I put a new chain on one day and some how during this process sawdust got in the muffler and blew the bottom end!.
Congrats. Add lieing POS to your resume.The story has not changed. I always said it failed due to sawdust getting into it. That clearly wore it out.
Lean refers to air to fuel ratio smart guy.Definitely not a lean seize. I have always used a 50:1 ratio for that saw.
Air leak would be my guess, but I have a feeling you could screw you about anything.OK, troll. How do you explain an immediate lo9ss of compression and performance?
Wood doesn’t destroy pistons—you’re right it simply burns. Dirt, grit, rock dust metals dust… yeah those will destroy pistons.Anecdotal evidence, but I think still worth the mention...
At my Echo Dealership, the Service Manager showed me a top end that had, what to me, seemed like an odd colour. I asked about it, and he said.. " It's from wood dust getting past the filter.: There was an odd "burnished" look.. a kind of light brown / tan colouration that I'd not seen before, I asked if that was why the saw was in pieces on the bench, and he said no.. The wood ingested, is burned up during normal combustion, and just resulted in some discolouration. Sawdust isn't capable of scratching metal in small quantities. Remember, the fines would be sucked into the combustion area, and burnt immediately to ash. Fines or ash, even if a very, very small percentage of them got stuck between the piston and the sleeve, would have minimal effect or consequences to the saw. They simply deposit, what is probably basically creosote on the piston dome, and on the top of the combustion chamber. That was the discolouration that let them know that the filter was letting stuff get through. That, and the presence of fines where they shouldn't have been in the induction area of the saw.
Are fines good for a saw? Uhhhh... no!! Do they cause catastrophic failure? I sincerely doubt it.
LOL I love it!I once had. A stick poke a hole in the air boot on a cr250 Unbeknownst to me. It ran all weekend without losing power or seizing and this was in sand country. Granted the piston was polished smooth and the bearings where not looking good, but it never died.
LOL somebody lied for sure. I suspect it was dealer and OP is just (rightfully) pissed about this. And it’s never fun to realize you’ve been lied to and taken… but… nobody died… and he’s got a 500 now… so… the moral of the story is don’t trust dealers and don’t let dirt or metal into your intakeCongrats. Add lieing POS to your resume.
The dealer thought so, too. The only good thing is that, after they told me repair would be $1100 for a new block, piston and crank, they offered me an MS500i for $1180, which I accepted. What an upgrade! It not only cuts faster, it cuts more per unit of fuel used.
Really?Scoring from leanout failure takes a long long time
Idk Bwallker from Adam but he used to ride a Honda CR250 two stroke… one of the best motorcycles ever made in the history of time… so… I automatically like himIt would seem that Bwalker is in a bit of a mood today..
Gonna grab a cold one and some popcorn, sit back and watch the magic..
Really?
I would have thought that an air leak causing a "leanout failure" would scuff and score if not seize a saw dam fast at high load and high rpm (in minutes if not seconds)...is this not the case?
depending on where the leak is, if the leak gets large enough the motor simply will not be able to idle. Bigger leaks it will fire on startup attempt but not be able to run.Depends on the severity of the air leak.
Detonation could be caused by running lean, but not usually in a saw in my experience. Running lean does certainly heat a saw up quick though.depending on where the leak is, if the leak gets large enough the motor simply will not be able to idle. Bigger leaks it will fire on startup attempt but not be able to run.
But you’re right if it’s leaking enough to still run but be severely lean it’s gonna for sure result in piston damage. I think the engineers call it detonation damage or something. That’s where my expertise ends (not an engineer )
I wrecked an MS441C while changing the spark plus. I did not clean the area around the spark plug carefully enough, and the cylinder was scored, resulting in loss of compression. Sawdust was the culprit, though it may not have been just "fines".
I have only one complaint about it. When it has been idle a week or two, it tends to stall out after running for a second or two after starting. This can happen 2 or 3 times sometimes. My theory is that the microprocessor "forgets" where it operated before shutting down, and there may be a capacitor or something that supplies power to the system memory for a while. Once it has run for 5-10 seconds without stopping, I can shut it off and it starts again with one pull.Yeah im not saying you smashed the gap… I’m just saying all kinds of stuff can happen.
And you’re right that’s a damn good price for the 500
I’ll be really interested to see how you like the fuel injection especially after a year or two. I think about motorcycles and chainsaws as basically the same kinds of animals and when they rolled out fuel injection on 2-stroke KTMs I was racing in ~2018 it was *amazing* and even though it took them a few years to work out the bugs and it requires a computer to work on it it’s hard to argue with the results they are getting with them now..
I sadly must admit that fines were not the problem. The sawdust that was on the outside of the saw around the spark plug was unfiltered stuff, and I would guess some were more than 1/8" long. Though I brushed the area, I should have used compressed air to do a better job of cleaning. Expensive mistake on my part!Anecdotal evidence, but I think still worth the mention...
At my Echo Dealership, the Service Manager showed me a top end that had, what to me, seemed like an odd colour. I asked about it, and he said.. " It's from wood dust getting past the filter.: There was an odd "burnished" look.. a kind of light brown / tan colouration that I'd not seen before, I asked if that was why the saw was in pieces on the bench, and he said no.. The wood ingested, is burned up during normal combustion, and just resulted in some discolouration. Sawdust isn't capable of scratching metal in small quantities. Remember, the fines would be sucked into the combustion area, and burnt immediately to ash. Fines or ash, even if a very, very small percentage of them got stuck between the piston and the sleeve, would have minimal effect or consequences to the saw. They simply deposit, what is probably basically creosote on the piston dome, and on the top of the combustion chamber. That was the discolouration that let them know that the filter was letting stuff get through. That, and the presence of fines where they shouldn't have been in the induction area of the saw.
Are fines good for a saw? Uhhhh... no!! Do they cause catastrophic failure? I sincerely doubt it.
I just thought it was time to change the plug after about 10 years. The old plug did not look too bad, but once I had it out, I figured I might as well install the new plug. I did not take pictures, and neither did the dealer.We need to know a back story, like what caused you to change the plug?
Was the saw getting hard to start and you decided a new plug might be the answer?
Photos of the piston, old plug, new plug would be handy to back up your claims.
Enter your email address to join: