compression

I am planning to buy a second hand chainsaw and like everyone knows: if you’re not careful you’ll buy someone else’s problems. Thus to avoid that I bought a compression tester but I’ve heard so much different stuff like: run the chainsaw, others say to not do that then some say do it with full...

So I've got a 49SP that has never given me any problems before like this...It is almost impossible to pull the starter; I've poked around on the net for ideas and here's where I'm at: Engine rolls over great without the spark plug, Exhaust is fine, muffler OK, cylinder looks nice through...

Hello, everyone. Have been lurking on these forums for a while. About a year ago, in March 2023, I purchased MS 261 saw with a carb from my local Stihl dealer. Manufactured in August 2022. I have had to adjust the carb with a tachometer as initially had some issues restarting the saw when hot...

HI everyone I have been working on a 1957 IEL Ra chainsaw. i just ran a compression test and got about 32 psi after 3-4 pulls. before i start buying parts i wanted to know what my compression should be for a chainsaw like this. also looking for a piston and rings for this saw and wondering if a...

Hello to all. New to chainsaws I have a Stihl 066 that I freshly serviced at a dealer. Everything checked out. Brought it back home and starting cutting some logs. started well, went full throttle, no loss of power while cutting. However, it loses power (shuts down) while idling. Things I...

Compression is 80 one will start the other will not. Rebuild carb and has spark

Recently resurrected my Sachs-Dolmar 120 Super with help from this forum and wondering what these had for compression when new and what would be the threshold for a top end refresh/replacement. I got 134 psi when I measured with some light oil in the cylinder (since it had been sitting for a few...

Work trade for a generator gone bad. $1500 in hard labor got me a no run generator. Only had half an hour on it but had sat outside a while apparently took quite a bit of water through the muffler. I put some diesel down the cylinders but didnt realize they were chalked full of water. Wiggled...

I have a nice little 032av that bulked up in compression it seems within a week. Pulls free without plug and the rope pulley is in great working order. Put a little wd 40 in the port but still wants to take my arm off. Do I start with looking at the cylinder? What else could cause this? I...

Hi to everyone on the forum This is my second post and as per the title I am concerned about the compression level my husqvarna 61 has. First off I rebuilt this saw totally from the bottom up. It has a gilardoni 48mm open port piston and cylinder with a new OEM ring. Essentially when rebuilding...

Hi all, I was hoping someone could help me identify the issue I am having and how to go about fixing it. Based on reading post here and elsewhere, I suspect I am experiencing "hydrolock" or hydraulic locking in the crankcase ? The saw was recently (three weeks ago) running well and starting...

I tried out my new gauge yesterday and it showed 30psi on a 661 with a scored c&p which sounded about right. Today I tried it on two 200ts with new pistons we got from lone wolf and it was only reading 120psi versus the 160psi on his US Gauge brand. Anyone else had an inaccurate otc gauge? I'm...

Have not yet torn down my 031AV that had the loose muffler. But have been mulling what I know so far 1. Muffler flange was broken and muffler loose. That affected running for sure. 2. With top cover off I was able to ever so slightly move flywheel up and down and feel a click. Not sure if this...

Picked up an 026 that wouldn't run unless you primed it. Checked the usual: fuel lines, carb., choke. Finally checked compression and it was 90 psi. Tore the saw down and ring gap was huge and piston skirt worn. I bought a meteor piston with caber rings. Polished the cylinder with scotch brite...

I'm looking at a used 550xp. The seller isn't completely sure of the history. But, by the looks of it, it's in good shape. Gray paint on the clutch guard isn't scuffed to pieces yet - good sign. Seller tested the compression at 145 cold. He's at 180 ft, for what it's worth. Here's the question...