mt stx 38 blows white smoke and it will die after 5 to 10 secs later what is the problem with is thanks, richard
The number that you didn't list after the STX-** will tell you the width.
stx 38 fly wheel
bladebelt diagram for john deere stx38 yellow deck
http://imgshack.info/images/k9bxsdwcte1kup0mijg6.jpg
get a new spark plug
Remove the deck from the tractor, then remove both blades. They can be sharpened using a grinder. If you don't have a grinder, then there are shops out there that can sharpen them for you (try asking at a shop that sharpens chainsaw chains).
10w40 for the engine and hy-gard for the transmission.
Check out crigby's John Deere deck page. It shows the belt routings for most of the JD mowers. See the link below.
From everything I see the 125 is a 42" mower with a 20HP engine. The STX-38 mowers were 38" with either a 12.5 or a 13HP engine. So, yes the 125 is bigger than the STX-38.
The John Deere STX38 typically uses the same hood design as other models in the STX series, particularly the STX30 and STX46. However, due to variations in production and design changes, it's best to verify compatibility through the part number. For a precise fit, checking with a John Deere dealer or parts catalog is recommended.
This depends on the condition of the mower and also what country you live in.
my stx38 currently has a FRAM PH3614 on it. hope that helps you =)