZWkA72RGusE40WH18IcJppbkTSn-MTijaDrSJ9iq6yIolfWdmbpjZwR2QOG2dyWgAWdo8-W_udnw0HtWae9uqqQxgUFlWl2gMKDRW5Rwod8oBTpnyd2hFBy3jphp4RkLSJSGeUsHXhZKjOPRd_YA3enGGdoyzVeCohi0LDKSGbFrbbZo9sCbUPd4NDpkqFAq9tSELt5wnM4RNXjhnzJOGtj5GK90bMP6JeHaBnqky3QVXH8YL6X-XtDcSjEtq1qXwtpOpU5FIOUwHK2_Aqty8wpMjFW6x-s7Hpvyp6pxsrazvuxsjnROkkG7uBSQVVvNB12mt4Q8oyF3bXR_VHSX8IaSlNT9VoHjeL54a3Sed7PTswWOc8gelOaHamF2jR35UR7vJobtdn41MGbKSiKM9uHMqTAL1uHuOE

@@brucea550 I appreciate that,I'll look it up. Theres little spacers that go between the cylinder bolts and and the cylinder. They set at the cylinders base and are shaped like a thread spool. They're only about 1/2" long. I've never seen any like them,which is how I lost the one when I took it apart. I'm usually stihl guy anyway,but got this saw cheap because of it's running condition. It has a date etched into the top fin of the cylinder beside the spark plug that reads 10 2017,but as I was taking the saw apart the date of manufacturing on the coil said 2013. It probably belonged to a tree service company and saw lots of use and I figure it was rebuilt in October of 2017. The cylinder has husqvarna markings on it,but idk about the piston and ring. I do appreciate your help.

@@ciphercode2298 Jack’s isn’t cheap, but they have always been my go to source when I need a hard to find part. Great quality and service, and fast shipping, so I’m fine with their higher prices. Good luck with it. It’s possible the saw is a 2017 and the coil was simply existing stock. They don’t go bad sitting on a shelf. It’s also possible you’re correct about it being rebuilt once already. I’ve heard the 550xp is a nice little saw. I’m partial to Husky, but have a nice running 041av mounted to a Lewis winch, an 031av I’m currently rebuilding, and big old 066 I use occasionally for slabbing large logs. My Husqvarna saws are all about 30+ years old too, not a fan of computerized epa stuff I can’t adjust myself.

Fixed it... and you look great. No need to watch on 1.5x

HLSupply thanks!

Ha Ha