Register free!
Search
 
     

The Green Industry's Resource Center


Click for Weather
Reply
 
Thread Tools Display Modes
  #1  
Old 04-02-2002, 09:14 PM
Shady Brook's Avatar
Shady Brook Shady Brook is offline
LawnSite Bronze Member
 
Join Date: Aug 2001
Location: Indiana
Posts: 1,517
stihl FS 74

Anyone have any thoughts why an FS 74 will run, sort of on nearly full choke, but will die quickly if I let the choke out? She is smoking a great deal, in the viscinity of the muffler, and also around the head. Anyone know what minimum compression should be on this unit? I have changed out the carb, and exactly the same symptoms. Gas is not an issue, I am thinking it is bigger and more expensive things. Does this sound like the engine is on it's way out. Tons of black crud buildup in the exhaust area leading to the muffler.

Any thoughts are greatly welcome.

Thanks
Jay
Reply With Quote
  #2  
Old 04-02-2002, 10:02 PM
P&J Lawncare P&J Lawncare is offline
LawnSite Senior Member
 
Join Date: Jun 2001
Location: Oregon Ohio
Posts: 531
did you pull the screen out of your muffler if not it can build up with carbon fast.
Reply With Quote
  #3  
Old 04-02-2002, 10:30 PM
Shady Brook's Avatar
Shady Brook Shady Brook is offline
LawnSite Bronze Member
 
Join Date: Aug 2001
Location: Indiana
Posts: 1,517
screen is not an issue
Jay
Reply With Quote
  #4  
Old 04-03-2002, 03:54 AM
Fish's Avatar
Fish Fish is offline
LawnSite Member
 
Join Date: Feb 2001
Location: Lawrenceburg, KY
Posts: 139
Remove the muffler and look at the piston and
describe what you see.
Fish
Reply With Quote
  #5  
Old 04-03-2002, 02:07 PM
Shady Brook's Avatar
Shady Brook Shady Brook is offline
LawnSite Bronze Member
 
Join Date: Aug 2001
Location: Indiana
Posts: 1,517
Couple small abrasions on the piston's side. Piston does not receed all the way below exhaust port opening. Not sure what else to say.

Jay
Reply With Quote
  #6  
Old 04-03-2002, 04:04 PM
Fish's Avatar
Fish Fish is offline
LawnSite Member
 
Join Date: Feb 2001
Location: Lawrenceburg, KY
Posts: 139
Any piston scoring is bad, and the future for your
trimmer is bleak. Hate to say it, but your money would
be best spent buying a new one. If you buy the same
model, at least you will have one for parts. If you want
a different brand, look at Shindaiwa or Echo. Putting
in a new piston and/or cylinder would approach the
cost of a new one, and then still you would need to
find out what damaged the piston to begin with.
Fish
Reply With Quote
  #7  
Old 04-04-2002, 10:22 PM
khouse khouse is offline
LawnSite Bronze Member
 
Join Date: Feb 2001
Location: lee's summit, mo
Posts: 1,479
Fish is right. Sometimes you just have to get a new unit....
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump





Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ©1998 - 2012, LawnSite.comô - Moose River Media
All times are GMT -4. The time now is 07:30 PM.

Page generated in 0.09007 seconds with 7 queries