[ferris hilton]

trimmer runs fine when cold, but when it has been running for 10-15 minutes it dies and won't start again.

 

[retrodog]

my 85 does the same thing, haven't had time to let the mech look at it.

 

[kjslawn]

Its most likely the coil I had to replace mine after 2yrs heavy use

 

[Roger]

Ditto on the ignition module suggestion. My FS85 exhibited the same problem, and a new module solved the problem.

 

[ferris hilton]

how would you check if it is the ignition module

 

[sawman65]

well you would have to get it hot then when it dies on ya be quick and check the spark. but you can count on one thing if a lot of people tell ya its the coil it gona be the coil. and i am telling ya also its the coil. big problem for the 80's/85's great line trimmers dont get me wrong, the BEST their ever was but weak in the coil.

opps i loked at you thread again. and you did not mention the model# but if its a 4-mix they also have problems with the coil as well.

 

[ferris hilton]

thanks i'll try that

 

[lawnboy dan]

typical sthil problem=pos

 

[lawnbutch]

typical stihl problem=pos

Ditto that!!!!! I trash canned mine and went with a different brand. The stihl 4mix is by far the worst!!!!!! IMO