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Stihl 420C SEIZED UP!

proenterprises

LawnSite Silver Member
Location
Connecticut
My stihl br 420c magnum seized up today. Since one of the guys was running it, I dont have much to go on. I sensed that their was a little too much oil in the mix of this batch, and it was a different brand than the 2 cycle that I normally use (just had a bottle and wanted to get rid of it)

All I know is it stopped, and the starter rope is frozen. I dont have any idea how to fix, will probably bring it to the dealer Monday and get the bad news:realmad:

Anyone have insight?
 

geogunn

LawnSite Silver Member
Location
TN
befnme said:
too much oil wont make it seize up , only the lack of oil will .
agreed--that is if it is an oil related problem.

GEO
 

rodfather

LawnSite Fanatic
Location
Clinton, NJ
Probably a godsend lol...now you can get rid of that toy and get a Stihl 600 or an Redamx 8000 and make some real $$$ IMO:D
 

rodfather

LawnSite Fanatic
Location
Clinton, NJ
We've had to have 3 of or 4 8000's fixed with broken choke levers. They break and then close shutting the unit down.
 

Envy Lawn Service

LawnSite Fanatic
Location
North Carolina
How old is it?

I'm guessing an air leak type seizure... as air leaking in can lean out the mixture.
Old age, air leak or that's really some crappy oil.
 

Restrorob

LawnSite Fanatic
You can remove the muffler and look into the exhaust port with a flash light and tell if the cylinder or piston is scoured, This will tell you if it is blown or something else happened.
 

lawnmaniac883

LawnSite Silver Member
Location
largo, FL
Pull off the spark plug, put some PB blaster or some light weight engine oil, take a screwdriver, put in hole, tap with a hammer, this MAY unseize the unit.
 
OP
P

proenterprises

LawnSite Silver Member
Location
Connecticut
Well, Im sure some would say it was "crappy" oil. I had a bottle of that Supertech 2000 (walmart) around, and Just wanted to get rid of it. However, it has seen ECHO brand oil for every tank until now (last 3 years). I cant imagine that one time would kill an engine. ;)

Im just going to take it to my dealer on Monday. I do have to say, Stihl has really let me down on this one. I have never been happy with this unit, but when I bought it, I didnt know half of what I do now.

Anyone else had this problem/>?
 
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