Early on they had issues with the carbs, el 46 carbs had a bough off idle, some would bough and die
El48 and newer ones were the fix. There are at least 4 different carbs. El44, el46, el48 ect...
Danny Cox is the guy that worked on my bar and Jack repair stuff, just west of Roseburg.
I think he is pretty much retired. He is a real pro and great guy.
He was Timberland Enterprises
Try a rubber plug, been doing it that way for years as needed..
I use an old kick fin that I found down at the river. A couple wacks with a hammer to install. Needs to be bar thickness, they stay in place.
The nozzles are pressed in so you can change them. Use a drift just under nozzle dia. Make sure to clock them like the old ones were set up. Make sure and vac and pressure test after installation. Be sure to clear any codes.
I believe what causes them to fail are fines.
Pay close attention to...
I know that the cranks are different, 371 have a smaller hole on the big end bearing pin. They have a different part number.
There were lots of cracked dogs and cases on 371s do to a bad vibration harmonic.
Cranks can be swapped though...
Dall chains high rakers and cutting air will smoke big end bearings fast. Tree service company saws have it rough but not as bad as Wildlands fire crew saws.
I have never seen a lower rod bearing fail on 562s. Maybe a bad batch of bearings is to blame.
Here's my 10 cents worth...
The blue stones are great but they are real hard on dressers. It's white wheels for me. Single points work fine on the side plates. Save the multi points for the top plates.
Put a new wiring harness in it if it's not fuel related. I did that on my Ms 362 problem solved. You no the small wiring that connects the coil to solenoid and switch. Rich the chainsaw guy told me about it.
Ya holes across the back works well on 562s. On the OE 550s I cut a chunk out of back of top cover just enough so the mark 2 filter fits. Not good for working in very wet conditions.
Here's what I have done with these tank vent lines.
Cut the line half inch long on the vent side, stuff a piece of scotch brite pad loosely in end done. Plug the other end with thick weed eater line close to where it goes into air filter base.
I have them on a couple of 550s and 562s and they seem to be working great. If a guy cuts much in a burn you still will need a foam pre filter...
When I work in bad bark dust or burned timber I open up the back of my air filter covers, seems to help with dust injection or packing on the filter...
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