stick a flat head screw driver in the slot above head and turn counter clock wise.
To change the head on a Stihl weedeater, first ensure the trimmer is turned off and disconnect the spark plug for safety. Use a wrench to remove the old cutting head by turning it counterclockwise. Align the new head with the spool, threading the line as per the manufacturer's instructions, and secure it in place by tightening it clockwise. Finally, reconnect the spark plug and you're ready to go.
sthilweedeaterhead number f5556
"i think its about 1 horsepower but it could depend on aplication." 25cc engines can range anywhere from 1-8hp depending on the carb, exhaust, head, piston, etc
The manual can be found at the link below.
remove head pull shaft out
There's either a steel or flexible shaft inside the tube between the engine and the head. That shaft is broken. Or if it's solid, it rusted inside the head
prie the blocker for the release line rate off, then just unscrew the bolt
On most of them you hold the top part with one hand and turn the bummer/spool clockwise (looking from the top)and pull it straight down/outward
It depends on your model. You can visit the PIVOTRIM website and they show how to install their head on most units which includes how to take your old one off. Their website is http://www.pivotrim.com Otherwise you need to look at your operators manual or call the manufacturer. Good Luck!
take your cylinder head off and change it.it is usually easyer to change the head
You need to call Pivotrim 1-866-212-7466. Apparently you need a different adapter (gray not black) to install on a FS-40.