Seized chainsaw

   / Seized chainsaw #61  
A pic of the exhaust port of a MS250 I rebuilt a few years ago. A badly scored piston and a stuck top ring. The saw was still running and not badly at full throttle but wouldn’t idle. About a $100 for a new jug and piston. At the time I was 100% sure I never ran straight gas in it but that is probably what happened.

3B70D5BB-F8B0-4805-A16B-AA2D77A5E62E.jpeg
 
   / Seized chainsaw #62  
Too much oil in the gas and you can get a contract with the county fogging for mosquitos.

LOL, way back when cutting for a cottage roadway in early buggy spring Deet and extra oil in the chain saws was the order of the day.

The work gang were all cottage owners and it was very comical to see the various getups to ward off skitters and black flies. From long pants with elastics at the cuffs to full bee keepers hoods.
Even saw a few that duck taped their pants and cuffs.

My defense was rubbing orange peel skins on my neck and arms as well as a heavy extra dose of oil in my saw mix.
 
   / Seized chainsaw
  • Thread Starter
#64  
Did you pull the muffler and look in at the cylinder and piston with a flashlight yet?
Already removed cylinder assembly. Piston got 1/4 in long deep scratch. Cylinder not as bad with some small scratches. Ordered new ones
 
   / Seized chainsaw #66  
I use a sawzall on roots where needed.
Using a chainsaw seems like a futile way to remove a stump.
The stump was about 24 inches in diameter, and a bit deeper than my 18" bar. Using a sawzall seems kind of futile in that situation, unless I wanted to dig the stump out first. I believe that it took me about an hour to take it out.
 
   / Seized chainsaw #67  
Already removed cylinder assembly. Piston got 1/4 in long deep scratch. Cylinder not as bad with some small scratches. Ordered new ones
was scratch on vertical orientation?
would lean towards mixture issue
 
   / Seized chainsaw #68  
I wouldn't think so. A dull chain will just cut like crap.

My buddy siezed his Husky by grabbing the wrong red gas can. Another friend's wife did the same to the leaf blower. Maybe you forgot to add the 2 stroke oil to the gas, or not enough. FWIW I always put the 2s oil in the 1 gal jug and then put in 1 gal at the pump, always 93 octane. And I started using Star Tron in small engines. And the only jugs for gas/oil mix are 1 gallon and all other red jugs are 5 gallon.

Here's an idea for all us 2 stroke users; maybe spray paint the red jug w/ mix in it half flat black. No more mix-ups.
I use a big fat black permanent marker to put the mix ratio on the jug. I leave it blank for straight gasoline.
 
   / Seized chainsaw #69  
As someone that has worked at a Husqvarna dealer and has had experience with sleds back in the 70's.
1. Huskies and other saws would often show up for "won't start". Would perform the drop test-- drop the saw holding onto the starter grip -- if it fell quickly would pull the muffler to inspect for scoring. Often found the piston scored, some were dry from no oil--as in straight gas, some oily as in wrong carb setting. If the saw dropped slowly with a plup-- plup--plup then often figured compression was not an issue. But a compression gauge, as Paul Harvey did told the rest of the story. 100 psi very minimum suggested is 130 or higher. If any piston cylinder damage was suspected pulling the muffler revealed the good or bad.
Often when a 2 stroke has poor sealing of the rings the compression blows by the piston and dilutes the fresh mixture so incorrect fuel mixture = no start. But often a customer stated," I changed the gas, the spark plug, and the air filter but it still won't start".
Also be aware of old stale fuel mix. Recommend not using fuel over 30 days after purchase as do most manufacturers. And shaking the fuel can before filling the fuel tank

2.Experience on JLO engines used on sleds. Large singles and the larger twins often had the most burned pistons. Often presented with "won't start" Always after pulling the head found a burned piston. The twins especially the 440 always burned the right piston, the one fartherest from the fan. They used a Walbro pumper carb. noted the carb set at an angle, and there was even a dam in the manifold to direct more fuel to the right cylinder. Needless to say I got good at replacing pistons. Later with new model sleds the engine was refined and produced as the Cuyuna engine, two more head studs, but more important was the carb manifold change. The carb now was mounted flat and changed to a float style Mikuni. No more issues, and a better running engine.

3. In the early 70's the recommend oil was a 30 weight two stroke oil mixed at 20 to 1. sometime around 73 or 74 a synthetic oil was recommended to replace the old oil and was mixed at 40 to 1. There was some oil that came out that was recommended 50 to 1. I have noticed a lot of newer equipment needs the highest JASO rated oil. Be sure to check with your dealer or operators manual for the correct spec. Old outboard oil just doesn't work in new equipment.

If nothing else I hope this gives some food for thought
Have a wonderful day
 
   / Seized chainsaw #70  
My Husqvarna 570 seized during firewood cutting. No compression. I put atf in the cylinder and waited 48n hrs. Now there's 100 psi compression, good spark bot won't start. Looks like some atf still in the cylinder. Its coming out thru sparkplug hole and muffler when starter is pulled. Not much... I think that's a reason for not starting. Is there way to get it out completely? Anything else to look for?
were you using ethanol gas? Lost 3 saws to that crap. Never put it in anything but my cars now.
 

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