If you're a dealer you should know that answer. If not ask around more.
Is scored on both sides, or the intake only?
Mainly on the exhaust side and a little on the intake side
That's pretty ugly. It lost lube or fuel. It does not appear to be straight gas.
I have a call into our rep also. I’m wondering if although they passed, if the injection valve or injector pump could malfunction and cause something like this.
They are backed up, 40 days out. Hoping to get some word this week.
Could it be from not getting the cylinder warmed up before going WOT? I think I saw one that they claimed was run hard from the start with no warm up and the piston expanded faster than the cylinder which caused it to scuff bad like that.
In the first example they list look at the piston where they say to differentiate between a lean seizure or straight gas.
Interesting about the scoring on the inside of the piston.
He should look to see how dry it is in general everywhere.
AKA as a cold seizure, reminds me of the old Dirt Bike days. Prob not in this case the computer indicated a lean condition, but it also might look like no oil, maybe a combination ?
Hand them a saw, expect to hear from them in 40 days, min.
Do a pressure/vacuum test on the saw. Also, pull all the data in the control module using the MDG1 and save it. If your pursuing a warranty claim Stihl is going to want that information. I’m dealing with the exact same situation on a low hour MS500i as we speak. In this case the customer was running a 36” bar cutting a stump and overheated the saw. Maybe the chain wasn’t as sharp as it should have been, maybe the fuel mix was a little leaner than it should have been, etc. there’s likely other factors that came into play, of course the customer said “I was cutting and the saw just stopped”.
